Attachment 1450063 Details for Bug 1589382 – .ii file for testcase

.ii file for testcase

reproducer2.ii (text/plain), 707.03 KB, created by Serguei Makarov on 2018-06-11 14:22:53 UTC

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Filename:

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Creator: Serguei Makarov

Created: 2018-06-11 14:22:53 UTC

Size: 707.03 KB

patch

obsolete

># 1 "reproducer2.cxx"
># 1 "<built-in>"
># 1 "<command-line>"
># 1 "/usr/include/stdc-predef.h" 1 3 4
># 1 "<command-line>" 2
># 1 "reproducer2.cxx"
># 1 "/usr/include/c++/8/ext/stdio_filebuf.h" 1 3
># 32 "/usr/include/c++/8/ext/stdio_filebuf.h" 3
>       
># 33 "/usr/include/c++/8/ext/stdio_filebuf.h" 3
>
># 1 "/usr/include/c++/8/fstream" 1 3
># 36 "/usr/include/c++/8/fstream" 3
>       
># 37 "/usr/include/c++/8/fstream" 3
>
># 1 "/usr/include/c++/8/istream" 1 3
># 36 "/usr/include/c++/8/istream" 3
>       
># 37 "/usr/include/c++/8/istream" 3
>
># 1 "/usr/include/c++/8/ios" 1 3
># 36 "/usr/include/c++/8/ios" 3
>       
># 37 "/usr/include/c++/8/ios" 3
>
># 1 "/usr/include/c++/8/iosfwd" 1 3
># 36 "/usr/include/c++/8/iosfwd" 3
>       
># 37 "/usr/include/c++/8/iosfwd" 3
>
># 1 "/usr/include/c++/8/i686-redhat-linux/bits/c++config.h" 1 3
># 236 "/usr/include/c++/8/i686-redhat-linux/bits/c++config.h" 3
>
># 236 "/usr/include/c++/8/i686-redhat-linux/bits/c++config.h" 3
>namespace std
>{
>  typedef long unsigned int size_t;
>  typedef long int ptrdiff_t;
>
>
>  typedef decltype(nullptr) nullptr_t;
>
>}
># 258 "/usr/include/c++/8/i686-redhat-linux/bits/c++config.h" 3
>namespace std
>{
>  inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
>}
>namespace __gnu_cxx
>{
>  inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
>}
># 508 "/usr/include/c++/8/i686-redhat-linux/bits/c++config.h" 3
># 1 "/usr/include/c++/8/i686-redhat-linux/bits/os_defines.h" 1 3
># 39 "/usr/include/c++/8/i686-redhat-linux/bits/os_defines.h" 3
># 1 "/usr/include/features.h" 1 3 4
># 428 "/usr/include/features.h" 3 4
># 1 "/usr/include/sys/cdefs.h" 1 3 4
># 436 "/usr/include/sys/cdefs.h" 3 4
># 1 "/usr/include/bits/wordsize.h" 1 3 4
># 437 "/usr/include/sys/cdefs.h" 2 3 4
># 1 "/usr/include/bits/long-double.h" 1 3 4
># 438 "/usr/include/sys/cdefs.h" 2 3 4
># 429 "/usr/include/features.h" 2 3 4
># 452 "/usr/include/features.h" 3 4
># 1 "/usr/include/gnu/stubs.h" 1 3 4
># 10 "/usr/include/gnu/stubs.h" 3 4
># 1 "/usr/include/gnu/stubs-64.h" 1 3 4
># 11 "/usr/include/gnu/stubs.h" 2 3 4
># 453 "/usr/include/features.h" 2 3 4
># 40 "/usr/include/c++/8/i686-redhat-linux/bits/os_defines.h" 2 3
># 509 "/usr/include/c++/8/i686-redhat-linux/bits/c++config.h" 2 3
>
>
># 1 "/usr/include/c++/8/x86_64-redhat-linux/bits/cpu_defines.h" 1 3
># 512 "/usr/include/c++/8/i686-redhat-linux/bits/c++config.h" 2 3
># 39 "/usr/include/c++/8/iosfwd" 2 3
># 1 "/usr/include/c++/8/bits/stringfwd.h" 1 3
># 37 "/usr/include/c++/8/bits/stringfwd.h" 3
>       
># 38 "/usr/include/c++/8/bits/stringfwd.h" 3
>
>
># 1 "/usr/include/c++/8/bits/memoryfwd.h" 1 3
># 46 "/usr/include/c++/8/bits/memoryfwd.h" 3
>       
># 47 "/usr/include/c++/8/bits/memoryfwd.h" 3
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 63 "/usr/include/c++/8/bits/memoryfwd.h" 3
>  template<typename>
>    class allocator;
>
>  template<>
>    class allocator<void>;
>
>
>  template<typename, typename>
>    struct uses_allocator;
>
>
>
>
>}
># 41 "/usr/include/c++/8/bits/stringfwd.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>
>
>
>
>  template<class _CharT>
>    struct char_traits;
>
>  template<> struct char_traits<char>;
>
>
>  template<> struct char_traits<wchar_t>;
>
>
>
>
>  template<> struct char_traits<char16_t>;
>  template<> struct char_traits<char32_t>;
>
>
>namespace __cxx11 {
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT>,
>           typename _Alloc = allocator<_CharT> >
>    class basic_string;
>
>
>  typedef basic_string<char> string;
>
>
>
>  typedef basic_string<wchar_t> wstring;
>
>
>
>
>
>  typedef basic_string<char16_t> u16string;
>
>
>  typedef basic_string<char32_t> u32string;
>
>
>}
>
>
>
>
>}
># 40 "/usr/include/c++/8/iosfwd" 2 3
># 1 "/usr/include/c++/8/bits/postypes.h" 1 3
># 38 "/usr/include/c++/8/bits/postypes.h" 3
>       
># 39 "/usr/include/c++/8/bits/postypes.h" 3
>
># 1 "/usr/include/c++/8/cwchar" 1 3
># 39 "/usr/include/c++/8/cwchar" 3
>       
># 40 "/usr/include/c++/8/cwchar" 3
>
>
>
>
># 1 "/usr/include/wchar.h" 1 3 4
># 27 "/usr/include/wchar.h" 3 4
># 1 "/usr/include/bits/libc-header-start.h" 1 3 4
># 28 "/usr/include/wchar.h" 2 3 4
>
>
># 1 "/usr/include/bits/floatn.h" 1 3 4
># 74 "/usr/include/bits/floatn.h" 3 4
>typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__)));
># 86 "/usr/include/bits/floatn.h" 3 4
>typedef __float128 _Float128;
># 119 "/usr/include/bits/floatn.h" 3 4
># 1 "/usr/include/bits/floatn-common.h" 1 3 4
># 24 "/usr/include/bits/floatn-common.h" 3 4
># 1 "/usr/include/bits/long-double.h" 1 3 4
># 25 "/usr/include/bits/floatn-common.h" 2 3 4
># 214 "/usr/include/bits/floatn-common.h" 3 4
>typedef float _Float32;
># 251 "/usr/include/bits/floatn-common.h" 3 4
>typedef double _Float64;
># 268 "/usr/include/bits/floatn-common.h" 3 4
>typedef double _Float32x;
># 285 "/usr/include/bits/floatn-common.h" 3 4
>typedef long double _Float64x;
># 120 "/usr/include/bits/floatn.h" 2 3 4
># 31 "/usr/include/wchar.h" 2 3 4
>
>
>
>
># 1 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 1 3 4
># 216 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 3 4
>typedef long unsigned int size_t;
># 36 "/usr/include/wchar.h" 2 3 4
>
>
># 1 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stdarg.h" 1 3 4
># 40 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stdarg.h" 3 4
>typedef __builtin_va_list __gnuc_va_list;
># 39 "/usr/include/wchar.h" 2 3 4
>
># 1 "/usr/include/bits/wchar.h" 1 3 4
># 41 "/usr/include/wchar.h" 2 3 4
># 1 "/usr/include/bits/types/wint_t.h" 1 3 4
># 20 "/usr/include/bits/types/wint_t.h" 3 4
>typedef unsigned int wint_t;
># 42 "/usr/include/wchar.h" 2 3 4
># 1 "/usr/include/bits/types/mbstate_t.h" 1 3 4
>
>
>
># 1 "/usr/include/bits/types/__mbstate_t.h" 1 3 4
># 13 "/usr/include/bits/types/__mbstate_t.h" 3 4
>typedef struct
>{
>  int __count;
>  union
>  {
>    unsigned int __wch;
>    char __wchb[4];
>  } __value;
>} __mbstate_t;
># 5 "/usr/include/bits/types/mbstate_t.h" 2 3 4
>
>typedef __mbstate_t mbstate_t;
># 43 "/usr/include/wchar.h" 2 3 4
># 1 "/usr/include/bits/types/__FILE.h" 1 3 4
>
>
>
>struct _IO_FILE;
>typedef struct _IO_FILE __FILE;
># 44 "/usr/include/wchar.h" 2 3 4
>
>
># 1 "/usr/include/bits/types/FILE.h" 1 3 4
>
>
>
>struct _IO_FILE;
>
>
>typedef struct _IO_FILE FILE;
># 47 "/usr/include/wchar.h" 2 3 4
>
>
># 1 "/usr/include/bits/types/locale_t.h" 1 3 4
># 22 "/usr/include/bits/types/locale_t.h" 3 4
># 1 "/usr/include/bits/types/__locale_t.h" 1 3 4
># 28 "/usr/include/bits/types/__locale_t.h" 3 4
>struct __locale_struct
>{
>
>  struct __locale_data *__locales[13];
>
>
>  const unsigned short int *__ctype_b;
>  const int *__ctype_tolower;
>  const int *__ctype_toupper;
>
>
>  const char *__names[13];
>};
>
>typedef struct __locale_struct *__locale_t;
># 23 "/usr/include/bits/types/locale_t.h" 2 3 4
>
>typedef __locale_t locale_t;
># 50 "/usr/include/wchar.h" 2 3 4
># 79 "/usr/include/wchar.h" 3 4
>extern "C" {
>
>
>
>struct tm;
>
>
>
>extern wchar_t *wcscpy (wchar_t *__restrict __dest,
>   const wchar_t *__restrict __src)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern wchar_t *wcsncpy (wchar_t *__restrict __dest,
>    const wchar_t *__restrict __src, size_t __n)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern wchar_t *wcscat (wchar_t *__restrict __dest,
>   const wchar_t *__restrict __src)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>extern wchar_t *wcsncat (wchar_t *__restrict __dest,
>    const wchar_t *__restrict __src, size_t __n)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int wcscmp (const wchar_t *__s1, const wchar_t *__s2)
>     throw () __attribute__ ((__pure__)) __attribute__ ((__nonnull__ (1, 2)));
>
>extern int wcsncmp (const wchar_t *__s1, const wchar_t *__s2, size_t __n)
>     throw () __attribute__ ((__pure__)) __attribute__ ((__nonnull__ (1, 2)));
>
>
>
>extern int wcscasecmp (const wchar_t *__s1, const wchar_t *__s2) throw ();
>
>
>extern int wcsncasecmp (const wchar_t *__s1, const wchar_t *__s2,
>   size_t __n) throw ();
>
>
>
>extern int wcscasecmp_l (const wchar_t *__s1, const wchar_t *__s2,
>    locale_t __loc) throw ();
>
>extern int wcsncasecmp_l (const wchar_t *__s1, const wchar_t *__s2,
>     size_t __n, locale_t __loc) throw ();
>
>
>
>
>extern int wcscoll (const wchar_t *__s1, const wchar_t *__s2) throw ();
>
>
>
>extern size_t wcsxfrm (wchar_t *__restrict __s1,
>         const wchar_t *__restrict __s2, size_t __n) throw ();
>
>
>
>
>
>
>
>extern int wcscoll_l (const wchar_t *__s1, const wchar_t *__s2,
>        locale_t __loc) throw ();
>
>
>
>
>extern size_t wcsxfrm_l (wchar_t *__s1, const wchar_t *__s2,
>    size_t __n, locale_t __loc) throw ();
>
>
>extern wchar_t *wcsdup (const wchar_t *__s) throw () __attribute__ ((__malloc__));
>
>
>
>
>extern "C++" wchar_t *wcschr (wchar_t *__wcs, wchar_t __wc)
>     throw () __asm ("wcschr") __attribute__ ((__pure__));
>extern "C++" const wchar_t *wcschr (const wchar_t *__wcs, wchar_t __wc)
>     throw () __asm ("wcschr") __attribute__ ((__pure__));
>
>
>
>
>
>
>extern "C++" wchar_t *wcsrchr (wchar_t *__wcs, wchar_t __wc)
>     throw () __asm ("wcsrchr") __attribute__ ((__pure__));
>extern "C++" const wchar_t *wcsrchr (const wchar_t *__wcs, wchar_t __wc)
>     throw () __asm ("wcsrchr") __attribute__ ((__pure__));
># 181 "/usr/include/wchar.h" 3 4
>extern wchar_t *wcschrnul (const wchar_t *__s, wchar_t __wc)
>     throw () __attribute__ ((__pure__));
>
>
>
>
>extern size_t wcscspn (const wchar_t *__wcs, const wchar_t *__reject)
>     throw () __attribute__ ((__pure__));
>
>
>extern size_t wcsspn (const wchar_t *__wcs, const wchar_t *__accept)
>     throw () __attribute__ ((__pure__));
>
>
>extern "C++" wchar_t *wcspbrk (wchar_t *__wcs, const wchar_t *__accept)
>     throw () __asm ("wcspbrk") __attribute__ ((__pure__));
>extern "C++" const wchar_t *wcspbrk (const wchar_t *__wcs,
>         const wchar_t *__accept)
>     throw () __asm ("wcspbrk") __attribute__ ((__pure__));
>
>
>
>
>
>
>extern "C++" wchar_t *wcsstr (wchar_t *__haystack, const wchar_t *__needle)
>     throw () __asm ("wcsstr") __attribute__ ((__pure__));
>extern "C++" const wchar_t *wcsstr (const wchar_t *__haystack,
>        const wchar_t *__needle)
>     throw () __asm ("wcsstr") __attribute__ ((__pure__));
>
>
>
>
>
>
>extern wchar_t *wcstok (wchar_t *__restrict __s,
>   const wchar_t *__restrict __delim,
>   wchar_t **__restrict __ptr) throw ();
>
>
>extern size_t wcslen (const wchar_t *__s) throw () __attribute__ ((__pure__));
>
>
>
>
>extern "C++" wchar_t *wcswcs (wchar_t *__haystack, const wchar_t *__needle)
>     throw () __asm ("wcswcs") __attribute__ ((__pure__));
>extern "C++" const wchar_t *wcswcs (const wchar_t *__haystack,
>        const wchar_t *__needle)
>     throw () __asm ("wcswcs") __attribute__ ((__pure__));
># 240 "/usr/include/wchar.h" 3 4
>extern size_t wcsnlen (const wchar_t *__s, size_t __maxlen)
>     throw () __attribute__ ((__pure__));
>
>
>
>
>
>extern "C++" wchar_t *wmemchr (wchar_t *__s, wchar_t __c, size_t __n)
>     throw () __asm ("wmemchr") __attribute__ ((__pure__));
>extern "C++" const wchar_t *wmemchr (const wchar_t *__s, wchar_t __c,
>         size_t __n)
>     throw () __asm ("wmemchr") __attribute__ ((__pure__));
>
>
>
>
>
>
>extern int wmemcmp (const wchar_t *__s1, const wchar_t *__s2, size_t __n)
>     throw () __attribute__ ((__pure__));
>
>
>extern wchar_t *wmemcpy (wchar_t *__restrict __s1,
>    const wchar_t *__restrict __s2, size_t __n) throw ();
>
>
>
>extern wchar_t *wmemmove (wchar_t *__s1, const wchar_t *__s2, size_t __n)
>     throw ();
>
>
>extern wchar_t *wmemset (wchar_t *__s, wchar_t __c, size_t __n) throw ();
>
>
>
>
>extern wchar_t *wmempcpy (wchar_t *__restrict __s1,
>     const wchar_t *__restrict __s2, size_t __n)
>     throw ();
>
>
>
>
>
>extern wint_t btowc (int __c) throw ();
>
>
>
>extern int wctob (wint_t __c) throw ();
>
>
>
>extern int mbsinit (const mbstate_t *__ps) throw () __attribute__ ((__pure__));
>
>
>
>extern size_t mbrtowc (wchar_t *__restrict __pwc,
>         const char *__restrict __s, size_t __n,
>         mbstate_t *__restrict __p) throw ();
>
>
>extern size_t wcrtomb (char *__restrict __s, wchar_t __wc,
>         mbstate_t *__restrict __ps) throw ();
>
>
>extern size_t __mbrlen (const char *__restrict __s, size_t __n,
>   mbstate_t *__restrict __ps) throw ();
>extern size_t mbrlen (const char *__restrict __s, size_t __n,
>        mbstate_t *__restrict __ps) throw ();
># 337 "/usr/include/wchar.h" 3 4
>extern size_t mbsrtowcs (wchar_t *__restrict __dst,
>    const char **__restrict __src, size_t __len,
>    mbstate_t *__restrict __ps) throw ();
>
>
>
>extern size_t wcsrtombs (char *__restrict __dst,
>    const wchar_t **__restrict __src, size_t __len,
>    mbstate_t *__restrict __ps) throw ();
>
>
>
>
>
>extern size_t mbsnrtowcs (wchar_t *__restrict __dst,
>     const char **__restrict __src, size_t __nmc,
>     size_t __len, mbstate_t *__restrict __ps) throw ();
>
>
>
>extern size_t wcsnrtombs (char *__restrict __dst,
>     const wchar_t **__restrict __src,
>     size_t __nwc, size_t __len,
>     mbstate_t *__restrict __ps) throw ();
>
>
>
>
>
>
>extern int wcwidth (wchar_t __c) throw ();
>
>
>
>extern int wcswidth (const wchar_t *__s, size_t __n) throw ();
>
>
>
>
>
>extern double wcstod (const wchar_t *__restrict __nptr,
>        wchar_t **__restrict __endptr) throw ();
>
>
>
>extern float wcstof (const wchar_t *__restrict __nptr,
>       wchar_t **__restrict __endptr) throw ();
>extern long double wcstold (const wchar_t *__restrict __nptr,
>       wchar_t **__restrict __endptr) throw ();
># 396 "/usr/include/wchar.h" 3 4
>extern _Float32 wcstof32 (const wchar_t *__restrict __nptr,
>     wchar_t **__restrict __endptr) throw ();
>
>
>
>extern _Float64 wcstof64 (const wchar_t *__restrict __nptr,
>     wchar_t **__restrict __endptr) throw ();
>
>
>
>extern _Float128 wcstof128 (const wchar_t *__restrict __nptr,
>       wchar_t **__restrict __endptr) throw ();
>
>
>
>extern _Float32x wcstof32x (const wchar_t *__restrict __nptr,
>       wchar_t **__restrict __endptr) throw ();
>
>
>
>extern _Float64x wcstof64x (const wchar_t *__restrict __nptr,
>       wchar_t **__restrict __endptr) throw ();
># 428 "/usr/include/wchar.h" 3 4
>extern long int wcstol (const wchar_t *__restrict __nptr,
>   wchar_t **__restrict __endptr, int __base) throw ();
>
>
>
>extern unsigned long int wcstoul (const wchar_t *__restrict __nptr,
>      wchar_t **__restrict __endptr, int __base)
>     throw ();
>
>
>
>
>__extension__
>extern long long int wcstoll (const wchar_t *__restrict __nptr,
>         wchar_t **__restrict __endptr, int __base)
>     throw ();
>
>
>
>__extension__
>extern unsigned long long int wcstoull (const wchar_t *__restrict __nptr,
>     wchar_t **__restrict __endptr,
>     int __base) throw ();
>
>
>
>
>
>__extension__
>extern long long int wcstoq (const wchar_t *__restrict __nptr,
>        wchar_t **__restrict __endptr, int __base)
>     throw ();
>
>
>
>__extension__
>extern unsigned long long int wcstouq (const wchar_t *__restrict __nptr,
>           wchar_t **__restrict __endptr,
>           int __base) throw ();
>
>
>
>
>
>
>extern long int wcstol_l (const wchar_t *__restrict __nptr,
>     wchar_t **__restrict __endptr, int __base,
>     locale_t __loc) throw ();
>
>extern unsigned long int wcstoul_l (const wchar_t *__restrict __nptr,
>        wchar_t **__restrict __endptr,
>        int __base, locale_t __loc) throw ();
>
>__extension__
>extern long long int wcstoll_l (const wchar_t *__restrict __nptr,
>    wchar_t **__restrict __endptr,
>    int __base, locale_t __loc) throw ();
>
>__extension__
>extern unsigned long long int wcstoull_l (const wchar_t *__restrict __nptr,
>       wchar_t **__restrict __endptr,
>       int __base, locale_t __loc)
>     throw ();
>
>extern double wcstod_l (const wchar_t *__restrict __nptr,
>   wchar_t **__restrict __endptr, locale_t __loc)
>     throw ();
>
>extern float wcstof_l (const wchar_t *__restrict __nptr,
>         wchar_t **__restrict __endptr, locale_t __loc)
>     throw ();
>
>extern long double wcstold_l (const wchar_t *__restrict __nptr,
>         wchar_t **__restrict __endptr,
>         locale_t __loc) throw ();
># 511 "/usr/include/wchar.h" 3 4
>extern _Float32 wcstof32_l (const wchar_t *__restrict __nptr,
>       wchar_t **__restrict __endptr,
>       locale_t __loc) throw ();
>
>
>
>extern _Float64 wcstof64_l (const wchar_t *__restrict __nptr,
>       wchar_t **__restrict __endptr,
>       locale_t __loc) throw ();
>
>
>
>extern _Float128 wcstof128_l (const wchar_t *__restrict __nptr,
>         wchar_t **__restrict __endptr,
>         locale_t __loc) throw ();
>
>
>
>extern _Float32x wcstof32x_l (const wchar_t *__restrict __nptr,
>         wchar_t **__restrict __endptr,
>         locale_t __loc) throw ();
>
>
>
>extern _Float64x wcstof64x_l (const wchar_t *__restrict __nptr,
>         wchar_t **__restrict __endptr,
>         locale_t __loc) throw ();
># 551 "/usr/include/wchar.h" 3 4
>extern wchar_t *wcpcpy (wchar_t *__restrict __dest,
>   const wchar_t *__restrict __src) throw ();
>
>
>
>extern wchar_t *wcpncpy (wchar_t *__restrict __dest,
>    const wchar_t *__restrict __src, size_t __n)
>     throw ();
># 567 "/usr/include/wchar.h" 3 4
>extern __FILE *open_wmemstream (wchar_t **__bufloc, size_t *__sizeloc) throw ();
>
>
>
>
>
>extern int fwide (__FILE *__fp, int __mode) throw ();
>
>
>
>
>
>
>extern int fwprintf (__FILE *__restrict __stream,
>       const wchar_t *__restrict __format, ...)
>                                                           ;
>
>
>
>
>extern int wprintf (const wchar_t *__restrict __format, ...)
>                                                           ;
>
>extern int swprintf (wchar_t *__restrict __s, size_t __n,
>       const wchar_t *__restrict __format, ...)
>     throw () ;
>
>
>
>
>
>extern int vfwprintf (__FILE *__restrict __s,
>        const wchar_t *__restrict __format,
>        __gnuc_va_list __arg)
>                                                           ;
>
>
>
>
>extern int vwprintf (const wchar_t *__restrict __format,
>       __gnuc_va_list __arg)
>                                                           ;
>
>
>extern int vswprintf (wchar_t *__restrict __s, size_t __n,
>        const wchar_t *__restrict __format,
>        __gnuc_va_list __arg)
>     throw () ;
>
>
>
>
>
>
>extern int fwscanf (__FILE *__restrict __stream,
>      const wchar_t *__restrict __format, ...)
>                                                          ;
>
>
>
>
>extern int wscanf (const wchar_t *__restrict __format, ...)
>                                                          ;
>
>extern int swscanf (const wchar_t *__restrict __s,
>      const wchar_t *__restrict __format, ...)
>     throw () ;
># 673 "/usr/include/wchar.h" 3 4
>extern int vfwscanf (__FILE *__restrict __s,
>       const wchar_t *__restrict __format,
>       __gnuc_va_list __arg)
>                                                          ;
>
>
>
>
>extern int vwscanf (const wchar_t *__restrict __format,
>      __gnuc_va_list __arg)
>                                                          ;
>
>extern int vswscanf (const wchar_t *__restrict __s,
>       const wchar_t *__restrict __format,
>       __gnuc_va_list __arg)
>     throw () ;
># 727 "/usr/include/wchar.h" 3 4
>extern wint_t fgetwc (__FILE *__stream);
>extern wint_t getwc (__FILE *__stream);
>
>
>
>
>
>extern wint_t getwchar (void);
>
>
>
>
>
>
>extern wint_t fputwc (wchar_t __wc, __FILE *__stream);
>extern wint_t putwc (wchar_t __wc, __FILE *__stream);
>
>
>
>
>
>extern wint_t putwchar (wchar_t __wc);
>
>
>
>
>
>
>
>extern wchar_t *fgetws (wchar_t *__restrict __ws, int __n,
>   __FILE *__restrict __stream);
>
>
>
>
>
>extern int fputws (const wchar_t *__restrict __ws,
>     __FILE *__restrict __stream);
>
>
>
>
>
>
>extern wint_t ungetwc (wint_t __wc, __FILE *__stream);
># 782 "/usr/include/wchar.h" 3 4
>extern wint_t getwc_unlocked (__FILE *__stream);
>extern wint_t getwchar_unlocked (void);
>
>
>
>
>
>
>
>extern wint_t fgetwc_unlocked (__FILE *__stream);
>
>
>
>
>
>
>
>extern wint_t fputwc_unlocked (wchar_t __wc, __FILE *__stream);
># 808 "/usr/include/wchar.h" 3 4
>extern wint_t putwc_unlocked (wchar_t __wc, __FILE *__stream);
>extern wint_t putwchar_unlocked (wchar_t __wc);
># 818 "/usr/include/wchar.h" 3 4
>extern wchar_t *fgetws_unlocked (wchar_t *__restrict __ws, int __n,
>     __FILE *__restrict __stream);
>
>
>
>
>
>
>
>extern int fputws_unlocked (const wchar_t *__restrict __ws,
>       __FILE *__restrict __stream);
>
>
>
>
>
>
>extern size_t wcsftime (wchar_t *__restrict __s, size_t __maxsize,
>   const wchar_t *__restrict __format,
>   const struct tm *__restrict __tp) throw ();
>
>
>
>
>extern size_t wcsftime_l (wchar_t *__restrict __s, size_t __maxsize,
>     const wchar_t *__restrict __format,
>     const struct tm *__restrict __tp,
>     locale_t __loc) throw ();
># 857 "/usr/include/wchar.h" 3 4
>}
># 45 "/usr/include/c++/8/cwchar" 2 3
># 62 "/usr/include/c++/8/cwchar" 3
>namespace std
>{
>  using ::mbstate_t;
>}
># 135 "/usr/include/c++/8/cwchar" 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  using ::wint_t;
>
>  using ::btowc;
>  using ::fgetwc;
>  using ::fgetws;
>  using ::fputwc;
>  using ::fputws;
>  using ::fwide;
>  using ::fwprintf;
>  using ::fwscanf;
>  using ::getwc;
>  using ::getwchar;
>  using ::mbrlen;
>  using ::mbrtowc;
>  using ::mbsinit;
>  using ::mbsrtowcs;
>  using ::putwc;
>  using ::putwchar;
>
>  using ::swprintf;
>
>  using ::swscanf;
>  using ::ungetwc;
>  using ::vfwprintf;
>
>  using ::vfwscanf;
>
>
>  using ::vswprintf;
>
>
>  using ::vswscanf;
>
>  using ::vwprintf;
>
>  using ::vwscanf;
>
>  using ::wcrtomb;
>  using ::wcscat;
>  using ::wcscmp;
>  using ::wcscoll;
>  using ::wcscpy;
>  using ::wcscspn;
>  using ::wcsftime;
>  using ::wcslen;
>  using ::wcsncat;
>  using ::wcsncmp;
>  using ::wcsncpy;
>  using ::wcsrtombs;
>  using ::wcsspn;
>  using ::wcstod;
>
>  using ::wcstof;
>
>  using ::wcstok;
>  using ::wcstol;
>  using ::wcstoul;
>  using ::wcsxfrm;
>  using ::wctob;
>  using ::wmemcmp;
>  using ::wmemcpy;
>  using ::wmemmove;
>  using ::wmemset;
>  using ::wprintf;
>  using ::wscanf;
>  using ::wcschr;
>  using ::wcspbrk;
>  using ::wcsrchr;
>  using ::wcsstr;
>  using ::wmemchr;
># 232 "/usr/include/c++/8/cwchar" 3
>
>}
>
>
>
>
>
>
>
>namespace __gnu_cxx
>{
>
>
>
>
>
>  using ::wcstold;
># 257 "/usr/include/c++/8/cwchar" 3
>  using ::wcstoll;
>  using ::wcstoull;
>
>}
>
>namespace std
>{
>  using ::__gnu_cxx::wcstold;
>  using ::__gnu_cxx::wcstoll;
>  using ::__gnu_cxx::wcstoull;
>}
># 277 "/usr/include/c++/8/cwchar" 3
>namespace std
>{
>
>  using std::wcstof;
>
>
>  using std::vfwscanf;
>
>
>  using std::vswscanf;
>
>
>  using std::vwscanf;
>
>
>
>  using std::wcstold;
>  using std::wcstoll;
>  using std::wcstoull;
>
>}
># 41 "/usr/include/c++/8/bits/postypes.h" 2 3
># 68 "/usr/include/c++/8/bits/postypes.h" 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 90 "/usr/include/c++/8/bits/postypes.h" 3
>  typedef long long streamoff;
>
>
>
>
>
>
>
>  typedef ptrdiff_t streamsize;
># 111 "/usr/include/c++/8/bits/postypes.h" 3
>  template<typename _StateT>
>    class fpos
>    {
>    private:
>      streamoff _M_off;
>      _StateT _M_state;
>
>    public:
>
>
>
>
>      fpos()
>      : _M_off(0), _M_state() { }
># 133 "/usr/include/c++/8/bits/postypes.h" 3
>      fpos(streamoff __off)
>      : _M_off(__off), _M_state() { }
>
>
>      operator streamoff() const { return _M_off; }
>
>
>      void
>      state(_StateT __st)
>      { _M_state = __st; }
>
>
>      _StateT
>      state() const
>      { return _M_state; }
>
>
>
>
>
>      fpos&
>      operator+=(streamoff __off)
>      {
> _M_off += __off;
> return *this;
>      }
>
>
>
>
>
>      fpos&
>      operator-=(streamoff __off)
>      {
> _M_off -= __off;
> return *this;
>      }
>
>
>
>
>
>
>
>      fpos
>      operator+(streamoff __off) const
>      {
> fpos __pos(*this);
> __pos += __off;
> return __pos;
>      }
>
>
>
>
>
>
>
>      fpos
>      operator-(streamoff __off) const
>      {
> fpos __pos(*this);
> __pos -= __off;
> return __pos;
>      }
>
>
>
>
>
>
>      streamoff
>      operator-(const fpos& __other) const
>      { return _M_off - __other._M_off; }
>    };
>
>
>
>
>
>
>  template<typename _StateT>
>    inline bool
>    operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
>    { return streamoff(__lhs) == streamoff(__rhs); }
>
>  template<typename _StateT>
>    inline bool
>    operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
>    { return streamoff(__lhs) != streamoff(__rhs); }
>
>
>
>
>
>  typedef fpos<mbstate_t> streampos;
>
>  typedef fpos<mbstate_t> wstreampos;
>
>
>
>  typedef fpos<mbstate_t> u16streampos;
>
>  typedef fpos<mbstate_t> u32streampos;
>
>
>
>}
># 41 "/usr/include/c++/8/iosfwd" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 74 "/usr/include/c++/8/iosfwd" 3
>  class ios_base;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT> >
>    class basic_ios;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT> >
>    class basic_streambuf;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT> >
>    class basic_istream;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT> >
>    class basic_ostream;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT> >
>    class basic_iostream;
>
>
>namespace __cxx11 {
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT>,
>     typename _Alloc = allocator<_CharT> >
>    class basic_stringbuf;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT>,
>    typename _Alloc = allocator<_CharT> >
>    class basic_istringstream;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT>,
>    typename _Alloc = allocator<_CharT> >
>    class basic_ostringstream;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT>,
>    typename _Alloc = allocator<_CharT> >
>    class basic_stringstream;
>
>}
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT> >
>    class basic_filebuf;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT> >
>    class basic_ifstream;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT> >
>    class basic_ofstream;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT> >
>    class basic_fstream;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT> >
>    class istreambuf_iterator;
>
>  template<typename _CharT, typename _Traits = char_traits<_CharT> >
>    class ostreambuf_iterator;
>
>
>
>  typedef basic_ios<char> ios;
>
>
>  typedef basic_streambuf<char> streambuf;
>
>
>  typedef basic_istream<char> istream;
>
>
>  typedef basic_ostream<char> ostream;
>
>
>  typedef basic_iostream<char> iostream;
>
>
>  typedef basic_stringbuf<char> stringbuf;
>
>
>  typedef basic_istringstream<char> istringstream;
>
>
>  typedef basic_ostringstream<char> ostringstream;
>
>
>  typedef basic_stringstream<char> stringstream;
>
>
>  typedef basic_filebuf<char> filebuf;
>
>
>  typedef basic_ifstream<char> ifstream;
>
>
>  typedef basic_ofstream<char> ofstream;
>
>
>  typedef basic_fstream<char> fstream;
>
>
>
>  typedef basic_ios<wchar_t> wios;
>
>
>  typedef basic_streambuf<wchar_t> wstreambuf;
>
>
>  typedef basic_istream<wchar_t> wistream;
>
>
>  typedef basic_ostream<wchar_t> wostream;
>
>
>  typedef basic_iostream<wchar_t> wiostream;
>
>
>  typedef basic_stringbuf<wchar_t> wstringbuf;
>
>
>  typedef basic_istringstream<wchar_t> wistringstream;
>
>
>  typedef basic_ostringstream<wchar_t> wostringstream;
>
>
>  typedef basic_stringstream<wchar_t> wstringstream;
>
>
>  typedef basic_filebuf<wchar_t> wfilebuf;
>
>
>  typedef basic_ifstream<wchar_t> wifstream;
>
>
>  typedef basic_ofstream<wchar_t> wofstream;
>
>
>  typedef basic_fstream<wchar_t> wfstream;
>
>
>
>
>}
># 39 "/usr/include/c++/8/ios" 2 3
># 1 "/usr/include/c++/8/exception" 1 3
># 33 "/usr/include/c++/8/exception" 3
>       
># 34 "/usr/include/c++/8/exception" 3
>
>#pragma GCC visibility push(default)
>
>
># 1 "/usr/include/c++/8/bits/exception.h" 1 3
># 34 "/usr/include/c++/8/bits/exception.h" 3
>       
># 35 "/usr/include/c++/8/bits/exception.h" 3
>
>#pragma GCC visibility push(default)
>
>
>
>extern "C++" {
>
>namespace std
>{
># 60 "/usr/include/c++/8/bits/exception.h" 3
>  class exception
>  {
>  public:
>    exception() noexcept { }
>    virtual ~exception() noexcept;
>
>
>
>    virtual const char*
>    what() const noexcept;
>  };
>
>}
>
>}
>
>#pragma GCC visibility pop
># 39 "/usr/include/c++/8/exception" 2 3
>
>extern "C++" {
>
>namespace std
>{
>
>
>  class bad_exception : public exception
>  {
>  public:
>    bad_exception() noexcept { }
>
>
>
>    virtual ~bad_exception() noexcept;
>
>
>    virtual const char*
>    what() const noexcept;
>  };
>
>
>  typedef void (*terminate_handler) ();
>
>
>  typedef void (*unexpected_handler) ();
>
>
>  terminate_handler set_terminate(terminate_handler) noexcept;
>
>
>
>  terminate_handler get_terminate() noexcept;
>
>
>
>
>  void terminate() noexcept __attribute__ ((__noreturn__));
>
>
>  unexpected_handler set_unexpected(unexpected_handler) noexcept;
>
>
>
>  unexpected_handler get_unexpected() noexcept;
>
>
>
>
>  void unexpected() __attribute__ ((__noreturn__));
># 101 "/usr/include/c++/8/exception" 3
> 
>  bool uncaught_exception() noexcept __attribute__ ((__pure__));
>
>
>
>
>  int uncaught_exceptions() noexcept __attribute__ ((__pure__));
>
>
>
>}
>
>namespace __gnu_cxx
>{
>
># 133 "/usr/include/c++/8/exception" 3
>  void __verbose_terminate_handler();
>
>
>}
>
>}
>
>#pragma GCC visibility pop
>
>
># 1 "/usr/include/c++/8/bits/exception_ptr.h" 1 3
># 34 "/usr/include/c++/8/bits/exception_ptr.h" 3
>#pragma GCC visibility push(default)
>
>
># 1 "/usr/include/c++/8/bits/exception_defines.h" 1 3
># 38 "/usr/include/c++/8/bits/exception_ptr.h" 2 3
># 1 "/usr/include/c++/8/bits/cxxabi_init_exception.h" 1 3
># 34 "/usr/include/c++/8/bits/cxxabi_init_exception.h" 3
>       
># 35 "/usr/include/c++/8/bits/cxxabi_init_exception.h" 3
>
>#pragma GCC visibility push(default)
>
># 1 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 1 3 4
># 149 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 3 4
>typedef long int ptrdiff_t;
># 426 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 3 4
>typedef struct {
>  long long __max_align_ll __attribute__((__aligned__(__alignof__(long long))));
>  long double __max_align_ld __attribute__((__aligned__(__alignof__(long double))));
># 437 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 3 4
>} max_align_t;
>
>
>
>
>
>
>  typedef decltype(nullptr) nullptr_t;
># 39 "/usr/include/c++/8/bits/cxxabi_init_exception.h" 2 3
># 50 "/usr/include/c++/8/bits/cxxabi_init_exception.h" 3
>namespace std
>{
>  class type_info;
>}
>
>namespace __cxxabiv1
>{
>  struct __cxa_refcounted_exception;
>
>  extern "C"
>    {
>
>      void*
>      __cxa_allocate_exception(size_t) noexcept;
>
>
>      __cxa_refcounted_exception*
>      __cxa_init_primary_exception(void *object, std::type_info *tinfo,
>                void ( *dest) (void *)) noexcept;
>
>    }
>}
>
>
>
>#pragma GCC visibility pop
># 39 "/usr/include/c++/8/bits/exception_ptr.h" 2 3
># 1 "/usr/include/c++/8/typeinfo" 1 3
># 32 "/usr/include/c++/8/typeinfo" 3
>       
># 33 "/usr/include/c++/8/typeinfo" 3
>
>
>
># 1 "/usr/include/c++/8/bits/hash_bytes.h" 1 3
># 33 "/usr/include/c++/8/bits/hash_bytes.h" 3
>       
># 34 "/usr/include/c++/8/bits/hash_bytes.h" 3
>
>
>
>namespace std
>{
>
>
>
>
>
>
>
>  size_t
>  _Hash_bytes(const void* __ptr, size_t __len, size_t __seed);
>
>
>
>
>
>  size_t
>  _Fnv_hash_bytes(const void* __ptr, size_t __len, size_t __seed);
>
>
>}
># 37 "/usr/include/c++/8/typeinfo" 2 3
>
>
>#pragma GCC visibility push(default)
>
>extern "C++" {
>
>namespace __cxxabiv1
>{
>  class __class_type_info;
>}
># 80 "/usr/include/c++/8/typeinfo" 3
>namespace std
>{
>
>
>
>
>
>
>  class type_info
>  {
>  public:
>
>
>
>
>    virtual ~type_info();
>
>
>
>    const char* name() const noexcept
>    { return __name[0] == '*' ? __name + 1 : __name; }
># 115 "/usr/include/c++/8/typeinfo" 3
>    bool before(const type_info& __arg) const noexcept
>    { return (__name[0] == '*' && __arg.__name[0] == '*')
> ? __name < __arg.__name
> : __builtin_strcmp (__name, __arg.__name) < 0; }
>
>    bool operator==(const type_info& __arg) const noexcept
>    {
>      return ((__name == __arg.__name)
>       || (__name[0] != '*' &&
>    __builtin_strcmp (__name, __arg.__name) == 0));
>    }
># 136 "/usr/include/c++/8/typeinfo" 3
>    bool operator!=(const type_info& __arg) const noexcept
>    { return !operator==(__arg); }
>
>
>    size_t hash_code() const noexcept
>    {
>
>      return _Hash_bytes(name(), __builtin_strlen(name()),
>    static_cast<size_t>(0xc70f6907UL));
>
>
>
>    }
>
>
>
>    virtual bool __is_pointer_p() const;
>
>
>    virtual bool __is_function_p() const;
>
>
>
>
>
>
>
>    virtual bool __do_catch(const type_info *__thr_type, void **__thr_obj,
>       unsigned __outer) const;
>
>
>    virtual bool __do_upcast(const __cxxabiv1::__class_type_info *__target,
>        void **__obj_ptr) const;
>
>  protected:
>    const char *__name;
>
>    explicit type_info(const char *__n): __name(__n) { }
>
>  private:
>
>    type_info& operator=(const type_info&);
>    type_info(const type_info&);
>  };
>
>
>
>
>
>
>
>  class bad_cast : public exception
>  {
>  public:
>    bad_cast() noexcept { }
>
>
>
>    virtual ~bad_cast() noexcept;
>
>
>    virtual const char* what() const noexcept;
>  };
>
>
>
>
>
>  class bad_typeid : public exception
>  {
>  public:
>    bad_typeid () noexcept { }
>
>
>
>    virtual ~bad_typeid() noexcept;
>
>
>    virtual const char* what() const noexcept;
>  };
>}
>
>}
>
>#pragma GCC visibility pop
># 40 "/usr/include/c++/8/bits/exception_ptr.h" 2 3
># 1 "/usr/include/c++/8/new" 1 3
># 37 "/usr/include/c++/8/new" 3
>       
># 38 "/usr/include/c++/8/new" 3
>
>
># 1 "/usr/include/c++/8/exception" 1 3
># 41 "/usr/include/c++/8/new" 2 3
>
>#pragma GCC visibility push(default)
>
>extern "C++" {
>
>namespace std
>{
>
>
>
>
>
>
>  class bad_alloc : public exception
>  {
>  public:
>    bad_alloc() throw() { }
>
>
>
>    virtual ~bad_alloc() throw();
>
>
>    virtual const char* what() const throw();
>  };
>
>
>  class bad_array_new_length : public bad_alloc
>  {
>  public:
>    bad_array_new_length() throw() { }
>
>
>
>    virtual ~bad_array_new_length() throw();
>
>
>    virtual const char* what() const throw();
>  };
>
>
>
>
>
>
>  struct nothrow_t
>  {
>
>    explicit nothrow_t() = default;
>
>  };
>
>  extern const nothrow_t nothrow;
>
>
>
>  typedef void (*new_handler)();
>
>
>
>  new_handler set_new_handler(new_handler) throw();
>
>
>
>  new_handler get_new_handler() noexcept;
>
>}
># 120 "/usr/include/c++/8/new" 3
>void* operator new(std::size_t)
>  __attribute__((__externally_visible__));
>void* operator new[](std::size_t)
>  __attribute__((__externally_visible__));
>void operator delete(void*) noexcept
>  __attribute__((__externally_visible__));
>void operator delete[](void*) noexcept
>  __attribute__((__externally_visible__));
>
>void operator delete(void*, std::size_t) noexcept
>  __attribute__((__externally_visible__));
>void operator delete[](void*, std::size_t) noexcept
>  __attribute__((__externally_visible__));
>
>void* operator new(std::size_t, const std::nothrow_t&) noexcept
>  __attribute__((__externally_visible__));
>void* operator new[](std::size_t, const std::nothrow_t&) noexcept
>  __attribute__((__externally_visible__));
>void operator delete(void*, const std::nothrow_t&) noexcept
>  __attribute__((__externally_visible__));
>void operator delete[](void*, const std::nothrow_t&) noexcept
>  __attribute__((__externally_visible__));
># 168 "/usr/include/c++/8/new" 3
>inline void* operator new(std::size_t, void* __p) noexcept
>{ return __p; }
>inline void* operator new[](std::size_t, void* __p) noexcept
>{ return __p; }
>
>
>inline void operator delete (void*, void*) noexcept { }
>inline void operator delete[](void*, void*) noexcept { }
>
>}
># 216 "/usr/include/c++/8/new" 3
>#pragma GCC visibility pop
># 41 "/usr/include/c++/8/bits/exception_ptr.h" 2 3
>
>extern "C++" {
>
>namespace std
>{
>  class type_info;
>
>
>
>
>
>  namespace __exception_ptr
>  {
>    class exception_ptr;
>  }
>
>  using __exception_ptr::exception_ptr;
>
>
>
>
>
>  exception_ptr current_exception() noexcept;
>
>  template<typename _Ex>
>  exception_ptr make_exception_ptr(_Ex) noexcept;
>
>
>  void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__));
>
>  namespace __exception_ptr
>  {
>    using std::rethrow_exception;
>
>
>
>
>
>    class exception_ptr
>    {
>      void* _M_exception_object;
>
>      explicit exception_ptr(void* __e) noexcept;
>
>      void _M_addref() noexcept;
>      void _M_release() noexcept;
>
>      void *_M_get() const noexcept __attribute__ ((__pure__));
>
>      friend exception_ptr std::current_exception() noexcept;
>      friend void std::rethrow_exception(exception_ptr);
>      template<typename _Ex>
>      friend exception_ptr std::make_exception_ptr(_Ex) noexcept;
>
>    public:
>      exception_ptr() noexcept;
>
>      exception_ptr(const exception_ptr&) noexcept;
>
>
>      exception_ptr(nullptr_t) noexcept
>      : _M_exception_object(0)
>      { }
>
>      exception_ptr(exception_ptr&& __o) noexcept
>      : _M_exception_object(__o._M_exception_object)
>      { __o._M_exception_object = 0; }
># 117 "/usr/include/c++/8/bits/exception_ptr.h" 3
>      exception_ptr&
>      operator=(const exception_ptr&) noexcept;
>
>
>      exception_ptr&
>      operator=(exception_ptr&& __o) noexcept
>      {
>        exception_ptr(static_cast<exception_ptr&&>(__o)).swap(*this);
>        return *this;
>      }
>
>
>      ~exception_ptr() noexcept;
>
>      void
>      swap(exception_ptr&) noexcept;
># 144 "/usr/include/c++/8/bits/exception_ptr.h" 3
>      explicit operator bool() const
>      { return _M_exception_object; }
>
>
>      friend bool
>      operator==(const exception_ptr&, const exception_ptr&)
> noexcept __attribute__ ((__pure__));
>
>      const class std::type_info*
>      __cxa_exception_type() const noexcept
> __attribute__ ((__pure__));
>    };
>
>    bool
>    operator==(const exception_ptr&, const exception_ptr&)
>      noexcept __attribute__ ((__pure__));
>
>    bool
>    operator!=(const exception_ptr&, const exception_ptr&)
>      noexcept __attribute__ ((__pure__));
>
>    inline void
>    swap(exception_ptr& __lhs, exception_ptr& __rhs)
>    { __lhs.swap(__rhs); }
>
>    template<typename _Ex>
>      inline void
>      __dest_thunk(void* __x)
>      { static_cast<_Ex*>(__x)->~_Ex(); }
>
>  }
>
>
>  template<typename _Ex>
>    exception_ptr
>    make_exception_ptr(_Ex __ex) noexcept
>    {
>
>      try
> {
>
>          void *__e = __cxxabiv1::__cxa_allocate_exception(sizeof(_Ex));
>          (void)__cxxabiv1::__cxa_init_primary_exception(
>       __e, const_cast<std::type_info*>(&typeid(__ex)),
>       __exception_ptr::__dest_thunk<_Ex>);
>          ::new (__e) _Ex(__ex);
>          return exception_ptr(__e);
>
>
>
> }
>      catch(...)
> {
>   return current_exception();
> }
>
>
>
>    }
>
>
>}
>
>}
>
>#pragma GCC visibility pop
># 144 "/usr/include/c++/8/exception" 2 3
># 1 "/usr/include/c++/8/bits/nested_exception.h" 1 3
># 33 "/usr/include/c++/8/bits/nested_exception.h" 3
>#pragma GCC visibility push(default)
>
>
>
>
>
>
># 1 "/usr/include/c++/8/bits/move.h" 1 3
># 34 "/usr/include/c++/8/bits/move.h" 3
># 1 "/usr/include/c++/8/bits/concept_check.h" 1 3
># 33 "/usr/include/c++/8/bits/concept_check.h" 3
>       
># 34 "/usr/include/c++/8/bits/concept_check.h" 3
># 35 "/usr/include/c++/8/bits/move.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>
>
>
>  template<typename _Tp>
>    inline constexpr _Tp*
>    __addressof(_Tp& __r) noexcept
>    { return __builtin_addressof(__r); }
>
>
>
>
>}
>
># 1 "/usr/include/c++/8/type_traits" 1 3
># 32 "/usr/include/c++/8/type_traits" 3
>       
># 33 "/usr/include/c++/8/type_traits" 3
># 42 "/usr/include/c++/8/type_traits" 3
>namespace std
>{
>  typedef short unsigned int uint_least16_t;
>  typedef unsigned int uint_least32_t;
>}
>
>
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 68 "/usr/include/c++/8/type_traits" 3
>  template<typename _Tp, _Tp __v>
>    struct integral_constant
>    {
>      static constexpr _Tp value = __v;
>      typedef _Tp value_type;
>      typedef integral_constant<_Tp, __v> type;
>      constexpr operator value_type() const noexcept { return value; }
>
>
>
>
>      constexpr value_type operator()() const noexcept { return value; }
>
>    };
>
>  template<typename _Tp, _Tp __v>
>    constexpr _Tp integral_constant<_Tp, __v>::value;
>
>
>  typedef integral_constant<bool, true> true_type;
>
>
>  typedef integral_constant<bool, false> false_type;
>
>  template<bool __v>
>    using __bool_constant = integral_constant<bool, __v>;
># 103 "/usr/include/c++/8/type_traits" 3
>  template<bool, typename, typename>
>    struct conditional;
>
>  template<typename...>
>    struct __or_;
>
>  template<>
>    struct __or_<>
>    : public false_type
>    { };
>
>  template<typename _B1>
>    struct __or_<_B1>
>    : public _B1
>    { };
>
>  template<typename _B1, typename _B2>
>    struct __or_<_B1, _B2>
>    : public conditional<_B1::value, _B1, _B2>::type
>    { };
>
>  template<typename _B1, typename _B2, typename _B3, typename... _Bn>
>    struct __or_<_B1, _B2, _B3, _Bn...>
>    : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type
>    { };
>
>  template<typename...>
>    struct __and_;
>
>  template<>
>    struct __and_<>
>    : public true_type
>    { };
>
>  template<typename _B1>
>    struct __and_<_B1>
>    : public _B1
>    { };
>
>  template<typename _B1, typename _B2>
>    struct __and_<_B1, _B2>
>    : public conditional<_B1::value, _B2, _B1>::type
>    { };
>
>  template<typename _B1, typename _B2, typename _B3, typename... _Bn>
>    struct __and_<_B1, _B2, _B3, _Bn...>
>    : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type
>    { };
>
>  template<typename _Pp>
>    struct __not_
>    : public __bool_constant<!bool(_Pp::value)>
>    { };
># 192 "/usr/include/c++/8/type_traits" 3
>  template<typename _Tp>
>    struct __success_type
>    { typedef _Tp type; };
>
>  struct __failure_type
>  { };
>
>
>
>  template<typename>
>    struct remove_cv;
>
>  template<typename>
>    struct __is_void_helper
>    : public false_type { };
>
>  template<>
>    struct __is_void_helper<void>
>    : public true_type { };
>
>
>  template<typename _Tp>
>    struct is_void
>    : public __is_void_helper<typename remove_cv<_Tp>::type>::type
>    { };
>
>  template<typename>
>    struct __is_integral_helper
>    : public false_type { };
>
>  template<>
>    struct __is_integral_helper<bool>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<char>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<signed char>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<unsigned char>
>    : public true_type { };
>
>
>  template<>
>    struct __is_integral_helper<wchar_t>
>    : public true_type { };
>
>
>  template<>
>    struct __is_integral_helper<char16_t>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<char32_t>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<short>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<unsigned short>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<int>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<unsigned int>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<long>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<unsigned long>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<long long>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<unsigned long long>
>    : public true_type { };
>
>
>
>
>  template<>
>    struct __is_integral_helper<__int128>
>    : public true_type { };
>
>  template<>
>    struct __is_integral_helper<unsigned __int128>
>    : public true_type { };
># 324 "/usr/include/c++/8/type_traits" 3
>  template<typename _Tp>
>    struct is_integral
>    : public __is_integral_helper<typename remove_cv<_Tp>::type>::type
>    { };
>
>  template<typename>
>    struct __is_floating_point_helper
>    : public false_type { };
>
>  template<>
>    struct __is_floating_point_helper<float>
>    : public true_type { };
>
>  template<>
>    struct __is_floating_point_helper<double>
>    : public true_type { };
>
>  template<>
>    struct __is_floating_point_helper<long double>
>    : public true_type { };
>
>
>  template<>
>    struct __is_floating_point_helper<__float128>
>    : public true_type { };
>
>
>
>  template<typename _Tp>
>    struct is_floating_point
>    : public __is_floating_point_helper<typename remove_cv<_Tp>::type>::type
>    { };
>
>
>  template<typename>
>    struct is_array
>    : public false_type { };
>
>  template<typename _Tp, std::size_t _Size>
>    struct is_array<_Tp[_Size]>
>    : public true_type { };
>
>  template<typename _Tp>
>    struct is_array<_Tp[]>
>    : public true_type { };
>
>  template<typename>
>    struct __is_pointer_helper
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_pointer_helper<_Tp*>
>    : public true_type { };
>
>
>  template<typename _Tp>
>    struct is_pointer
>    : public __is_pointer_helper<typename remove_cv<_Tp>::type>::type
>    { };
>
>
>  template<typename>
>    struct is_lvalue_reference
>    : public false_type { };
>
>  template<typename _Tp>
>    struct is_lvalue_reference<_Tp&>
>    : public true_type { };
>
>
>  template<typename>
>    struct is_rvalue_reference
>    : public false_type { };
>
>  template<typename _Tp>
>    struct is_rvalue_reference<_Tp&&>
>    : public true_type { };
>
>  template<typename>
>    struct is_function;
>
>  template<typename>
>    struct __is_member_object_pointer_helper
>    : public false_type { };
>
>  template<typename _Tp, typename _Cp>
>    struct __is_member_object_pointer_helper<_Tp _Cp::*>
>    : public integral_constant<bool, !is_function<_Tp>::value> { };
>
>
>  template<typename _Tp>
>    struct is_member_object_pointer
>    : public __is_member_object_pointer_helper<
>    typename remove_cv<_Tp>::type>::type
>    { };
>
>  template<typename>
>    struct __is_member_function_pointer_helper
>    : public false_type { };
>
>  template<typename _Tp, typename _Cp>
>    struct __is_member_function_pointer_helper<_Tp _Cp::*>
>    : public integral_constant<bool, is_function<_Tp>::value> { };
>
>
>  template<typename _Tp>
>    struct is_member_function_pointer
>    : public __is_member_function_pointer_helper<
>    typename remove_cv<_Tp>::type>::type
>    { };
>
>
>  template<typename _Tp>
>    struct is_enum
>    : public integral_constant<bool, __is_enum(_Tp)>
>    { };
>
>
>  template<typename _Tp>
>    struct is_union
>    : public integral_constant<bool, __is_union(_Tp)>
>    { };
>
>
>  template<typename _Tp>
>    struct is_class
>    : public integral_constant<bool, __is_class(_Tp)>
>    { };
>
>
>  template<typename>
>    struct is_function
>    : public false_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes...) >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes...) & >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes...) && >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes......) >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes......) & >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes......) && >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes...) const >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes...) const & >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes...) const && >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes......) const >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes......) const & >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes......) const && >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes...) volatile >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes...) volatile & >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes...) volatile && >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes......) volatile >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes......) volatile & >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes......) volatile && >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes...) const volatile >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes...) const volatile & >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes...) const volatile && >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes......) const volatile >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes......) const volatile & >
>    : public true_type { };
>
>  template<typename _Res, typename... _ArgTypes >
>    struct is_function<_Res(_ArgTypes......) const volatile && >
>    : public true_type { };
>
>
>
>  template<typename>
>    struct __is_null_pointer_helper
>    : public false_type { };
>
>  template<>
>    struct __is_null_pointer_helper<std::nullptr_t>
>    : public true_type { };
>
>
>  template<typename _Tp>
>    struct is_null_pointer
>    : public __is_null_pointer_helper<typename remove_cv<_Tp>::type>::type
>    { };
>
>
>  template<typename _Tp>
>    struct __is_nullptr_t
>    : public is_null_pointer<_Tp>
>    { };
>
>
>
>
>  template<typename _Tp>
>    struct is_reference
>    : public __or_<is_lvalue_reference<_Tp>,
>                   is_rvalue_reference<_Tp>>::type
>    { };
>
>
>  template<typename _Tp>
>    struct is_arithmetic
>    : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type
>    { };
>
>
>  template<typename _Tp>
>    struct is_fundamental
>    : public __or_<is_arithmetic<_Tp>, is_void<_Tp>,
>     is_null_pointer<_Tp>>::type
>    { };
>
>
>  template<typename _Tp>
>    struct is_object
>    : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>,
>                          is_void<_Tp>>>::type
>    { };
>
>  template<typename>
>    struct is_member_pointer;
>
>
>  template<typename _Tp>
>    struct is_scalar
>    : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>,
>                   is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type
>    { };
>
>
>  template<typename _Tp>
>    struct is_compound
>    : public integral_constant<bool, !is_fundamental<_Tp>::value> { };
>
>  template<typename _Tp>
>    struct __is_member_pointer_helper
>    : public false_type { };
>
>  template<typename _Tp, typename _Cp>
>    struct __is_member_pointer_helper<_Tp _Cp::*>
>    : public true_type { };
>
>
>  template<typename _Tp>
>    struct is_member_pointer
>    : public __is_member_pointer_helper<typename remove_cv<_Tp>::type>::type
>    { };
>
>
>
>  template<typename _Tp>
>    struct __is_referenceable
>    : public __or_<is_object<_Tp>, is_reference<_Tp>>::type
>    { };
>
>  template<typename _Res, typename... _Args >
>    struct __is_referenceable<_Res(_Args...) >
>    : public true_type
>    { };
>
>  template<typename _Res, typename... _Args >
>    struct __is_referenceable<_Res(_Args......) >
>    : public true_type
>    { };
>
>
>
>
>  template<typename>
>    struct is_const
>    : public false_type { };
>
>  template<typename _Tp>
>    struct is_const<_Tp const>
>    : public true_type { };
>
>
>  template<typename>
>    struct is_volatile
>    : public false_type { };
>
>  template<typename _Tp>
>    struct is_volatile<_Tp volatile>
>    : public true_type { };
>
>
>  template<typename _Tp>
>    struct is_trivial
>    : public integral_constant<bool, __is_trivial(_Tp)>
>    { };
>
>
>  template<typename _Tp>
>    struct is_trivially_copyable
>    : public integral_constant<bool, __is_trivially_copyable(_Tp)>
>    { };
>
>
>  template<typename _Tp>
>    struct is_standard_layout
>    : public integral_constant<bool, __is_standard_layout(_Tp)>
>    { };
>
>
>
>  template<typename _Tp>
>    struct is_pod
>    : public integral_constant<bool, __is_pod(_Tp)>
>    { };
>
>
>  template<typename _Tp>
>    struct is_literal_type
>    : public integral_constant<bool, __is_literal_type(_Tp)>
>    { };
>
>
>  template<typename _Tp>
>    struct is_empty
>    : public integral_constant<bool, __is_empty(_Tp)>
>    { };
>
>
>  template<typename _Tp>
>    struct is_polymorphic
>    : public integral_constant<bool, __is_polymorphic(_Tp)>
>    { };
>
>
>
>
>  template<typename _Tp>
>    struct is_final
>    : public integral_constant<bool, __is_final(_Tp)>
>    { };
>
>
>
>  template<typename _Tp>
>    struct is_abstract
>    : public integral_constant<bool, __is_abstract(_Tp)>
>    { };
>
>  template<typename _Tp,
>    bool = is_arithmetic<_Tp>::value>
>    struct __is_signed_helper
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_signed_helper<_Tp, true>
>    : public integral_constant<bool, _Tp(-1) < _Tp(0)>
>    { };
>
>
>  template<typename _Tp>
>    struct is_signed
>    : public __is_signed_helper<_Tp>::type
>    { };
>
>
>  template<typename _Tp>
>    struct is_unsigned
>    : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>
>    { };
># 759 "/usr/include/c++/8/type_traits" 3
>  template<typename _Tp, typename _Up = _Tp&&>
>    _Up
>    __declval(int);
>
>  template<typename _Tp>
>    _Tp
>    __declval(long);
>
>  template<typename _Tp>
>    auto declval() noexcept -> decltype(__declval<_Tp>(0));
>
>  template<typename, unsigned = 0>
>    struct extent;
>
>  template<typename>
>    struct remove_all_extents;
>
>  template<typename _Tp>
>    struct __is_array_known_bounds
>    : public integral_constant<bool, (extent<_Tp>::value > 0)>
>    { };
>
>  template<typename _Tp>
>    struct __is_array_unknown_bounds
>    : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>
>    { };
>
>
>
>
>
>
>  struct __do_is_destructible_impl
>  {
>    template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())>
>      static true_type __test(int);
>
>    template<typename>
>      static false_type __test(...);
>  };
>
>  template<typename _Tp>
>    struct __is_destructible_impl
>    : public __do_is_destructible_impl
>    {
>      typedef decltype(__test<_Tp>(0)) type;
>    };
>
>  template<typename _Tp,
>           bool = __or_<is_void<_Tp>,
>                        __is_array_unknown_bounds<_Tp>,
>                        is_function<_Tp>>::value,
>           bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
>    struct __is_destructible_safe;
>
>  template<typename _Tp>
>    struct __is_destructible_safe<_Tp, false, false>
>    : public __is_destructible_impl<typename
>               remove_all_extents<_Tp>::type>::type
>    { };
>
>  template<typename _Tp>
>    struct __is_destructible_safe<_Tp, true, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_destructible_safe<_Tp, false, true>
>    : public true_type { };
>
>
>  template<typename _Tp>
>    struct is_destructible
>    : public __is_destructible_safe<_Tp>::type
>    { };
>
>
>
>
>
>  struct __do_is_nt_destructible_impl
>  {
>    template<typename _Tp>
>      static integral_constant<bool, noexcept(declval<_Tp&>().~_Tp())>
>        __test(int);
>
>    template<typename>
>      static false_type __test(...);
>  };
>
>  template<typename _Tp>
>    struct __is_nt_destructible_impl
>    : public __do_is_nt_destructible_impl
>    {
>      typedef decltype(__test<_Tp>(0)) type;
>    };
>
>  template<typename _Tp,
>           bool = __or_<is_void<_Tp>,
>                        __is_array_unknown_bounds<_Tp>,
>                        is_function<_Tp>>::value,
>           bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
>    struct __is_nt_destructible_safe;
>
>  template<typename _Tp>
>    struct __is_nt_destructible_safe<_Tp, false, false>
>    : public __is_nt_destructible_impl<typename
>               remove_all_extents<_Tp>::type>::type
>    { };
>
>  template<typename _Tp>
>    struct __is_nt_destructible_safe<_Tp, true, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_nt_destructible_safe<_Tp, false, true>
>    : public true_type { };
>
>
>  template<typename _Tp>
>    struct is_nothrow_destructible
>    : public __is_nt_destructible_safe<_Tp>::type
>    { };
>
>  struct __do_is_default_constructible_impl
>  {
>    template<typename _Tp, typename = decltype(_Tp())>
>      static true_type __test(int);
>
>    template<typename>
>      static false_type __test(...);
>  };
>
>  template<typename _Tp>
>    struct __is_default_constructible_impl
>    : public __do_is_default_constructible_impl
>    {
>      typedef decltype(__test<_Tp>(0)) type;
>    };
>
>  template<typename _Tp>
>    struct __is_default_constructible_atom
>    : public __and_<__not_<is_void<_Tp>>,
>                    __is_default_constructible_impl<_Tp>>
>    { };
>
>  template<typename _Tp, bool = is_array<_Tp>::value>
>    struct __is_default_constructible_safe;
>
>
>
>
>
>
>  template<typename _Tp>
>    struct __is_default_constructible_safe<_Tp, true>
>    : public __and_<__is_array_known_bounds<_Tp>,
>      __is_default_constructible_atom<typename
>                      remove_all_extents<_Tp>::type>>
>    { };
>
>  template<typename _Tp>
>    struct __is_default_constructible_safe<_Tp, false>
>    : public __is_default_constructible_atom<_Tp>::type
>    { };
>
>
>  template<typename _Tp>
>    struct is_default_constructible
>    : public __is_default_constructible_safe<_Tp>::type
>    { };
>
>
>  template<typename _Tp, typename... _Args>
>    struct is_constructible
>      : public __bool_constant<__is_constructible(_Tp, _Args...)>
>    { };
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __is_copy_constructible_impl;
>
>  template<typename _Tp>
>    struct __is_copy_constructible_impl<_Tp, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_copy_constructible_impl<_Tp, true>
>    : public is_constructible<_Tp, const _Tp&>
>    { };
>
>
>  template<typename _Tp>
>    struct is_copy_constructible
>    : public __is_copy_constructible_impl<_Tp>
>    { };
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __is_move_constructible_impl;
>
>  template<typename _Tp>
>    struct __is_move_constructible_impl<_Tp, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_move_constructible_impl<_Tp, true>
>    : public is_constructible<_Tp, _Tp&&>
>    { };
>
>
>  template<typename _Tp>
>    struct is_move_constructible
>    : public __is_move_constructible_impl<_Tp>
>    { };
>
>  template<typename _Tp>
>    struct __is_nt_default_constructible_atom
>    : public integral_constant<bool, noexcept(_Tp())>
>    { };
>
>  template<typename _Tp, bool = is_array<_Tp>::value>
>    struct __is_nt_default_constructible_impl;
>
>  template<typename _Tp>
>    struct __is_nt_default_constructible_impl<_Tp, true>
>    : public __and_<__is_array_known_bounds<_Tp>,
>      __is_nt_default_constructible_atom<typename
>                      remove_all_extents<_Tp>::type>>
>    { };
>
>  template<typename _Tp>
>    struct __is_nt_default_constructible_impl<_Tp, false>
>    : public __is_nt_default_constructible_atom<_Tp>
>    { };
>
>
>  template<typename _Tp>
>    struct is_nothrow_default_constructible
>    : public __and_<is_default_constructible<_Tp>,
>                    __is_nt_default_constructible_impl<_Tp>>
>    { };
>
>  template<typename _Tp, typename... _Args>
>    struct __is_nt_constructible_impl
>    : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))>
>    { };
>
>  template<typename _Tp, typename _Arg>
>    struct __is_nt_constructible_impl<_Tp, _Arg>
>    : public integral_constant<bool,
>                               noexcept(static_cast<_Tp>(declval<_Arg>()))>
>    { };
>
>  template<typename _Tp>
>    struct __is_nt_constructible_impl<_Tp>
>    : public is_nothrow_default_constructible<_Tp>
>    { };
>
>
>  template<typename _Tp, typename... _Args>
>    struct is_nothrow_constructible
>    : public __and_<is_constructible<_Tp, _Args...>,
>      __is_nt_constructible_impl<_Tp, _Args...>>
>    { };
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __is_nothrow_copy_constructible_impl;
>
>  template<typename _Tp>
>    struct __is_nothrow_copy_constructible_impl<_Tp, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_nothrow_copy_constructible_impl<_Tp, true>
>    : public is_nothrow_constructible<_Tp, const _Tp&>
>    { };
>
>
>  template<typename _Tp>
>    struct is_nothrow_copy_constructible
>    : public __is_nothrow_copy_constructible_impl<_Tp>
>    { };
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __is_nothrow_move_constructible_impl;
>
>  template<typename _Tp>
>    struct __is_nothrow_move_constructible_impl<_Tp, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_nothrow_move_constructible_impl<_Tp, true>
>    : public is_nothrow_constructible<_Tp, _Tp&&>
>    { };
>
>
>  template<typename _Tp>
>    struct is_nothrow_move_constructible
>    : public __is_nothrow_move_constructible_impl<_Tp>
>    { };
>
>
>  template<typename _Tp, typename _Up>
>    struct is_assignable
>      : public __bool_constant<__is_assignable(_Tp, _Up)>
>    { };
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __is_copy_assignable_impl;
>
>  template<typename _Tp>
>    struct __is_copy_assignable_impl<_Tp, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_copy_assignable_impl<_Tp, true>
>    : public is_assignable<_Tp&, const _Tp&>
>    { };
>
>
>  template<typename _Tp>
>    struct is_copy_assignable
>    : public __is_copy_assignable_impl<_Tp>
>    { };
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __is_move_assignable_impl;
>
>  template<typename _Tp>
>    struct __is_move_assignable_impl<_Tp, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_move_assignable_impl<_Tp, true>
>    : public is_assignable<_Tp&, _Tp&&>
>    { };
>
>
>  template<typename _Tp>
>    struct is_move_assignable
>    : public __is_move_assignable_impl<_Tp>
>    { };
>
>  template<typename _Tp, typename _Up>
>    struct __is_nt_assignable_impl
>    : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())>
>    { };
>
>
>  template<typename _Tp, typename _Up>
>    struct is_nothrow_assignable
>    : public __and_<is_assignable<_Tp, _Up>,
>      __is_nt_assignable_impl<_Tp, _Up>>
>    { };
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __is_nt_copy_assignable_impl;
>
>  template<typename _Tp>
>    struct __is_nt_copy_assignable_impl<_Tp, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_nt_copy_assignable_impl<_Tp, true>
>    : public is_nothrow_assignable<_Tp&, const _Tp&>
>    { };
>
>
>  template<typename _Tp>
>    struct is_nothrow_copy_assignable
>    : public __is_nt_copy_assignable_impl<_Tp>
>    { };
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __is_nt_move_assignable_impl;
>
>  template<typename _Tp>
>    struct __is_nt_move_assignable_impl<_Tp, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_nt_move_assignable_impl<_Tp, true>
>    : public is_nothrow_assignable<_Tp&, _Tp&&>
>    { };
>
>
>  template<typename _Tp>
>    struct is_nothrow_move_assignable
>    : public __is_nt_move_assignable_impl<_Tp>
>    { };
>
>
>  template<typename _Tp, typename... _Args>
>    struct is_trivially_constructible
>    : public __bool_constant<__is_trivially_constructible(_Tp, _Args...)>
>    { };
>
>
>  template<typename _Tp>
>    struct is_trivially_default_constructible
>    : public is_trivially_constructible<_Tp>::type
>    { };
>
>  struct __do_is_implicitly_default_constructible_impl
>  {
>    template <typename _Tp>
>    static void __helper(const _Tp&);
>
>    template <typename _Tp>
>    static true_type __test(const _Tp&,
>                            decltype(__helper<const _Tp&>({}))* = 0);
>
>    static false_type __test(...);
>  };
>
>  template<typename _Tp>
>    struct __is_implicitly_default_constructible_impl
>      : public __do_is_implicitly_default_constructible_impl
>  {
>    typedef decltype(__test(declval<_Tp>())) type;
>  };
>
>  template<typename _Tp>
>    struct __is_implicitly_default_constructible_safe
>      : public __is_implicitly_default_constructible_impl<_Tp>::type
>  { };
>
>  template <typename _Tp>
>    struct __is_implicitly_default_constructible
>      : public __and_<is_default_constructible<_Tp>,
>                      __is_implicitly_default_constructible_safe<_Tp>>
>  { };
>
>
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __is_trivially_copy_constructible_impl;
>
>  template<typename _Tp>
>    struct __is_trivially_copy_constructible_impl<_Tp, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_trivially_copy_constructible_impl<_Tp, true>
>    : public __and_<is_copy_constructible<_Tp>,
>      integral_constant<bool,
>   __is_trivially_constructible(_Tp, const _Tp&)>>
>    { };
>
>  template<typename _Tp>
>    struct is_trivially_copy_constructible
>    : public __is_trivially_copy_constructible_impl<_Tp>
>    { };
>
>
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __is_trivially_move_constructible_impl;
>
>  template<typename _Tp>
>    struct __is_trivially_move_constructible_impl<_Tp, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_trivially_move_constructible_impl<_Tp, true>
>    : public __and_<is_move_constructible<_Tp>,
>      integral_constant<bool,
>   __is_trivially_constructible(_Tp, _Tp&&)>>
>    { };
>
>  template<typename _Tp>
>    struct is_trivially_move_constructible
>    : public __is_trivially_move_constructible_impl<_Tp>
>    { };
>
>
>  template<typename _Tp, typename _Up>
>    struct is_trivially_assignable
>    : public __bool_constant<__is_trivially_assignable(_Tp, _Up)>
>    { };
>
>
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __is_trivially_copy_assignable_impl;
>
>  template<typename _Tp>
>    struct __is_trivially_copy_assignable_impl<_Tp, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_trivially_copy_assignable_impl<_Tp, true>
>    : public __and_<is_copy_assignable<_Tp>,
>      integral_constant<bool,
>   __is_trivially_assignable(_Tp&, const _Tp&)>>
>    { };
>
>  template<typename _Tp>
>    struct is_trivially_copy_assignable
>    : public __is_trivially_copy_assignable_impl<_Tp>
>    { };
>
>
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __is_trivially_move_assignable_impl;
>
>  template<typename _Tp>
>    struct __is_trivially_move_assignable_impl<_Tp, false>
>    : public false_type { };
>
>  template<typename _Tp>
>    struct __is_trivially_move_assignable_impl<_Tp, true>
>    : public __and_<is_move_assignable<_Tp>,
>      integral_constant<bool,
>   __is_trivially_assignable(_Tp&, _Tp&&)>>
>    { };
>
>  template<typename _Tp>
>    struct is_trivially_move_assignable
>    : public __is_trivially_move_assignable_impl<_Tp>
>    { };
>
>
>  template<typename _Tp>
>    struct is_trivially_destructible
>    : public __and_<is_destructible<_Tp>, integral_constant<bool,
>         __has_trivial_destructor(_Tp)>>
>    { };
>
>
>
>  template<typename _Tp>
>    struct has_virtual_destructor
>    : public integral_constant<bool, __has_virtual_destructor(_Tp)>
>    { };
>
>
>
>
>
>  template<typename _Tp>
>    struct alignment_of
>    : public integral_constant<std::size_t, __alignof__(_Tp)> { };
>
>
>  template<typename>
>    struct rank
>    : public integral_constant<std::size_t, 0> { };
>
>  template<typename _Tp, std::size_t _Size>
>    struct rank<_Tp[_Size]>
>    : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
>
>  template<typename _Tp>
>    struct rank<_Tp[]>
>    : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
>
>
>  template<typename, unsigned _Uint>
>    struct extent
>    : public integral_constant<std::size_t, 0> { };
>
>  template<typename _Tp, unsigned _Uint, std::size_t _Size>
>    struct extent<_Tp[_Size], _Uint>
>    : public integral_constant<std::size_t,
>          _Uint == 0 ? _Size : extent<_Tp,
>          _Uint - 1>::value>
>    { };
>
>  template<typename _Tp, unsigned _Uint>
>    struct extent<_Tp[], _Uint>
>    : public integral_constant<std::size_t,
>          _Uint == 0 ? 0 : extent<_Tp,
>             _Uint - 1>::value>
>    { };
>
>
>
>
>
>  template<typename, typename>
>    struct is_same
>    : public false_type { };
>
>  template<typename _Tp>
>    struct is_same<_Tp, _Tp>
>    : public true_type { };
>
>
>  template<typename _Base, typename _Derived>
>    struct is_base_of
>    : public integral_constant<bool, __is_base_of(_Base, _Derived)>
>    { };
>
>  template<typename _From, typename _To,
>           bool = __or_<is_void<_From>, is_function<_To>,
>                        is_array<_To>>::value>
>    struct __is_convertible_helper
>    { typedef typename is_void<_To>::type type; };
>
>  template<typename _From, typename _To>
>    class __is_convertible_helper<_From, _To, false>
>    {
>       template<typename _To1>
> static void __test_aux(_To1);
>
>      template<typename _From1, typename _To1,
>        typename = decltype(__test_aux<_To1>(std::declval<_From1>()))>
> static true_type
> __test(int);
>
>      template<typename, typename>
> static false_type
> __test(...);
>
>    public:
>      typedef decltype(__test<_From, _To>(0)) type;
>    };
>
>
>
>  template<typename _From, typename _To>
>    struct is_convertible
>    : public __is_convertible_helper<_From, _To>::type
>    { };
>
>
>
>
>
>  template<typename _Tp>
>    struct remove_const
>    { typedef _Tp type; };
>
>  template<typename _Tp>
>    struct remove_const<_Tp const>
>    { typedef _Tp type; };
>
>
>  template<typename _Tp>
>    struct remove_volatile
>    { typedef _Tp type; };
>
>  template<typename _Tp>
>    struct remove_volatile<_Tp volatile>
>    { typedef _Tp type; };
>
>
>  template<typename _Tp>
>    struct remove_cv
>    {
>      typedef typename
>      remove_const<typename remove_volatile<_Tp>::type>::type type;
>    };
>
>
>  template<typename _Tp>
>    struct add_const
>    { typedef _Tp const type; };
>
>
>  template<typename _Tp>
>    struct add_volatile
>    { typedef _Tp volatile type; };
>
>
>  template<typename _Tp>
>    struct add_cv
>    {
>      typedef typename
>      add_const<typename add_volatile<_Tp>::type>::type type;
>    };
>
>
>
>
>
>
>  template<typename _Tp>
>    using remove_const_t = typename remove_const<_Tp>::type;
>
>
>  template<typename _Tp>
>    using remove_volatile_t = typename remove_volatile<_Tp>::type;
>
>
>  template<typename _Tp>
>    using remove_cv_t = typename remove_cv<_Tp>::type;
>
>
>  template<typename _Tp>
>    using add_const_t = typename add_const<_Tp>::type;
>
>
>  template<typename _Tp>
>    using add_volatile_t = typename add_volatile<_Tp>::type;
>
>
>  template<typename _Tp>
>    using add_cv_t = typename add_cv<_Tp>::type;
>
>
>
>
>
>  template<typename _Tp>
>    struct remove_reference
>    { typedef _Tp type; };
>
>  template<typename _Tp>
>    struct remove_reference<_Tp&>
>    { typedef _Tp type; };
>
>  template<typename _Tp>
>    struct remove_reference<_Tp&&>
>    { typedef _Tp type; };
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __add_lvalue_reference_helper
>    { typedef _Tp type; };
>
>  template<typename _Tp>
>    struct __add_lvalue_reference_helper<_Tp, true>
>    { typedef _Tp& type; };
>
>
>  template<typename _Tp>
>    struct add_lvalue_reference
>    : public __add_lvalue_reference_helper<_Tp>
>    { };
>
>  template<typename _Tp, bool = __is_referenceable<_Tp>::value>
>    struct __add_rvalue_reference_helper
>    { typedef _Tp type; };
>
>  template<typename _Tp>
>    struct __add_rvalue_reference_helper<_Tp, true>
>    { typedef _Tp&& type; };
>
>
>  template<typename _Tp>
>    struct add_rvalue_reference
>    : public __add_rvalue_reference_helper<_Tp>
>    { };
>
>
>
>  template<typename _Tp>
>    using remove_reference_t = typename remove_reference<_Tp>::type;
>
>
>  template<typename _Tp>
>    using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
>
>
>  template<typename _Tp>
>    using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
>
>
>
>
>
>  template<typename _Unqualified, bool _IsConst, bool _IsVol>
>    struct __cv_selector;
>
>  template<typename _Unqualified>
>    struct __cv_selector<_Unqualified, false, false>
>    { typedef _Unqualified __type; };
>
>  template<typename _Unqualified>
>    struct __cv_selector<_Unqualified, false, true>
>    { typedef volatile _Unqualified __type; };
>
>  template<typename _Unqualified>
>    struct __cv_selector<_Unqualified, true, false>
>    { typedef const _Unqualified __type; };
>
>  template<typename _Unqualified>
>    struct __cv_selector<_Unqualified, true, true>
>    { typedef const volatile _Unqualified __type; };
>
>  template<typename _Qualified, typename _Unqualified,
>    bool _IsConst = is_const<_Qualified>::value,
>    bool _IsVol = is_volatile<_Qualified>::value>
>    class __match_cv_qualifiers
>    {
>      typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
>
>    public:
>      typedef typename __match::__type __type;
>    };
>
>
>  template<typename _Tp>
>    struct __make_unsigned
>    { typedef _Tp __type; };
>
>  template<>
>    struct __make_unsigned<char>
>    { typedef unsigned char __type; };
>
>  template<>
>    struct __make_unsigned<signed char>
>    { typedef unsigned char __type; };
>
>  template<>
>    struct __make_unsigned<short>
>    { typedef unsigned short __type; };
>
>  template<>
>    struct __make_unsigned<int>
>    { typedef unsigned int __type; };
>
>  template<>
>    struct __make_unsigned<long>
>    { typedef unsigned long __type; };
>
>  template<>
>    struct __make_unsigned<long long>
>    { typedef unsigned long long __type; };
>
>
>  template<>
>    struct __make_unsigned<wchar_t> : __make_unsigned<int>
>    { };
>
>
>
>  template<>
>    struct __make_unsigned<__int128>
>    { typedef unsigned __int128 __type; };
># 1607 "/usr/include/c++/8/type_traits" 3
>  template<typename _Tp,
>    bool _IsInt = is_integral<_Tp>::value,
>    bool _IsEnum = is_enum<_Tp>::value>
>    class __make_unsigned_selector;
>
>  template<typename _Tp>
>    class __make_unsigned_selector<_Tp, true, false>
>    {
>      typedef __make_unsigned<typename remove_cv<_Tp>::type> __unsignedt;
>      typedef typename __unsignedt::__type __unsigned_type;
>      typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned;
>
>    public:
>      typedef typename __cv_unsigned::__type __type;
>    };
>
>  template<typename _Tp>
>    class __make_unsigned_selector<_Tp, false, true>
>    {
>
>      typedef unsigned char __smallest;
>      static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest);
>      static const bool __b1 = sizeof(_Tp) <= sizeof(unsigned short);
>      static const bool __b2 = sizeof(_Tp) <= sizeof(unsigned int);
>      static const bool __b3 = sizeof(_Tp) <= sizeof(unsigned long);
>      typedef conditional<__b3, unsigned long, unsigned long long> __cond3;
>      typedef typename __cond3::type __cond3_type;
>      typedef conditional<__b2, unsigned int, __cond3_type> __cond2;
>      typedef typename __cond2::type __cond2_type;
>      typedef conditional<__b1, unsigned short, __cond2_type> __cond1;
>      typedef typename __cond1::type __cond1_type;
>
>      typedef typename conditional<__b0, __smallest, __cond1_type>::type
> __unsigned_type;
>      typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned;
>
>    public:
>      typedef typename __cv_unsigned::__type __type;
>    };
>
>
>
>
>
>  template<typename _Tp>
>    struct make_unsigned
>    { typedef typename __make_unsigned_selector<_Tp>::__type type; };
>
>
>  template<>
>    struct make_unsigned<bool>;
>
>
>
>  template<typename _Tp>
>    struct __make_signed
>    { typedef _Tp __type; };
>
>  template<>
>    struct __make_signed<char>
>    { typedef signed char __type; };
>
>  template<>
>    struct __make_signed<unsigned char>
>    { typedef signed char __type; };
>
>  template<>
>    struct __make_signed<unsigned short>
>    { typedef signed short __type; };
>
>  template<>
>    struct __make_signed<unsigned int>
>    { typedef signed int __type; };
>
>  template<>
>    struct __make_signed<unsigned long>
>    { typedef signed long __type; };
>
>  template<>
>    struct __make_signed<unsigned long long>
>    { typedef signed long long __type; };
># 1696 "/usr/include/c++/8/type_traits" 3
>  template<>
>    struct __make_signed<char16_t> : __make_signed<uint_least16_t>
>    { };
>  template<>
>    struct __make_signed<char32_t> : __make_signed<uint_least32_t>
>    { };
>
>
>
>  template<>
>    struct __make_signed<unsigned __int128>
>    { typedef __int128 __type; };
># 1726 "/usr/include/c++/8/type_traits" 3
>  template<typename _Tp,
>    bool _IsInt = is_integral<_Tp>::value,
>    bool _IsEnum = is_enum<_Tp>::value>
>    class __make_signed_selector;
>
>  template<typename _Tp>
>    class __make_signed_selector<_Tp, true, false>
>    {
>      typedef __make_signed<typename remove_cv<_Tp>::type> __signedt;
>      typedef typename __signedt::__type __signed_type;
>      typedef __match_cv_qualifiers<_Tp, __signed_type> __cv_signed;
>
>    public:
>      typedef typename __cv_signed::__type __type;
>    };
>
>  template<typename _Tp>
>    class __make_signed_selector<_Tp, false, true>
>    {
>      typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type;
>
>    public:
>      typedef typename __make_signed_selector<__unsigned_type>::__type __type;
>    };
>
>
>
>
>
>  template<typename _Tp>
>    struct make_signed
>    { typedef typename __make_signed_selector<_Tp>::__type type; };
>
>
>  template<>
>    struct make_signed<bool>;
>
>
>
>  template<typename _Tp>
>    using make_signed_t = typename make_signed<_Tp>::type;
>
>
>  template<typename _Tp>
>    using make_unsigned_t = typename make_unsigned<_Tp>::type;
>
>
>
>
>
>  template<typename _Tp>
>    struct remove_extent
>    { typedef _Tp type; };
>
>  template<typename _Tp, std::size_t _Size>
>    struct remove_extent<_Tp[_Size]>
>    { typedef _Tp type; };
>
>  template<typename _Tp>
>    struct remove_extent<_Tp[]>
>    { typedef _Tp type; };
>
>
>  template<typename _Tp>
>    struct remove_all_extents
>    { typedef _Tp type; };
>
>  template<typename _Tp, std::size_t _Size>
>    struct remove_all_extents<_Tp[_Size]>
>    { typedef typename remove_all_extents<_Tp>::type type; };
>
>  template<typename _Tp>
>    struct remove_all_extents<_Tp[]>
>    { typedef typename remove_all_extents<_Tp>::type type; };
>
>
>
>  template<typename _Tp>
>    using remove_extent_t = typename remove_extent<_Tp>::type;
>
>
>  template<typename _Tp>
>    using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
>
>
>
>
>  template<typename _Tp, typename>
>    struct __remove_pointer_helper
>    { typedef _Tp type; };
>
>  template<typename _Tp, typename _Up>
>    struct __remove_pointer_helper<_Tp, _Up*>
>    { typedef _Up type; };
>
>
>  template<typename _Tp>
>    struct remove_pointer
>    : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
>    { };
>
>
>  template<typename _Tp, bool = __or_<__is_referenceable<_Tp>,
>          is_void<_Tp>>::value>
>    struct __add_pointer_helper
>    { typedef _Tp type; };
>
>  template<typename _Tp>
>    struct __add_pointer_helper<_Tp, true>
>    { typedef typename remove_reference<_Tp>::type* type; };
>
>  template<typename _Tp>
>    struct add_pointer
>    : public __add_pointer_helper<_Tp>
>    { };
>
>
>
>  template<typename _Tp>
>    using remove_pointer_t = typename remove_pointer<_Tp>::type;
>
>
>  template<typename _Tp>
>    using add_pointer_t = typename add_pointer<_Tp>::type;
>
>
>  template<std::size_t _Len>
>    struct __aligned_storage_msa
>    {
>      union __type
>      {
> unsigned char __data[_Len];
> struct __attribute__((__aligned__)) { } __align;
>      };
>    };
># 1872 "/usr/include/c++/8/type_traits" 3
>  template<std::size_t _Len, std::size_t _Align =
>    __alignof__(typename __aligned_storage_msa<_Len>::__type)>
>    struct aligned_storage
>    {
>      union type
>      {
> unsigned char __data[_Len];
> struct __attribute__((__aligned__((_Align)))) { } __align;
>      };
>    };
>
>  template <typename... _Types>
>    struct __strictest_alignment
>    {
>      static const size_t _S_alignment = 0;
>      static const size_t _S_size = 0;
>    };
>
>  template <typename _Tp, typename... _Types>
>    struct __strictest_alignment<_Tp, _Types...>
>    {
>      static const size_t _S_alignment =
>        alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment
> ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment;
>      static const size_t _S_size =
>        sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size
> ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size;
>    };
># 1911 "/usr/include/c++/8/type_traits" 3
>  template <size_t _Len, typename... _Types>
>    struct aligned_union
>    {
>    private:
>      static_assert(sizeof...(_Types) != 0, "At least one type is required");
>
>      using __strictest = __strictest_alignment<_Types...>;
>      static const size_t _S_len = _Len > __strictest::_S_size
> ? _Len : __strictest::_S_size;
>    public:
>
>      static const size_t alignment_value = __strictest::_S_alignment;
>
>      typedef typename aligned_storage<_S_len, alignment_value>::type type;
>    };
>
>  template <size_t _Len, typename... _Types>
>    const size_t aligned_union<_Len, _Types...>::alignment_value;
>
>
>
>  template<typename _Up,
>    bool _IsArray = is_array<_Up>::value,
>    bool _IsFunction = is_function<_Up>::value>
>    struct __decay_selector;
>
>
>  template<typename _Up>
>    struct __decay_selector<_Up, false, false>
>    { typedef typename remove_cv<_Up>::type __type; };
>
>  template<typename _Up>
>    struct __decay_selector<_Up, true, false>
>    { typedef typename remove_extent<_Up>::type* __type; };
>
>  template<typename _Up>
>    struct __decay_selector<_Up, false, true>
>    { typedef typename add_pointer<_Up>::type __type; };
>
>
>  template<typename _Tp>
>    class decay
>    {
>      typedef typename remove_reference<_Tp>::type __remove_type;
>
>    public:
>      typedef typename __decay_selector<__remove_type>::__type type;
>    };
>
>  template<typename _Tp>
>    class reference_wrapper;
>
>
>  template<typename _Tp>
>    struct __strip_reference_wrapper
>    {
>      typedef _Tp __type;
>    };
>
>  template<typename _Tp>
>    struct __strip_reference_wrapper<reference_wrapper<_Tp> >
>    {
>      typedef _Tp& __type;
>    };
>
>  template<typename _Tp>
>    struct __decay_and_strip
>    {
>      typedef typename __strip_reference_wrapper<
> typename decay<_Tp>::type>::__type __type;
>    };
>
>
>
>
>  template<bool, typename _Tp = void>
>    struct enable_if
>    { };
>
>
>  template<typename _Tp>
>    struct enable_if<true, _Tp>
>    { typedef _Tp type; };
>
>  template<typename... _Cond>
>    using _Require = typename enable_if<__and_<_Cond...>::value>::type;
>
>
>
>  template<bool _Cond, typename _Iftrue, typename _Iffalse>
>    struct conditional
>    { typedef _Iftrue type; };
>
>
>  template<typename _Iftrue, typename _Iffalse>
>    struct conditional<false, _Iftrue, _Iffalse>
>    { typedef _Iffalse type; };
>
>
>  template<typename... _Tp>
>    struct common_type;
>
>
>
>  struct __do_common_type_impl
>  {
>    template<typename _Tp, typename _Up>
>      static __success_type<typename decay<decltype
>       (true ? std::declval<_Tp>()
>        : std::declval<_Up>())>::type> _S_test(int);
>
>    template<typename, typename>
>      static __failure_type _S_test(...);
>  };
>
>  template<typename _Tp, typename _Up>
>    struct __common_type_impl
>    : private __do_common_type_impl
>    {
>      typedef decltype(_S_test<_Tp, _Up>(0)) type;
>    };
>
>  struct __do_member_type_wrapper
>  {
>    template<typename _Tp>
>      static __success_type<typename _Tp::type> _S_test(int);
>
>    template<typename>
>      static __failure_type _S_test(...);
>  };
>
>  template<typename _Tp>
>    struct __member_type_wrapper
>    : private __do_member_type_wrapper
>    {
>      typedef decltype(_S_test<_Tp>(0)) type;
>    };
>
>  template<typename _CTp, typename... _Args>
>    struct __expanded_common_type_wrapper
>    {
>      typedef common_type<typename _CTp::type, _Args...> type;
>    };
>
>  template<typename... _Args>
>    struct __expanded_common_type_wrapper<__failure_type, _Args...>
>    { typedef __failure_type type; };
>
>  template<typename _Tp>
>    struct common_type<_Tp>
>    { typedef typename decay<_Tp>::type type; };
>
>  template<typename _Tp, typename _Up>
>    struct common_type<_Tp, _Up>
>    : public __common_type_impl<_Tp, _Up>::type
>    { };
>
>  template<typename _Tp, typename _Up, typename... _Vp>
>    struct common_type<_Tp, _Up, _Vp...>
>    : public __expanded_common_type_wrapper<typename __member_type_wrapper<
>               common_type<_Tp, _Up>>::type, _Vp...>::type
>    { };
>
>
>  template<typename _Tp>
>    struct underlying_type
>    {
>      typedef __underlying_type(_Tp) type;
>    };
>
>  template<typename _Tp>
>    struct __declval_protector
>    {
>      static const bool __stop = false;
>    };
>
>  template<typename _Tp>
>    auto declval() noexcept -> decltype(__declval<_Tp>(0))
>    {
>      static_assert(__declval_protector<_Tp>::__stop,
>      "declval() must not be used!");
>      return __declval<_Tp>(0);
>    }
>
>
>  template<typename _Signature>
>    class result_of;
>
>
>
>
>
>  struct __invoke_memfun_ref { };
>  struct __invoke_memfun_deref { };
>  struct __invoke_memobj_ref { };
>  struct __invoke_memobj_deref { };
>  struct __invoke_other { };
>
>
>  template<typename _Tp, typename _Tag>
>    struct __result_of_success : __success_type<_Tp>
>    { using __invoke_type = _Tag; };
>
>
>  struct __result_of_memfun_ref_impl
>  {
>    template<typename _Fp, typename _Tp1, typename... _Args>
>      static __result_of_success<decltype(
>      (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...)
>      ), __invoke_memfun_ref> _S_test(int);
>
>    template<typename...>
>      static __failure_type _S_test(...);
>  };
>
>  template<typename _MemPtr, typename _Arg, typename... _Args>
>    struct __result_of_memfun_ref
>    : private __result_of_memfun_ref_impl
>    {
>      typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
>    };
>
>
>  struct __result_of_memfun_deref_impl
>  {
>    template<typename _Fp, typename _Tp1, typename... _Args>
>      static __result_of_success<decltype(
>      ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...)
>      ), __invoke_memfun_deref> _S_test(int);
>
>    template<typename...>
>      static __failure_type _S_test(...);
>  };
>
>  template<typename _MemPtr, typename _Arg, typename... _Args>
>    struct __result_of_memfun_deref
>    : private __result_of_memfun_deref_impl
>    {
>      typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
>    };
>
>
>  struct __result_of_memobj_ref_impl
>  {
>    template<typename _Fp, typename _Tp1>
>      static __result_of_success<decltype(
>      std::declval<_Tp1>().*std::declval<_Fp>()
>      ), __invoke_memobj_ref> _S_test(int);
>
>    template<typename, typename>
>      static __failure_type _S_test(...);
>  };
>
>  template<typename _MemPtr, typename _Arg>
>    struct __result_of_memobj_ref
>    : private __result_of_memobj_ref_impl
>    {
>      typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
>    };
>
>
>  struct __result_of_memobj_deref_impl
>  {
>    template<typename _Fp, typename _Tp1>
>      static __result_of_success<decltype(
>      (*std::declval<_Tp1>()).*std::declval<_Fp>()
>      ), __invoke_memobj_deref> _S_test(int);
>
>    template<typename, typename>
>      static __failure_type _S_test(...);
>  };
>
>  template<typename _MemPtr, typename _Arg>
>    struct __result_of_memobj_deref
>    : private __result_of_memobj_deref_impl
>    {
>      typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
>    };
>
>  template<typename _MemPtr, typename _Arg>
>    struct __result_of_memobj;
>
>  template<typename _Res, typename _Class, typename _Arg>
>    struct __result_of_memobj<_Res _Class::*, _Arg>
>    {
>      typedef typename remove_cv<typename remove_reference<
>        _Arg>::type>::type _Argval;
>      typedef _Res _Class::* _MemPtr;
>      typedef typename conditional<__or_<is_same<_Argval, _Class>,
>        is_base_of<_Class, _Argval>>::value,
>        __result_of_memobj_ref<_MemPtr, _Arg>,
>        __result_of_memobj_deref<_MemPtr, _Arg>
>      >::type::type type;
>    };
>
>  template<typename _MemPtr, typename _Arg, typename... _Args>
>    struct __result_of_memfun;
>
>  template<typename _Res, typename _Class, typename _Arg, typename... _Args>
>    struct __result_of_memfun<_Res _Class::*, _Arg, _Args...>
>    {
>      typedef typename remove_cv<typename remove_reference<
>        _Arg>::type>::type _Argval;
>      typedef _Res _Class::* _MemPtr;
>      typedef typename conditional<__or_<is_same<_Argval, _Class>,
>        is_base_of<_Class, _Argval>>::value,
>        __result_of_memfun_ref<_MemPtr, _Arg, _Args...>,
>        __result_of_memfun_deref<_MemPtr, _Arg, _Args...>
>      >::type::type type;
>    };
>
>
>
>
>
>
>  template<typename _Tp, typename _Up = typename decay<_Tp>::type>
>    struct __inv_unwrap
>    {
>      using type = _Tp;
>    };
>
>  template<typename _Tp, typename _Up>
>    struct __inv_unwrap<_Tp, reference_wrapper<_Up>>
>    {
>      using type = _Up&;
>    };
>
>  template<bool, bool, typename _Functor, typename... _ArgTypes>
>    struct __result_of_impl
>    {
>      typedef __failure_type type;
>    };
>
>  template<typename _MemPtr, typename _Arg>
>    struct __result_of_impl<true, false, _MemPtr, _Arg>
>    : public __result_of_memobj<typename decay<_MemPtr>::type,
>    typename __inv_unwrap<_Arg>::type>
>    { };
>
>  template<typename _MemPtr, typename _Arg, typename... _Args>
>    struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...>
>    : public __result_of_memfun<typename decay<_MemPtr>::type,
>    typename __inv_unwrap<_Arg>::type, _Args...>
>    { };
>
>
>  struct __result_of_other_impl
>  {
>    template<typename _Fn, typename... _Args>
>      static __result_of_success<decltype(
>      std::declval<_Fn>()(std::declval<_Args>()...)
>      ), __invoke_other> _S_test(int);
>
>    template<typename...>
>      static __failure_type _S_test(...);
>  };
>
>  template<typename _Functor, typename... _ArgTypes>
>    struct __result_of_impl<false, false, _Functor, _ArgTypes...>
>    : private __result_of_other_impl
>    {
>      typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type;
>    };
>
>
>  template<typename _Functor, typename... _ArgTypes>
>    struct __invoke_result
>    : public __result_of_impl<
>        is_member_object_pointer<
>          typename remove_reference<_Functor>::type
>        >::value,
>        is_member_function_pointer<
>          typename remove_reference<_Functor>::type
>        >::value,
> _Functor, _ArgTypes...
>      >::type
>    { };
>
>  template<typename _Functor, typename... _ArgTypes>
>    struct result_of<_Functor(_ArgTypes...)>
>    : public __invoke_result<_Functor, _ArgTypes...>
>    { };
>
>
>
>  template<size_t _Len, size_t _Align =
>     __alignof__(typename __aligned_storage_msa<_Len>::__type)>
>    using aligned_storage_t = typename aligned_storage<_Len, _Align>::type;
>
>  template <size_t _Len, typename... _Types>
>    using aligned_union_t = typename aligned_union<_Len, _Types...>::type;
>
>
>  template<typename _Tp>
>    using decay_t = typename decay<_Tp>::type;
>
>
>  template<bool _Cond, typename _Tp = void>
>    using enable_if_t = typename enable_if<_Cond, _Tp>::type;
>
>
>  template<bool _Cond, typename _Iftrue, typename _Iffalse>
>    using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type;
>
>
>  template<typename... _Tp>
>    using common_type_t = typename common_type<_Tp...>::type;
>
>
>  template<typename _Tp>
>    using underlying_type_t = typename underlying_type<_Tp>::type;
>
>
>  template<typename _Tp>
>    using result_of_t = typename result_of<_Tp>::type;
>
>
>  template<typename...> using __void_t = void;
>
>
>
>
>  template<typename...> using void_t = void;
>
>
>
>  template<typename _Default, typename _AlwaysVoid,
>    template<typename...> class _Op, typename... _Args>
>    struct __detector
>    {
>      using value_t = false_type;
>      using type = _Default;
>    };
>
>
>  template<typename _Default, template<typename...> class _Op,
>     typename... _Args>
>    struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...>
>    {
>      using value_t = true_type;
>      using type = _Op<_Args...>;
>    };
>
>
>  template<typename _Default, template<typename...> class _Op,
>    typename... _Args>
>    using __detected_or = __detector<_Default, void, _Op, _Args...>;
>
>
>  template<typename _Default, template<typename...> class _Op,
>    typename... _Args>
>    using __detected_or_t
>      = typename __detected_or<_Default, _Op, _Args...>::type;
># 2382 "/usr/include/c++/8/type_traits" 3
>  template <typename _Tp>
>    struct __is_swappable;
>
>  template <typename _Tp>
>    struct __is_nothrow_swappable;
>
>  template<typename... _Elements>
>    class tuple;
>
>  template<typename>
>    struct __is_tuple_like_impl : false_type
>    { };
>
>  template<typename... _Tps>
>    struct __is_tuple_like_impl<tuple<_Tps...>> : true_type
>    { };
>
>
>  template<typename _Tp>
>    struct __is_tuple_like
>    : public __is_tuple_like_impl<typename remove_cv<
>      typename remove_reference<_Tp>::type>::type>::type
>    { };
>
>  template<typename _Tp>
>    inline
>    typename enable_if<__and_<__not_<__is_tuple_like<_Tp>>,
>         is_move_constructible<_Tp>,
>         is_move_assignable<_Tp>>::value>::type
>    swap(_Tp&, _Tp&)
>    noexcept(__and_<is_nothrow_move_constructible<_Tp>,
>             is_nothrow_move_assignable<_Tp>>::value);
>
>  template<typename _Tp, size_t _Nm>
>    inline
>    typename enable_if<__is_swappable<_Tp>::value>::type
>    swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
>    noexcept(__is_nothrow_swappable<_Tp>::value);
>
>  namespace __swappable_details {
>    using std::swap;
>
>    struct __do_is_swappable_impl
>    {
>      template<typename _Tp, typename
>               = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))>
>        static true_type __test(int);
>
>      template<typename>
>        static false_type __test(...);
>    };
>
>    struct __do_is_nothrow_swappable_impl
>    {
>      template<typename _Tp>
>        static __bool_constant<
>          noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))
>        > __test(int);
>
>      template<typename>
>        static false_type __test(...);
>    };
>
>  }
>
>  template<typename _Tp>
>    struct __is_swappable_impl
>    : public __swappable_details::__do_is_swappable_impl
>    {
>      typedef decltype(__test<_Tp>(0)) type;
>    };
>
>  template<typename _Tp>
>    struct __is_nothrow_swappable_impl
>    : public __swappable_details::__do_is_nothrow_swappable_impl
>    {
>      typedef decltype(__test<_Tp>(0)) type;
>    };
>
>  template<typename _Tp>
>    struct __is_swappable
>    : public __is_swappable_impl<_Tp>::type
>    { };
>
>  template<typename _Tp>
>    struct __is_nothrow_swappable
>    : public __is_nothrow_swappable_impl<_Tp>::type
>    { };
>
>
>
>
>
>
>  template<typename _Tp>
>    struct is_swappable
>    : public __is_swappable_impl<_Tp>::type
>    { };
>
>
>  template<typename _Tp>
>    struct is_nothrow_swappable
>    : public __is_nothrow_swappable_impl<_Tp>::type
>    { };
>
>
>
>  template<typename _Tp>
>    constexpr bool is_swappable_v =
>      is_swappable<_Tp>::value;
>
>
>  template<typename _Tp>
>    constexpr bool is_nothrow_swappable_v =
>      is_nothrow_swappable<_Tp>::value;
>
>
>  namespace __swappable_with_details {
>    using std::swap;
>
>    struct __do_is_swappable_with_impl
>    {
>      template<typename _Tp, typename _Up, typename
>               = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())),
>               typename
>               = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))>
>        static true_type __test(int);
>
>      template<typename, typename>
>        static false_type __test(...);
>    };
>
>    struct __do_is_nothrow_swappable_with_impl
>    {
>      template<typename _Tp, typename _Up>
>        static __bool_constant<
>          noexcept(swap(std::declval<_Tp>(), std::declval<_Up>()))
>          &&
>          noexcept(swap(std::declval<_Up>(), std::declval<_Tp>()))
>        > __test(int);
>
>      template<typename, typename>
>        static false_type __test(...);
>    };
>
>  }
>
>  template<typename _Tp, typename _Up>
>    struct __is_swappable_with_impl
>    : public __swappable_with_details::__do_is_swappable_with_impl
>    {
>      typedef decltype(__test<_Tp, _Up>(0)) type;
>    };
>
>
>  template<typename _Tp>
>    struct __is_swappable_with_impl<_Tp&, _Tp&>
>    : public __swappable_details::__do_is_swappable_impl
>    {
>      typedef decltype(__test<_Tp&>(0)) type;
>    };
>
>  template<typename _Tp, typename _Up>
>    struct __is_nothrow_swappable_with_impl
>    : public __swappable_with_details::__do_is_nothrow_swappable_with_impl
>    {
>      typedef decltype(__test<_Tp, _Up>(0)) type;
>    };
>
>
>  template<typename _Tp>
>    struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&>
>    : public __swappable_details::__do_is_nothrow_swappable_impl
>    {
>      typedef decltype(__test<_Tp&>(0)) type;
>    };
>
>
>  template<typename _Tp, typename _Up>
>    struct is_swappable_with
>    : public __is_swappable_with_impl<_Tp, _Up>::type
>    { };
>
>
>  template<typename _Tp, typename _Up>
>    struct is_nothrow_swappable_with
>    : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type
>    { };
>
>
>
>  template<typename _Tp, typename _Up>
>    constexpr bool is_swappable_with_v =
>      is_swappable_with<_Tp, _Up>::value;
>
>
>  template<typename _Tp, typename _Up>
>    constexpr bool is_nothrow_swappable_with_v =
>      is_nothrow_swappable_with<_Tp, _Up>::value;
>
>
>
>
>
>
>  template<typename _Result, typename _Ret, typename = void>
>    struct __is_invocable_impl : false_type { };
>
>  template<typename _Result, typename _Ret>
>    struct __is_invocable_impl<_Result, _Ret, __void_t<typename _Result::type>>
>    : __or_<is_void<_Ret>, is_convertible<typename _Result::type, _Ret>>::type
>    { };
>
>  template<typename _Fn, typename... _ArgTypes>
>    struct __is_invocable
>    : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
>    { };
>
>  template<typename _Fn, typename _Tp, typename... _Args>
>    constexpr bool __call_is_nt(__invoke_memfun_ref)
>    {
>      using _Up = typename __inv_unwrap<_Tp>::type;
>      return noexcept((std::declval<_Up>().*std::declval<_Fn>())(
>     std::declval<_Args>()...));
>    }
>
>  template<typename _Fn, typename _Tp, typename... _Args>
>    constexpr bool __call_is_nt(__invoke_memfun_deref)
>    {
>      return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())(
>     std::declval<_Args>()...));
>    }
>
>  template<typename _Fn, typename _Tp>
>    constexpr bool __call_is_nt(__invoke_memobj_ref)
>    {
>      using _Up = typename __inv_unwrap<_Tp>::type;
>      return noexcept(std::declval<_Up>().*std::declval<_Fn>());
>    }
>
>  template<typename _Fn, typename _Tp>
>    constexpr bool __call_is_nt(__invoke_memobj_deref)
>    {
>      return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>());
>    }
>
>  template<typename _Fn, typename... _Args>
>    constexpr bool __call_is_nt(__invoke_other)
>    {
>      return noexcept(std::declval<_Fn>()(std::declval<_Args>()...));
>    }
>
>  template<typename _Result, typename _Fn, typename... _Args>
>    struct __call_is_nothrow
>    : __bool_constant<
> std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{})
>      >
>    { };
>
>  template<typename _Fn, typename... _Args>
>    using __call_is_nothrow_
>      = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>;
>
>
>  template<typename _Fn, typename... _Args>
>    struct __is_nothrow_invocable
>    : __and_<__is_invocable<_Fn, _Args...>,
>             __call_is_nothrow_<_Fn, _Args...>>::type
>    { };
>
>  struct __nonesuch {
>    __nonesuch() = delete;
>    ~__nonesuch() = delete;
>    __nonesuch(__nonesuch const&) = delete;
>    void operator=(__nonesuch const&) = delete;
>  };
># 2947 "/usr/include/c++/8/type_traits" 3
>
>}
># 56 "/usr/include/c++/8/bits/move.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 72 "/usr/include/c++/8/bits/move.h" 3
>  template<typename _Tp>
>    constexpr _Tp&&
>    forward(typename std::remove_reference<_Tp>::type& __t) noexcept
>    { return static_cast<_Tp&&>(__t); }
>
>
>
>
>
>
>
>  template<typename _Tp>
>    constexpr _Tp&&
>    forward(typename std::remove_reference<_Tp>::type&& __t) noexcept
>    {
>      static_assert(!std::is_lvalue_reference<_Tp>::value, "template argument"
>      " substituting _Tp is an lvalue reference type");
>      return static_cast<_Tp&&>(__t);
>    }
>
>
>
>
>
>
>  template<typename _Tp>
>    constexpr typename std::remove_reference<_Tp>::type&&
>    move(_Tp&& __t) noexcept
>    { return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); }
>
>
>  template<typename _Tp>
>    struct __move_if_noexcept_cond
>    : public __and_<__not_<is_nothrow_move_constructible<_Tp>>,
>                    is_copy_constructible<_Tp>>::type { };
># 116 "/usr/include/c++/8/bits/move.h" 3
>  template<typename _Tp>
>    constexpr typename
>    conditional<__move_if_noexcept_cond<_Tp>::value, const _Tp&, _Tp&&>::type
>    move_if_noexcept(_Tp& __x) noexcept
>    { return std::move(__x); }
># 136 "/usr/include/c++/8/bits/move.h" 3
>  template<typename _Tp>
>    inline _Tp*
>    addressof(_Tp& __r) noexcept
>    { return std::__addressof(__r); }
>
>
>
>  template<typename _Tp>
>    const _Tp* addressof(const _Tp&&) = delete;
>
>
>  template <typename _Tp, typename _Up = _Tp>
>    inline _Tp
>    __exchange(_Tp& __obj, _Up&& __new_val)
>    {
>      _Tp __old_val = std::move(__obj);
>      __obj = std::forward<_Up>(__new_val);
>      return __old_val;
>    }
># 176 "/usr/include/c++/8/bits/move.h" 3
>  template<typename _Tp>
>    inline
>
>    typename enable_if<__and_<__not_<__is_tuple_like<_Tp>>,
>         is_move_constructible<_Tp>,
>         is_move_assignable<_Tp>>::value>::type
>    swap(_Tp& __a, _Tp& __b)
>    noexcept(__and_<is_nothrow_move_constructible<_Tp>,
>             is_nothrow_move_assignable<_Tp>>::value)
>
>
>
>
>    {
>
>     
>
>      _Tp __tmp = std::move(__a);
>      __a = std::move(__b);
>      __b = std::move(__tmp);
>    }
>
>
>
>
>  template<typename _Tp, size_t _Nm>
>    inline
>
>    typename enable_if<__is_swappable<_Tp>::value>::type
>    swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
>    noexcept(__is_nothrow_swappable<_Tp>::value)
>
>
>
>
>    {
>      for (size_t __n = 0; __n < _Nm; ++__n)
> swap(__a[__n], __b[__n]);
>    }
>
>
>
>}
># 41 "/usr/include/c++/8/bits/nested_exception.h" 2 3
>
>extern "C++" {
>
>namespace std
>{
>
>
>
>
>
>
>  class nested_exception
>  {
>    exception_ptr _M_ptr;
>
>  public:
>    nested_exception() noexcept : _M_ptr(current_exception()) { }
>
>    nested_exception(const nested_exception&) noexcept = default;
>
>    nested_exception& operator=(const nested_exception&) noexcept = default;
>
>    virtual ~nested_exception() noexcept;
>
>    [[noreturn]]
>    void
>    rethrow_nested() const
>    {
>      if (_M_ptr)
> rethrow_exception(_M_ptr);
>      std::terminate();
>    }
>
>    exception_ptr
>    nested_ptr() const noexcept
>    { return _M_ptr; }
>  };
>
>  template<typename _Except>
>    struct _Nested_exception : public _Except, public nested_exception
>    {
>      explicit _Nested_exception(const _Except& __ex)
>      : _Except(__ex)
>      { }
>
>      explicit _Nested_exception(_Except&& __ex)
>      : _Except(static_cast<_Except&&>(__ex))
>      { }
>    };
>
>
>
>
>  template<typename _Tp>
>    [[noreturn]]
>    inline void
>    __throw_with_nested_impl(_Tp&& __t, true_type)
>    {
>      using _Up = typename remove_reference<_Tp>::type;
>      throw _Nested_exception<_Up>{std::forward<_Tp>(__t)};
>    }
>
>  template<typename _Tp>
>    [[noreturn]]
>    inline void
>    __throw_with_nested_impl(_Tp&& __t, false_type)
>    { throw std::forward<_Tp>(__t); }
>
>
>
>  template<typename _Tp>
>    [[noreturn]]
>    inline void
>    throw_with_nested(_Tp&& __t)
>    {
>      using _Up = typename decay<_Tp>::type;
>      using _CopyConstructible
> = __and_<is_copy_constructible<_Up>, is_move_constructible<_Up>>;
>      static_assert(_CopyConstructible::value,
>   "throw_with_nested argument must be CopyConstructible");
>      using __nest = __and_<is_class<_Up>, __bool_constant<!__is_final(_Up)>,
>       __not_<is_base_of<nested_exception, _Up>>>;
>      std::__throw_with_nested_impl(std::forward<_Tp>(__t), __nest{});
>    }
>
>
>  template<typename _Tp>
>    using __rethrow_if_nested_cond = typename enable_if<
>      __and_<is_polymorphic<_Tp>,
>      __or_<__not_<is_base_of<nested_exception, _Tp>>,
>     is_convertible<_Tp*, nested_exception*>>>::value
>    >::type;
>
>
>  template<typename _Ex>
>    inline __rethrow_if_nested_cond<_Ex>
>    __rethrow_if_nested_impl(const _Ex* __ptr)
>    {
>      if (auto __ne_ptr = dynamic_cast<const nested_exception*>(__ptr))
> __ne_ptr->rethrow_nested();
>    }
>
>
>  inline void
>  __rethrow_if_nested_impl(const void*)
>  { }
>
>
>  template<typename _Ex>
>    inline void
>    rethrow_if_nested(const _Ex& __ex)
>    { std::__rethrow_if_nested_impl(std::__addressof(__ex)); }
>
>
>}
>
>}
>
>
>
>#pragma GCC visibility pop
># 145 "/usr/include/c++/8/exception" 2 3
># 40 "/usr/include/c++/8/ios" 2 3
># 1 "/usr/include/c++/8/bits/char_traits.h" 1 3
># 37 "/usr/include/c++/8/bits/char_traits.h" 3
>       
># 38 "/usr/include/c++/8/bits/char_traits.h" 3
>
># 1 "/usr/include/c++/8/bits/stl_algobase.h" 1 3
># 60 "/usr/include/c++/8/bits/stl_algobase.h" 3
># 1 "/usr/include/c++/8/bits/functexcept.h" 1 3
># 42 "/usr/include/c++/8/bits/functexcept.h" 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>  void
>  __throw_bad_exception(void) __attribute__((__noreturn__));
>
>
>  void
>  __throw_bad_alloc(void) __attribute__((__noreturn__));
>
>
>  void
>  __throw_bad_cast(void) __attribute__((__noreturn__));
>
>  void
>  __throw_bad_typeid(void) __attribute__((__noreturn__));
>
>
>  void
>  __throw_logic_error(const char*) __attribute__((__noreturn__));
>
>  void
>  __throw_domain_error(const char*) __attribute__((__noreturn__));
>
>  void
>  __throw_invalid_argument(const char*) __attribute__((__noreturn__));
>
>  void
>  __throw_length_error(const char*) __attribute__((__noreturn__));
>
>  void
>  __throw_out_of_range(const char*) __attribute__((__noreturn__));
>
>  void
>  __throw_out_of_range_fmt(const char*, ...) __attribute__((__noreturn__))
>    __attribute__((__format__(__gnu_printf__, 1, 2)));
>
>  void
>  __throw_runtime_error(const char*) __attribute__((__noreturn__));
>
>  void
>  __throw_range_error(const char*) __attribute__((__noreturn__));
>
>  void
>  __throw_overflow_error(const char*) __attribute__((__noreturn__));
>
>  void
>  __throw_underflow_error(const char*) __attribute__((__noreturn__));
>
>
>  void
>  __throw_ios_failure(const char*) __attribute__((__noreturn__));
>
>  void
>  __throw_system_error(int) __attribute__((__noreturn__));
>
>  void
>  __throw_future_error(int) __attribute__((__noreturn__));
>
>
>  void
>  __throw_bad_function_call() __attribute__((__noreturn__));
>
>
>}
># 61 "/usr/include/c++/8/bits/stl_algobase.h" 2 3
># 1 "/usr/include/c++/8/bits/cpp_type_traits.h" 1 3
># 35 "/usr/include/c++/8/bits/cpp_type_traits.h" 3
>       
># 36 "/usr/include/c++/8/bits/cpp_type_traits.h" 3
># 67 "/usr/include/c++/8/bits/cpp_type_traits.h" 3
>extern "C++" {
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  struct __true_type { };
>  struct __false_type { };
>
>  template<bool>
>    struct __truth_type
>    { typedef __false_type __type; };
>
>  template<>
>    struct __truth_type<true>
>    { typedef __true_type __type; };
>
>
>
>  template<class _Sp, class _Tp>
>    struct __traitor
>    {
>      enum { __value = bool(_Sp::__value) || bool(_Tp::__value) };
>      typedef typename __truth_type<__value>::__type __type;
>    };
>
>
>  template<typename, typename>
>    struct __are_same
>    {
>      enum { __value = 0 };
>      typedef __false_type __type;
>    };
>
>  template<typename _Tp>
>    struct __are_same<_Tp, _Tp>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>
>  template<typename _Tp>
>    struct __is_void
>    {
>      enum { __value = 0 };
>      typedef __false_type __type;
>    };
>
>  template<>
>    struct __is_void<void>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>
>
>
>  template<typename _Tp>
>    struct __is_integer
>    {
>      enum { __value = 0 };
>      typedef __false_type __type;
>    };
>
>
>
>
>
>  template<>
>    struct __is_integer<bool>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_integer<char>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_integer<signed char>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_integer<unsigned char>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>
>  template<>
>    struct __is_integer<wchar_t>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>
>
>  template<>
>    struct __is_integer<char16_t>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_integer<char32_t>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>
>  template<>
>    struct __is_integer<short>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_integer<unsigned short>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_integer<int>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_integer<unsigned int>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_integer<long>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_integer<unsigned long>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_integer<long long>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_integer<unsigned long long>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
># 261 "/usr/include/c++/8/bits/cpp_type_traits.h" 3
>template<> struct __is_integer<__int128> { enum { __value = 1 }; typedef __true_type __type; }; template<> struct __is_integer<unsigned __int128> { enum { __value = 1 }; typedef __true_type __type; };
># 278 "/usr/include/c++/8/bits/cpp_type_traits.h" 3
>  template<typename _Tp>
>    struct __is_floating
>    {
>      enum { __value = 0 };
>      typedef __false_type __type;
>    };
>
>
>  template<>
>    struct __is_floating<float>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_floating<double>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_floating<long double>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>
>
>
>  template<typename _Tp>
>    struct __is_pointer
>    {
>      enum { __value = 0 };
>      typedef __false_type __type;
>    };
>
>  template<typename _Tp>
>    struct __is_pointer<_Tp*>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>
>
>
>  template<typename _Tp>
>    struct __is_arithmetic
>    : public __traitor<__is_integer<_Tp>, __is_floating<_Tp> >
>    { };
>
>
>
>
>  template<typename _Tp>
>    struct __is_scalar
>    : public __traitor<__is_arithmetic<_Tp>, __is_pointer<_Tp> >
>    { };
>
>
>
>
>  template<typename _Tp>
>    struct __is_char
>    {
>      enum { __value = 0 };
>      typedef __false_type __type;
>    };
>
>  template<>
>    struct __is_char<char>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>
>  template<>
>    struct __is_char<wchar_t>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>
>  template<typename _Tp>
>    struct __is_byte
>    {
>      enum { __value = 0 };
>      typedef __false_type __type;
>    };
>
>  template<>
>    struct __is_byte<char>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_byte<signed char>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<>
>    struct __is_byte<unsigned char>
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>
>
>
>  template<typename _Tp>
>    struct __is_move_iterator
>    {
>      enum { __value = 0 };
>      typedef __false_type __type;
>    };
>
>
>
>  template<typename _Iterator>
>    inline _Iterator
>    __miter_base(_Iterator __it)
>    { return __it; }
>
>
>}
>}
># 62 "/usr/include/c++/8/bits/stl_algobase.h" 2 3
># 1 "/usr/include/c++/8/ext/type_traits.h" 1 3
># 32 "/usr/include/c++/8/ext/type_traits.h" 3
>       
># 33 "/usr/include/c++/8/ext/type_traits.h" 3
>
>
>
>
>extern "C++" {
>
>namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>  template<bool, typename>
>    struct __enable_if
>    { };
>
>  template<typename _Tp>
>    struct __enable_if<true, _Tp>
>    { typedef _Tp __type; };
>
>
>
>  template<bool _Cond, typename _Iftrue, typename _Iffalse>
>    struct __conditional_type
>    { typedef _Iftrue __type; };
>
>  template<typename _Iftrue, typename _Iffalse>
>    struct __conditional_type<false, _Iftrue, _Iffalse>
>    { typedef _Iffalse __type; };
>
>
>
>  template<typename _Tp>
>    struct __add_unsigned
>    {
>    private:
>      typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
>
>    public:
>      typedef typename __if_type::__type __type;
>    };
>
>  template<>
>    struct __add_unsigned<char>
>    { typedef unsigned char __type; };
>
>  template<>
>    struct __add_unsigned<signed char>
>    { typedef unsigned char __type; };
>
>  template<>
>    struct __add_unsigned<short>
>    { typedef unsigned short __type; };
>
>  template<>
>    struct __add_unsigned<int>
>    { typedef unsigned int __type; };
>
>  template<>
>    struct __add_unsigned<long>
>    { typedef unsigned long __type; };
>
>  template<>
>    struct __add_unsigned<long long>
>    { typedef unsigned long long __type; };
>
>
>  template<>
>    struct __add_unsigned<bool>;
>
>  template<>
>    struct __add_unsigned<wchar_t>;
>
>
>
>  template<typename _Tp>
>    struct __remove_unsigned
>    {
>    private:
>      typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
>
>    public:
>      typedef typename __if_type::__type __type;
>    };
>
>  template<>
>    struct __remove_unsigned<char>
>    { typedef signed char __type; };
>
>  template<>
>    struct __remove_unsigned<unsigned char>
>    { typedef signed char __type; };
>
>  template<>
>    struct __remove_unsigned<unsigned short>
>    { typedef short __type; };
>
>  template<>
>    struct __remove_unsigned<unsigned int>
>    { typedef int __type; };
>
>  template<>
>    struct __remove_unsigned<unsigned long>
>    { typedef long __type; };
>
>  template<>
>    struct __remove_unsigned<unsigned long long>
>    { typedef long long __type; };
>
>
>  template<>
>    struct __remove_unsigned<bool>;
>
>  template<>
>    struct __remove_unsigned<wchar_t>;
>
>
>
>  template<typename _Type>
>    inline bool
>    __is_null_pointer(_Type* __ptr)
>    { return __ptr == 0; }
>
>  template<typename _Type>
>    inline bool
>    __is_null_pointer(_Type)
>    { return false; }
>
>
>  inline bool
>  __is_null_pointer(std::nullptr_t)
>  { return true; }
>
>
>
>  template<typename _Tp, bool = std::__is_integer<_Tp>::__value>
>    struct __promote
>    { typedef double __type; };
>
>
>
>
>  template<typename _Tp>
>    struct __promote<_Tp, false>
>    { };
>
>  template<>
>    struct __promote<long double>
>    { typedef long double __type; };
>
>  template<>
>    struct __promote<double>
>    { typedef double __type; };
>
>  template<>
>    struct __promote<float>
>    { typedef float __type; };
>
>  template<typename _Tp, typename _Up,
>           typename _Tp2 = typename __promote<_Tp>::__type,
>           typename _Up2 = typename __promote<_Up>::__type>
>    struct __promote_2
>    {
>      typedef __typeof__(_Tp2() + _Up2()) __type;
>    };
>
>  template<typename _Tp, typename _Up, typename _Vp,
>           typename _Tp2 = typename __promote<_Tp>::__type,
>           typename _Up2 = typename __promote<_Up>::__type,
>           typename _Vp2 = typename __promote<_Vp>::__type>
>    struct __promote_3
>    {
>      typedef __typeof__(_Tp2() + _Up2() + _Vp2()) __type;
>    };
>
>  template<typename _Tp, typename _Up, typename _Vp, typename _Wp,
>           typename _Tp2 = typename __promote<_Tp>::__type,
>           typename _Up2 = typename __promote<_Up>::__type,
>           typename _Vp2 = typename __promote<_Vp>::__type,
>           typename _Wp2 = typename __promote<_Wp>::__type>
>    struct __promote_4
>    {
>      typedef __typeof__(_Tp2() + _Up2() + _Vp2() + _Wp2()) __type;
>    };
>
>
>}
>}
># 63 "/usr/include/c++/8/bits/stl_algobase.h" 2 3
># 1 "/usr/include/c++/8/ext/numeric_traits.h" 1 3
># 32 "/usr/include/c++/8/ext/numeric_traits.h" 3
>       
># 33 "/usr/include/c++/8/ext/numeric_traits.h" 3
>
>
>
>
>namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
>{
>
># 54 "/usr/include/c++/8/ext/numeric_traits.h" 3
>  template<typename _Value>
>    struct __numeric_traits_integer
>    {
>
>      static const _Value __min = (((_Value)(-1) < 0) ? (_Value)1 << (sizeof(_Value) * 8 - ((_Value)(-1) < 0)) : (_Value)0);
>      static const _Value __max = (((_Value)(-1) < 0) ? (((((_Value)1 << ((sizeof(_Value) * 8 - ((_Value)(-1) < 0)) - 1)) - 1) << 1) + 1) : ~(_Value)0);
>
>
>
>      static const bool __is_signed = ((_Value)(-1) < 0);
>      static const int __digits = (sizeof(_Value) * 8 - ((_Value)(-1) < 0));
>    };
>
>  template<typename _Value>
>    const _Value __numeric_traits_integer<_Value>::__min;
>
>  template<typename _Value>
>    const _Value __numeric_traits_integer<_Value>::__max;
>
>  template<typename _Value>
>    const bool __numeric_traits_integer<_Value>::__is_signed;
>
>  template<typename _Value>
>    const int __numeric_traits_integer<_Value>::__digits;
># 99 "/usr/include/c++/8/ext/numeric_traits.h" 3
>  template<typename _Value>
>    struct __numeric_traits_floating
>    {
>
>      static const int __max_digits10 = (2 + (std::__are_same<_Value, float>::__value ? 24 : std::__are_same<_Value, double>::__value ? 53 : 64) * 643L / 2136);
>
>
>      static const bool __is_signed = true;
>      static const int __digits10 = (std::__are_same<_Value, float>::__value ? 6 : std::__are_same<_Value, double>::__value ? 15 : 18);
>      static const int __max_exponent10 = (std::__are_same<_Value, float>::__value ? 38 : std::__are_same<_Value, double>::__value ? 308 : 4932);
>    };
>
>  template<typename _Value>
>    const int __numeric_traits_floating<_Value>::__max_digits10;
>
>  template<typename _Value>
>    const bool __numeric_traits_floating<_Value>::__is_signed;
>
>  template<typename _Value>
>    const int __numeric_traits_floating<_Value>::__digits10;
>
>  template<typename _Value>
>    const int __numeric_traits_floating<_Value>::__max_exponent10;
>
>  template<typename _Value>
>    struct __numeric_traits
>    : public __conditional_type<std::__is_integer<_Value>::__value,
>    __numeric_traits_integer<_Value>,
>    __numeric_traits_floating<_Value> >::__type
>    { };
>
>
>}
># 64 "/usr/include/c++/8/bits/stl_algobase.h" 2 3
># 1 "/usr/include/c++/8/bits/stl_pair.h" 1 3
># 65 "/usr/include/c++/8/bits/stl_pair.h" 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 76 "/usr/include/c++/8/bits/stl_pair.h" 3
>  struct piecewise_construct_t { explicit piecewise_construct_t() = default; };
>
>
>  constexpr piecewise_construct_t piecewise_construct =
>    piecewise_construct_t();
>
>
>  template<typename...>
>    class tuple;
>
>  template<std::size_t...>
>    struct _Index_tuple;
>
>
>
>
>
>
>  template <bool, typename _T1, typename _T2>
>    struct _PCC
>    {
>      template <typename _U1, typename _U2>
>      static constexpr bool _ConstructiblePair()
>      {
> return __and_<is_constructible<_T1, const _U1&>,
>        is_constructible<_T2, const _U2&>>::value;
>      }
>
>      template <typename _U1, typename _U2>
>      static constexpr bool _ImplicitlyConvertiblePair()
>      {
> return __and_<is_convertible<const _U1&, _T1>,
>        is_convertible<const _U2&, _T2>>::value;
>      }
>
>      template <typename _U1, typename _U2>
>      static constexpr bool _MoveConstructiblePair()
>      {
> return __and_<is_constructible<_T1, _U1&&>,
>        is_constructible<_T2, _U2&&>>::value;
>      }
>
>      template <typename _U1, typename _U2>
>      static constexpr bool _ImplicitlyMoveConvertiblePair()
>      {
> return __and_<is_convertible<_U1&&, _T1>,
>        is_convertible<_U2&&, _T2>>::value;
>      }
>
>      template <bool __implicit, typename _U1, typename _U2>
>      static constexpr bool _CopyMovePair()
>      {
> using __do_converts = __and_<is_convertible<const _U1&, _T1>,
>      is_convertible<_U2&&, _T2>>;
> using __converts = typename conditional<__implicit,
>           __do_converts,
>           __not_<__do_converts>>::type;
> return __and_<is_constructible<_T1, const _U1&>,
>        is_constructible<_T2, _U2&&>,
>        __converts
>        >::value;
>      }
>
>      template <bool __implicit, typename _U1, typename _U2>
>      static constexpr bool _MoveCopyPair()
>      {
> using __do_converts = __and_<is_convertible<_U1&&, _T1>,
>      is_convertible<const _U2&, _T2>>;
> using __converts = typename conditional<__implicit,
>           __do_converts,
>           __not_<__do_converts>>::type;
> return __and_<is_constructible<_T1, _U1&&>,
>        is_constructible<_T2, const _U2&&>,
>        __converts
>        >::value;
>      }
>  };
>
>  template <typename _T1, typename _T2>
>    struct _PCC<false, _T1, _T2>
>    {
>      template <typename _U1, typename _U2>
>      static constexpr bool _ConstructiblePair()
>      {
> return false;
>      }
>
>      template <typename _U1, typename _U2>
>      static constexpr bool _ImplicitlyConvertiblePair()
>      {
> return false;
>      }
>
>      template <typename _U1, typename _U2>
>      static constexpr bool _MoveConstructiblePair()
>      {
> return false;
>      }
>
>      template <typename _U1, typename _U2>
>      static constexpr bool _ImplicitlyMoveConvertiblePair()
>      {
> return false;
>      }
>  };
>
>
>
>
>  struct __nonesuch_no_braces : std::__nonesuch {
>    explicit __nonesuch_no_braces(const __nonesuch&) = delete;
>  };
># 197 "/usr/include/c++/8/bits/stl_pair.h" 3
>  template<typename _T1, typename _T2>
>    struct pair
>    {
>      typedef _T1 first_type;
>      typedef _T2 second_type;
>
>      _T1 first;
>      _T2 second;
>
>
>
>
>
>
>      template <typename _U1 = _T1,
>                typename _U2 = _T2,
>                typename enable_if<__and_<
>                                     __is_implicitly_default_constructible<_U1>,
>                                     __is_implicitly_default_constructible<_U2>>
>                                   ::value, bool>::type = true>
>
>      constexpr pair()
>      : first(), second() { }
>
>
>      template <typename _U1 = _T1,
>                typename _U2 = _T2,
>                typename enable_if<__and_<
>                       is_default_constructible<_U1>,
>                       is_default_constructible<_U2>,
>                       __not_<
>                         __and_<__is_implicitly_default_constructible<_U1>,
>                                __is_implicitly_default_constructible<_U2>>>>
>                                   ::value, bool>::type = false>
>      explicit constexpr pair()
>      : first(), second() { }
># 241 "/usr/include/c++/8/bits/stl_pair.h" 3
>      using _PCCP = _PCC<true, _T1, _T2>;
>
>      template<typename _U1 = _T1, typename _U2=_T2, typename
>        enable_if<_PCCP::template
>      _ConstructiblePair<_U1, _U2>()
>                  && _PCCP::template
>      _ImplicitlyConvertiblePair<_U1, _U2>(),
>                         bool>::type=true>
>      constexpr pair(const _T1& __a, const _T2& __b)
>      : first(__a), second(__b) { }
>
>       template<typename _U1 = _T1, typename _U2=_T2, typename
>  enable_if<_PCCP::template
>       _ConstructiblePair<_U1, _U2>()
>                   && !_PCCP::template
>       _ImplicitlyConvertiblePair<_U1, _U2>(),
>                         bool>::type=false>
>      explicit constexpr pair(const _T1& __a, const _T2& __b)
>      : first(__a), second(__b) { }
># 269 "/usr/include/c++/8/bits/stl_pair.h" 3
>      template <typename _U1, typename _U2>
>        using _PCCFP = _PCC<!is_same<_T1, _U1>::value
>       || !is_same<_T2, _U2>::value,
>       _T1, _T2>;
>
>      template<typename _U1, typename _U2, typename
>        enable_if<_PCCFP<_U1, _U2>::template
>      _ConstructiblePair<_U1, _U2>()
>                  && _PCCFP<_U1, _U2>::template
>      _ImplicitlyConvertiblePair<_U1, _U2>(),
>     bool>::type=true>
>        constexpr pair(const pair<_U1, _U2>& __p)
>        : first(__p.first), second(__p.second) { }
>
>      template<typename _U1, typename _U2, typename
>        enable_if<_PCCFP<_U1, _U2>::template
>      _ConstructiblePair<_U1, _U2>()
>    && !_PCCFP<_U1, _U2>::template
>      _ImplicitlyConvertiblePair<_U1, _U2>(),
>                         bool>::type=false>
> explicit constexpr pair(const pair<_U1, _U2>& __p)
> : first(__p.first), second(__p.second) { }
>
>      constexpr pair(const pair&) = default;
>      constexpr pair(pair&&) = default;
>
>
>      template<typename _U1, typename
>        enable_if<_PCCP::template
>      _MoveCopyPair<true, _U1, _T2>(),
>                         bool>::type=true>
>       constexpr pair(_U1&& __x, const _T2& __y)
>       : first(std::forward<_U1>(__x)), second(__y) { }
>
>      template<typename _U1, typename
>        enable_if<_PCCP::template
>      _MoveCopyPair<false, _U1, _T2>(),
>                         bool>::type=false>
>       explicit constexpr pair(_U1&& __x, const _T2& __y)
>       : first(std::forward<_U1>(__x)), second(__y) { }
>
>      template<typename _U2, typename
>        enable_if<_PCCP::template
>      _CopyMovePair<true, _T1, _U2>(),
>                         bool>::type=true>
>       constexpr pair(const _T1& __x, _U2&& __y)
>       : first(__x), second(std::forward<_U2>(__y)) { }
>
>      template<typename _U2, typename
>        enable_if<_PCCP::template
>      _CopyMovePair<false, _T1, _U2>(),
>                         bool>::type=false>
>       explicit pair(const _T1& __x, _U2&& __y)
>       : first(__x), second(std::forward<_U2>(__y)) { }
>
>      template<typename _U1, typename _U2, typename
>        enable_if<_PCCP::template
>      _MoveConstructiblePair<_U1, _U2>()
>     && _PCCP::template
>      _ImplicitlyMoveConvertiblePair<_U1, _U2>(),
>                         bool>::type=true>
> constexpr pair(_U1&& __x, _U2&& __y)
> : first(std::forward<_U1>(__x)), second(std::forward<_U2>(__y)) { }
>
>      template<typename _U1, typename _U2, typename
>        enable_if<_PCCP::template
>      _MoveConstructiblePair<_U1, _U2>()
>     && !_PCCP::template
>      _ImplicitlyMoveConvertiblePair<_U1, _U2>(),
>                         bool>::type=false>
> explicit constexpr pair(_U1&& __x, _U2&& __y)
> : first(std::forward<_U1>(__x)), second(std::forward<_U2>(__y)) { }
>
>
>      template<typename _U1, typename _U2, typename
>        enable_if<_PCCFP<_U1, _U2>::template
>      _MoveConstructiblePair<_U1, _U2>()
>     && _PCCFP<_U1, _U2>::template
>      _ImplicitlyMoveConvertiblePair<_U1, _U2>(),
>                         bool>::type=true>
> constexpr pair(pair<_U1, _U2>&& __p)
> : first(std::forward<_U1>(__p.first)),
>   second(std::forward<_U2>(__p.second)) { }
>
>      template<typename _U1, typename _U2, typename
>        enable_if<_PCCFP<_U1, _U2>::template
>      _MoveConstructiblePair<_U1, _U2>()
>     && !_PCCFP<_U1, _U2>::template
>      _ImplicitlyMoveConvertiblePair<_U1, _U2>(),
>                         bool>::type=false>
> explicit constexpr pair(pair<_U1, _U2>&& __p)
> : first(std::forward<_U1>(__p.first)),
>   second(std::forward<_U2>(__p.second)) { }
>
>      template<typename... _Args1, typename... _Args2>
>        pair(piecewise_construct_t, tuple<_Args1...>, tuple<_Args2...>);
>
>      pair&
>      operator=(typename conditional<
>  __and_<is_copy_assignable<_T1>,
>         is_copy_assignable<_T2>>::value,
>  const pair&, const __nonesuch_no_braces&>::type __p)
>      {
> first = __p.first;
> second = __p.second;
> return *this;
>      }
>
>      pair&
>      operator=(typename conditional<
>  __not_<__and_<is_copy_assignable<_T1>,
>                is_copy_assignable<_T2>>>::value,
>  const pair&, const __nonesuch_no_braces&>::type __p) = delete;
>
>      pair&
>      operator=(typename conditional<
>  __and_<is_move_assignable<_T1>,
>         is_move_assignable<_T2>>::value,
>  pair&&, __nonesuch_no_braces&&>::type __p)
>      noexcept(__and_<is_nothrow_move_assignable<_T1>,
>               is_nothrow_move_assignable<_T2>>::value)
>      {
> first = std::forward<first_type>(__p.first);
> second = std::forward<second_type>(__p.second);
> return *this;
>      }
>
>      template<typename _U1, typename _U2>
>      typename enable_if<__and_<is_assignable<_T1&, const _U1&>,
>    is_assignable<_T2&, const _U2&>>::value,
>    pair&>::type
> operator=(const pair<_U1, _U2>& __p)
> {
>   first = __p.first;
>   second = __p.second;
>   return *this;
> }
>
>      template<typename _U1, typename _U2>
>      typename enable_if<__and_<is_assignable<_T1&, _U1&&>,
>    is_assignable<_T2&, _U2&&>>::value,
>    pair&>::type
> operator=(pair<_U1, _U2>&& __p)
> {
>   first = std::forward<_U1>(__p.first);
>   second = std::forward<_U2>(__p.second);
>   return *this;
> }
>
>      void
>      swap(pair& __p)
>      noexcept(__and_<__is_nothrow_swappable<_T1>,
>                      __is_nothrow_swappable<_T2>>::value)
>      {
> using std::swap;
> swap(first, __p.first);
> swap(second, __p.second);
>      }
>
>    private:
>      template<typename... _Args1, std::size_t... _Indexes1,
>               typename... _Args2, std::size_t... _Indexes2>
>        pair(tuple<_Args1...>&, tuple<_Args2...>&,
>             _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>);
>
>    };
>
>
>
>
>
>
>  template<typename _T1, typename _T2>
>    inline constexpr bool
>    operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
>    { return __x.first == __y.first && __x.second == __y.second; }
>
>
>  template<typename _T1, typename _T2>
>    inline constexpr bool
>    operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
>    { return __x.first < __y.first
>      || (!(__y.first < __x.first) && __x.second < __y.second); }
>
>
>  template<typename _T1, typename _T2>
>    inline constexpr bool
>    operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
>    { return !(__x == __y); }
>
>
>  template<typename _T1, typename _T2>
>    inline constexpr bool
>    operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
>    { return __y < __x; }
>
>
>  template<typename _T1, typename _T2>
>    inline constexpr bool
>    operator<=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
>    { return !(__y < __x); }
>
>
>  template<typename _T1, typename _T2>
>    inline constexpr bool
>    operator>=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
>    { return !(__x < __y); }
>
>
>
>
>
>  template<typename _T1, typename _T2>
>    inline
>
>
>    typename enable_if<__and_<__is_swappable<_T1>,
>                              __is_swappable<_T2>>::value>::type
>
>
>
>    swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
>    noexcept(noexcept(__x.swap(__y)))
>    { __x.swap(__y); }
>
>
>  template<typename _T1, typename _T2>
>    typename enable_if<!__and_<__is_swappable<_T1>,
>          __is_swappable<_T2>>::value>::type
>    swap(pair<_T1, _T2>&, pair<_T1, _T2>&) = delete;
># 516 "/usr/include/c++/8/bits/stl_pair.h" 3
>  template<typename _T1, typename _T2>
>    constexpr pair<typename __decay_and_strip<_T1>::__type,
>                   typename __decay_and_strip<_T2>::__type>
>    make_pair(_T1&& __x, _T2&& __y)
>    {
>      typedef typename __decay_and_strip<_T1>::__type __ds_type1;
>      typedef typename __decay_and_strip<_T2>::__type __ds_type2;
>      typedef pair<__ds_type1, __ds_type2> __pair_type;
>      return __pair_type(std::forward<_T1>(__x), std::forward<_T2>(__y));
>    }
># 535 "/usr/include/c++/8/bits/stl_pair.h" 3
>
>}
># 65 "/usr/include/c++/8/bits/stl_algobase.h" 2 3
># 1 "/usr/include/c++/8/bits/stl_iterator_base_types.h" 1 3
># 62 "/usr/include/c++/8/bits/stl_iterator_base_types.h" 3
>       
># 63 "/usr/include/c++/8/bits/stl_iterator_base_types.h" 3
>
>
>
>
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 89 "/usr/include/c++/8/bits/stl_iterator_base_types.h" 3
>  struct input_iterator_tag { };
>
>
>  struct output_iterator_tag { };
>
>
>  struct forward_iterator_tag : public input_iterator_tag { };
>
>
>
>  struct bidirectional_iterator_tag : public forward_iterator_tag { };
>
>
>
>  struct random_access_iterator_tag : public bidirectional_iterator_tag { };
># 116 "/usr/include/c++/8/bits/stl_iterator_base_types.h" 3
>  template<typename _Category, typename _Tp, typename _Distance = ptrdiff_t,
>           typename _Pointer = _Tp*, typename _Reference = _Tp&>
>    struct iterator
>    {
>
>      typedef _Category iterator_category;
>
>      typedef _Tp value_type;
>
>      typedef _Distance difference_type;
>
>      typedef _Pointer pointer;
>
>      typedef _Reference reference;
>    };
># 143 "/usr/include/c++/8/bits/stl_iterator_base_types.h" 3
>  template<typename _Iterator, typename = __void_t<>>
>    struct __iterator_traits { };
>
>  template<typename _Iterator>
>    struct __iterator_traits<_Iterator,
>        __void_t<typename _Iterator::iterator_category,
>          typename _Iterator::value_type,
>          typename _Iterator::difference_type,
>          typename _Iterator::pointer,
>          typename _Iterator::reference>>
>    {
>      typedef typename _Iterator::iterator_category iterator_category;
>      typedef typename _Iterator::value_type value_type;
>      typedef typename _Iterator::difference_type difference_type;
>      typedef typename _Iterator::pointer pointer;
>      typedef typename _Iterator::reference reference;
>    };
>
>  template<typename _Iterator>
>    struct iterator_traits
>    : public __iterator_traits<_Iterator> { };
># 177 "/usr/include/c++/8/bits/stl_iterator_base_types.h" 3
>  template<typename _Tp>
>    struct iterator_traits<_Tp*>
>    {
>      typedef random_access_iterator_tag iterator_category;
>      typedef _Tp value_type;
>      typedef ptrdiff_t difference_type;
>      typedef _Tp* pointer;
>      typedef _Tp& reference;
>    };
>
>
>  template<typename _Tp>
>    struct iterator_traits<const _Tp*>
>    {
>      typedef random_access_iterator_tag iterator_category;
>      typedef _Tp value_type;
>      typedef ptrdiff_t difference_type;
>      typedef const _Tp* pointer;
>      typedef const _Tp& reference;
>    };
>
>
>
>
>
>  template<typename _Iter>
>    inline constexpr
>    typename iterator_traits<_Iter>::iterator_category
>    __iterator_category(const _Iter&)
>    { return typename iterator_traits<_Iter>::iterator_category(); }
># 231 "/usr/include/c++/8/bits/stl_iterator_base_types.h" 3
>  template<typename _InIter>
>    using _RequireInputIter = typename
>      enable_if<is_convertible<typename
>  iterator_traits<_InIter>::iterator_category,
>          input_iterator_tag>::value>::type;
>
>
>
>}
># 66 "/usr/include/c++/8/bits/stl_algobase.h" 2 3
># 1 "/usr/include/c++/8/bits/stl_iterator_base_funcs.h" 1 3
># 62 "/usr/include/c++/8/bits/stl_iterator_base_funcs.h" 3
>       
># 63 "/usr/include/c++/8/bits/stl_iterator_base_funcs.h" 3
>
>
># 1 "/usr/include/c++/8/debug/assertions.h" 1 3
># 66 "/usr/include/c++/8/bits/stl_iterator_base_funcs.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>  template <typename> struct _List_iterator;
>  template <typename> struct _List_const_iterator;
>
>
>  template<typename _InputIterator>
>    inline constexpr
>    typename iterator_traits<_InputIterator>::difference_type
>    __distance(_InputIterator __first, _InputIterator __last,
>               input_iterator_tag)
>    {
>
>     
>
>      typename iterator_traits<_InputIterator>::difference_type __n = 0;
>      while (__first != __last)
> {
>   ++__first;
>   ++__n;
> }
>      return __n;
>    }
>
>  template<typename _RandomAccessIterator>
>    inline constexpr
>    typename iterator_traits<_RandomAccessIterator>::difference_type
>    __distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
>               random_access_iterator_tag)
>    {
>
>     
>
>      return __last - __first;
>    }
>
>
>
>  template<typename _Tp>
>    ptrdiff_t
>    __distance(std::_List_iterator<_Tp>,
>        std::_List_iterator<_Tp>,
>        input_iterator_tag);
>
>  template<typename _Tp>
>    ptrdiff_t
>    __distance(std::_List_const_iterator<_Tp>,
>        std::_List_const_iterator<_Tp>,
>        input_iterator_tag);
># 135 "/usr/include/c++/8/bits/stl_iterator_base_funcs.h" 3
>  template<typename _InputIterator>
>    inline
>    typename iterator_traits<_InputIterator>::difference_type
>    distance(_InputIterator __first, _InputIterator __last)
>    {
>
>      return std::__distance(__first, __last,
>        std::__iterator_category(__first));
>    }
>
>  template<typename _InputIterator, typename _Distance>
>    inline constexpr void
>    __advance(_InputIterator& __i, _Distance __n, input_iterator_tag)
>    {
>
>     
>      ;
>      while (__n--)
> ++__i;
>    }
>
>  template<typename _BidirectionalIterator, typename _Distance>
>    inline constexpr void
>    __advance(_BidirectionalIterator& __i, _Distance __n,
>       bidirectional_iterator_tag)
>    {
>
>     
>
>      if (__n > 0)
>        while (__n--)
>   ++__i;
>      else
>        while (__n++)
>   --__i;
>    }
>
>  template<typename _RandomAccessIterator, typename _Distance>
>    inline constexpr void
>    __advance(_RandomAccessIterator& __i, _Distance __n,
>              random_access_iterator_tag)
>    {
>
>     
>
>      if (__builtin_constant_p(__n) && __n == 1)
> ++__i;
>      else if (__builtin_constant_p(__n) && __n == -1)
> --__i;
>      else
> __i += __n;
>    }
># 200 "/usr/include/c++/8/bits/stl_iterator_base_funcs.h" 3
>  template<typename _InputIterator, typename _Distance>
>    inline void
>    advance(_InputIterator& __i, _Distance __n)
>    {
>
>      typename iterator_traits<_InputIterator>::difference_type __d = __n;
>      std::__advance(__i, __d, std::__iterator_category(__i));
>    }
>
>
>
>  template<typename _InputIterator>
>    inline _InputIterator
>    next(_InputIterator __x, typename
>  iterator_traits<_InputIterator>::difference_type __n = 1)
>    {
>
>     
>      std::advance(__x, __n);
>      return __x;
>    }
>
>  template<typename _BidirectionalIterator>
>    inline _BidirectionalIterator
>    prev(_BidirectionalIterator __x, typename
>  iterator_traits<_BidirectionalIterator>::difference_type __n = 1)
>    {
>
>     
>
>      std::advance(__x, -__n);
>      return __x;
>    }
>
>
>
>
>}
># 67 "/usr/include/c++/8/bits/stl_algobase.h" 2 3
># 1 "/usr/include/c++/8/bits/stl_iterator.h" 1 3
># 66 "/usr/include/c++/8/bits/stl_iterator.h" 3
># 1 "/usr/include/c++/8/bits/ptr_traits.h" 1 3
># 37 "/usr/include/c++/8/bits/ptr_traits.h" 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  class __undefined;
>
>
>  template<typename _Tp>
>    struct __get_first_arg
>    { using type = __undefined; };
>
>  template<template<typename, typename...> class _Template, typename _Tp,
>           typename... _Types>
>    struct __get_first_arg<_Template<_Tp, _Types...>>
>    { using type = _Tp; };
>
>  template<typename _Tp>
>    using __get_first_arg_t = typename __get_first_arg<_Tp>::type;
>
>
>  template<typename _Tp, typename _Up>
>    struct __replace_first_arg
>    { };
>
>  template<template<typename, typename...> class _Template, typename _Up,
>           typename _Tp, typename... _Types>
>    struct __replace_first_arg<_Template<_Tp, _Types...>, _Up>
>    { using type = _Template<_Up, _Types...>; };
>
>  template<typename _Tp, typename _Up>
>    using __replace_first_arg_t = typename __replace_first_arg<_Tp, _Up>::type;
>
>  template<typename _Tp>
>    using __make_not_void
>      = typename conditional<is_void<_Tp>::value, __undefined, _Tp>::type;
>
>
>
>
>
>  template<typename _Ptr>
>    struct pointer_traits
>    {
>    private:
>      template<typename _Tp>
> using __element_type = typename _Tp::element_type;
>
>      template<typename _Tp>
> using __difference_type = typename _Tp::difference_type;
>
>      template<typename _Tp, typename _Up, typename = void>
> struct __rebind : __replace_first_arg<_Tp, _Up> { };
>
>      template<typename _Tp, typename _Up>
> struct __rebind<_Tp, _Up, __void_t<typename _Tp::template rebind<_Up>>>
> { using type = typename _Tp::template rebind<_Up>; };
>
>    public:
>
>      using pointer = _Ptr;
>
>
>      using element_type
> = __detected_or_t<__get_first_arg_t<_Ptr>, __element_type, _Ptr>;
>
>
>      using difference_type
> = __detected_or_t<ptrdiff_t, __difference_type, _Ptr>;
>
>
>      template<typename _Up>
>        using rebind = typename __rebind<_Ptr, _Up>::type;
>
>      static _Ptr
>      pointer_to(__make_not_void<element_type>& __e)
>      { return _Ptr::pointer_to(__e); }
>
>      static_assert(!is_same<element_type, __undefined>::value,
>   "pointer type defines element_type or is like SomePointer<T, Args>");
>    };
>
>
>
>
>
>  template<typename _Tp>
>    struct pointer_traits<_Tp*>
>    {
>
>      typedef _Tp* pointer;
>
>      typedef _Tp element_type;
>
>      typedef ptrdiff_t difference_type;
>
>      template<typename _Up>
>        using rebind = _Up*;
>
>
>
>
>
>
>      static pointer
>      pointer_to(__make_not_void<element_type>& __r) noexcept
>      { return std::addressof(__r); }
>    };
>
>
>  template<typename _Ptr, typename _Tp>
>    using __ptr_rebind = typename pointer_traits<_Ptr>::template rebind<_Tp>;
>
>  template<typename _Tp>
>    constexpr _Tp*
>    __to_address(_Tp* __ptr) noexcept
>    {
>      static_assert(!std::is_function<_Tp>::value, "not a function pointer");
>      return __ptr;
>    }
>
>
>  template<typename _Ptr>
>    constexpr typename std::pointer_traits<_Ptr>::element_type*
>    __to_address(const _Ptr& __ptr)
>    { return std::__to_address(__ptr.operator->()); }
># 198 "/usr/include/c++/8/bits/ptr_traits.h" 3
>
>}
># 67 "/usr/include/c++/8/bits/stl_iterator.h" 2 3
>
>
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 100 "/usr/include/c++/8/bits/stl_iterator.h" 3
>  template<typename _Iterator>
>    class reverse_iterator
>    : public iterator<typename iterator_traits<_Iterator>::iterator_category,
>        typename iterator_traits<_Iterator>::value_type,
>        typename iterator_traits<_Iterator>::difference_type,
>        typename iterator_traits<_Iterator>::pointer,
>                      typename iterator_traits<_Iterator>::reference>
>    {
>    protected:
>      _Iterator current;
>
>      typedef iterator_traits<_Iterator> __traits_type;
>
>    public:
>      typedef _Iterator iterator_type;
>      typedef typename __traits_type::difference_type difference_type;
>      typedef typename __traits_type::pointer pointer;
>      typedef typename __traits_type::reference reference;
>
>
>
>
>
>
>
>     
>      reverse_iterator() : current() { }
>
>
>
>
>      explicit
>      reverse_iterator(iterator_type __x) : current(__x) { }
>
>
>
>
>     
>      reverse_iterator(const reverse_iterator& __x)
>      : current(__x.current) { }
>
>
>
>
>
>      template<typename _Iter>
>
>        reverse_iterator(const reverse_iterator<_Iter>& __x)
> : current(__x.base()) { }
>
>
>
>
>      iterator_type
>      base() const
>      { return current; }
># 167 "/usr/include/c++/8/bits/stl_iterator.h" 3
>      reference
>      operator*() const
>      {
> _Iterator __tmp = current;
> return *--__tmp;
>      }
>
>
>
>
>
>
>      pointer
>      operator->() const
>      { return &(operator*()); }
>
>
>
>
>
>
>      reverse_iterator&
>      operator++()
>      {
> --current;
> return *this;
>      }
>
>
>
>
>
>
>      reverse_iterator
>      operator++(int)
>      {
> reverse_iterator __tmp = *this;
> --current;
> return __tmp;
>      }
>
>
>
>
>
>
>      reverse_iterator&
>      operator--()
>      {
> ++current;
> return *this;
>      }
>
>
>
>
>
>
>      reverse_iterator
>      operator--(int)
>      {
> reverse_iterator __tmp = *this;
> ++current;
> return __tmp;
>      }
>
>
>
>
>
>
>      reverse_iterator
>      operator+(difference_type __n) const
>      { return reverse_iterator(current - __n); }
>
>
>
>
>
>
>
>      reverse_iterator&
>      operator+=(difference_type __n)
>      {
> current -= __n;
> return *this;
>      }
>
>
>
>
>
>
>      reverse_iterator
>      operator-(difference_type __n) const
>      { return reverse_iterator(current + __n); }
>
>
>
>
>
>
>
>      reverse_iterator&
>      operator-=(difference_type __n)
>      {
> current += __n;
> return *this;
>      }
>
>
>
>
>
>
>      reference
>      operator[](difference_type __n) const
>      { return *(*this + __n); }
>    };
># 297 "/usr/include/c++/8/bits/stl_iterator.h" 3
>  template<typename _Iterator>
>    inline bool
>    operator==(const reverse_iterator<_Iterator>& __x,
>        const reverse_iterator<_Iterator>& __y)
>    { return __x.base() == __y.base(); }
>
>  template<typename _Iterator>
>    inline bool
>    operator<(const reverse_iterator<_Iterator>& __x,
>       const reverse_iterator<_Iterator>& __y)
>    { return __y.base() < __x.base(); }
>
>  template<typename _Iterator>
>    inline bool
>    operator!=(const reverse_iterator<_Iterator>& __x,
>        const reverse_iterator<_Iterator>& __y)
>    { return !(__x == __y); }
>
>  template<typename _Iterator>
>    inline bool
>    operator>(const reverse_iterator<_Iterator>& __x,
>       const reverse_iterator<_Iterator>& __y)
>    { return __y < __x; }
>
>  template<typename _Iterator>
>    inline bool
>    operator<=(const reverse_iterator<_Iterator>& __x,
>        const reverse_iterator<_Iterator>& __y)
>    { return !(__y < __x); }
>
>  template<typename _Iterator>
>    inline bool
>    operator>=(const reverse_iterator<_Iterator>& __x,
>        const reverse_iterator<_Iterator>& __y)
>    { return !(__x < __y); }
>
>
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline bool
>    operator==(const reverse_iterator<_IteratorL>& __x,
>        const reverse_iterator<_IteratorR>& __y)
>    { return __x.base() == __y.base(); }
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline bool
>    operator<(const reverse_iterator<_IteratorL>& __x,
>       const reverse_iterator<_IteratorR>& __y)
>    { return __y.base() < __x.base(); }
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline bool
>    operator!=(const reverse_iterator<_IteratorL>& __x,
>        const reverse_iterator<_IteratorR>& __y)
>    { return !(__x == __y); }
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline bool
>    operator>(const reverse_iterator<_IteratorL>& __x,
>       const reverse_iterator<_IteratorR>& __y)
>    { return __y < __x; }
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline bool
>    operator<=(const reverse_iterator<_IteratorL>& __x,
>        const reverse_iterator<_IteratorR>& __y)
>    { return !(__y < __x); }
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline bool
>    operator>=(const reverse_iterator<_IteratorL>& __x,
>        const reverse_iterator<_IteratorR>& __y)
>    { return !(__x < __y); }
># 387 "/usr/include/c++/8/bits/stl_iterator.h" 3
>  template<typename _IteratorL, typename _IteratorR>
>    inline auto
>    operator-(const reverse_iterator<_IteratorL>& __x,
>       const reverse_iterator<_IteratorR>& __y)
>    -> decltype(__y.base() - __x.base())
>    { return __y.base() - __x.base(); }
>
>
>  template<typename _Iterator>
>    inline reverse_iterator<_Iterator>
>    operator+(typename reverse_iterator<_Iterator>::difference_type __n,
>       const reverse_iterator<_Iterator>& __x)
>    { return reverse_iterator<_Iterator>(__x.base() - __n); }
>
>
>
>  template<typename _Iterator>
>    inline reverse_iterator<_Iterator>
>    __make_reverse_iterator(_Iterator __i)
>    { return reverse_iterator<_Iterator>(__i); }
>
>
>
>
>
>
>
>  template<typename _Iterator>
>    inline reverse_iterator<_Iterator>
>    make_reverse_iterator(_Iterator __i)
>    { return reverse_iterator<_Iterator>(__i); }
>
>
>
>
>  template<typename _Iterator>
>    auto
>    __niter_base(reverse_iterator<_Iterator> __it)
>    -> decltype(__make_reverse_iterator(__niter_base(__it.base())))
>    { return __make_reverse_iterator(__niter_base(__it.base())); }
>
>  template<typename _Iterator>
>    struct __is_move_iterator<reverse_iterator<_Iterator> >
>      : __is_move_iterator<_Iterator>
>    { };
>
>  template<typename _Iterator>
>    auto
>    __miter_base(reverse_iterator<_Iterator> __it)
>    -> decltype(__make_reverse_iterator(__miter_base(__it.base())))
>    { return __make_reverse_iterator(__miter_base(__it.base())); }
># 451 "/usr/include/c++/8/bits/stl_iterator.h" 3
>  template<typename _Container>
>    class back_insert_iterator
>    : public iterator<output_iterator_tag, void, void, void, void>
>    {
>    protected:
>      _Container* container;
>
>    public:
>
>      typedef _Container container_type;
>
>
>      explicit
>      back_insert_iterator(_Container& __x)
>      : container(std::__addressof(__x)) { }
># 486 "/usr/include/c++/8/bits/stl_iterator.h" 3
>      back_insert_iterator&
>      operator=(const typename _Container::value_type& __value)
>      {
> container->push_back(__value);
> return *this;
>      }
>
>      back_insert_iterator&
>      operator=(typename _Container::value_type&& __value)
>      {
> container->push_back(std::move(__value));
> return *this;
>      }
>
>
>
>      back_insert_iterator&
>      operator*()
>      { return *this; }
>
>
>      back_insert_iterator&
>      operator++()
>      { return *this; }
>
>
>      back_insert_iterator
>      operator++(int)
>      { return *this; }
>    };
># 528 "/usr/include/c++/8/bits/stl_iterator.h" 3
>  template<typename _Container>
>    inline back_insert_iterator<_Container>
>    back_inserter(_Container& __x)
>    { return back_insert_iterator<_Container>(__x); }
># 543 "/usr/include/c++/8/bits/stl_iterator.h" 3
>  template<typename _Container>
>    class front_insert_iterator
>    : public iterator<output_iterator_tag, void, void, void, void>
>    {
>    protected:
>      _Container* container;
>
>    public:
>
>      typedef _Container container_type;
>
>
>      explicit front_insert_iterator(_Container& __x)
>      : container(std::__addressof(__x)) { }
># 577 "/usr/include/c++/8/bits/stl_iterator.h" 3
>      front_insert_iterator&
>      operator=(const typename _Container::value_type& __value)
>      {
> container->push_front(__value);
> return *this;
>      }
>
>      front_insert_iterator&
>      operator=(typename _Container::value_type&& __value)
>      {
> container->push_front(std::move(__value));
> return *this;
>      }
>
>
>
>      front_insert_iterator&
>      operator*()
>      { return *this; }
>
>
>      front_insert_iterator&
>      operator++()
>      { return *this; }
>
>
>      front_insert_iterator
>      operator++(int)
>      { return *this; }
>    };
># 619 "/usr/include/c++/8/bits/stl_iterator.h" 3
>  template<typename _Container>
>    inline front_insert_iterator<_Container>
>    front_inserter(_Container& __x)
>    { return front_insert_iterator<_Container>(__x); }
># 638 "/usr/include/c++/8/bits/stl_iterator.h" 3
>  template<typename _Container>
>    class insert_iterator
>    : public iterator<output_iterator_tag, void, void, void, void>
>    {
>    protected:
>      _Container* container;
>      typename _Container::iterator iter;
>
>    public:
>
>      typedef _Container container_type;
>
>
>
>
>
>      insert_iterator(_Container& __x, typename _Container::iterator __i)
>      : container(std::__addressof(__x)), iter(__i) {}
># 689 "/usr/include/c++/8/bits/stl_iterator.h" 3
>      insert_iterator&
>      operator=(const typename _Container::value_type& __value)
>      {
> iter = container->insert(iter, __value);
> ++iter;
> return *this;
>      }
>
>      insert_iterator&
>      operator=(typename _Container::value_type&& __value)
>      {
> iter = container->insert(iter, std::move(__value));
> ++iter;
> return *this;
>      }
>
>
>
>      insert_iterator&
>      operator*()
>      { return *this; }
>
>
>      insert_iterator&
>      operator++()
>      { return *this; }
>
>
>      insert_iterator&
>      operator++(int)
>      { return *this; }
>    };
># 734 "/usr/include/c++/8/bits/stl_iterator.h" 3
>  template<typename _Container, typename _Iterator>
>    inline insert_iterator<_Container>
>    inserter(_Container& __x, _Iterator __i)
>    {
>      return insert_iterator<_Container>(__x,
>      typename _Container::iterator(__i));
>    }
>
>
>
>
>}
>
>namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
>{
>
># 758 "/usr/include/c++/8/bits/stl_iterator.h" 3
>  using std::iterator_traits;
>  using std::iterator;
>  template<typename _Iterator, typename _Container>
>    class __normal_iterator
>    {
>    protected:
>      _Iterator _M_current;
>
>      typedef iterator_traits<_Iterator> __traits_type;
>
>    public:
>      typedef _Iterator iterator_type;
>      typedef typename __traits_type::iterator_category iterator_category;
>      typedef typename __traits_type::value_type value_type;
>      typedef typename __traits_type::difference_type difference_type;
>      typedef typename __traits_type::reference reference;
>      typedef typename __traits_type::pointer pointer;
>
>      constexpr __normal_iterator() noexcept
>      : _M_current(_Iterator()) { }
>
>      explicit
>      __normal_iterator(const _Iterator& __i) noexcept
>      : _M_current(__i) { }
>
>
>      template<typename _Iter>
>        __normal_iterator(const __normal_iterator<_Iter,
>     typename __enable_if<
>              (std::__are_same<_Iter, typename _Container::pointer>::__value),
>        _Container>::__type>& __i) noexcept
>        : _M_current(__i.base()) { }
>
>
>      reference
>      operator*() const noexcept
>      { return *_M_current; }
>
>      pointer
>      operator->() const noexcept
>      { return _M_current; }
>
>      __normal_iterator&
>      operator++() noexcept
>      {
> ++_M_current;
> return *this;
>      }
>
>      __normal_iterator
>      operator++(int) noexcept
>      { return __normal_iterator(_M_current++); }
>
>
>      __normal_iterator&
>      operator--() noexcept
>      {
> --_M_current;
> return *this;
>      }
>
>      __normal_iterator
>      operator--(int) noexcept
>      { return __normal_iterator(_M_current--); }
>
>
>      reference
>      operator[](difference_type __n) const noexcept
>      { return _M_current[__n]; }
>
>      __normal_iterator&
>      operator+=(difference_type __n) noexcept
>      { _M_current += __n; return *this; }
>
>      __normal_iterator
>      operator+(difference_type __n) const noexcept
>      { return __normal_iterator(_M_current + __n); }
>
>      __normal_iterator&
>      operator-=(difference_type __n) noexcept
>      { _M_current -= __n; return *this; }
>
>      __normal_iterator
>      operator-(difference_type __n) const noexcept
>      { return __normal_iterator(_M_current - __n); }
>
>      const _Iterator&
>      base() const noexcept
>      { return _M_current; }
>    };
># 858 "/usr/include/c++/8/bits/stl_iterator.h" 3
>  template<typename _IteratorL, typename _IteratorR, typename _Container>
>    inline bool
>    operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
>        const __normal_iterator<_IteratorR, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() == __rhs.base(); }
>
>  template<typename _Iterator, typename _Container>
>    inline bool
>    operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
>        const __normal_iterator<_Iterator, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() == __rhs.base(); }
>
>  template<typename _IteratorL, typename _IteratorR, typename _Container>
>    inline bool
>    operator!=(const __normal_iterator<_IteratorL, _Container>& __lhs,
>        const __normal_iterator<_IteratorR, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() != __rhs.base(); }
>
>  template<typename _Iterator, typename _Container>
>    inline bool
>    operator!=(const __normal_iterator<_Iterator, _Container>& __lhs,
>        const __normal_iterator<_Iterator, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() != __rhs.base(); }
>
>
>  template<typename _IteratorL, typename _IteratorR, typename _Container>
>    inline bool
>    operator<(const __normal_iterator<_IteratorL, _Container>& __lhs,
>       const __normal_iterator<_IteratorR, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() < __rhs.base(); }
>
>  template<typename _Iterator, typename _Container>
>    inline bool
>    operator<(const __normal_iterator<_Iterator, _Container>& __lhs,
>       const __normal_iterator<_Iterator, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() < __rhs.base(); }
>
>  template<typename _IteratorL, typename _IteratorR, typename _Container>
>    inline bool
>    operator>(const __normal_iterator<_IteratorL, _Container>& __lhs,
>       const __normal_iterator<_IteratorR, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() > __rhs.base(); }
>
>  template<typename _Iterator, typename _Container>
>    inline bool
>    operator>(const __normal_iterator<_Iterator, _Container>& __lhs,
>       const __normal_iterator<_Iterator, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() > __rhs.base(); }
>
>  template<typename _IteratorL, typename _IteratorR, typename _Container>
>    inline bool
>    operator<=(const __normal_iterator<_IteratorL, _Container>& __lhs,
>        const __normal_iterator<_IteratorR, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() <= __rhs.base(); }
>
>  template<typename _Iterator, typename _Container>
>    inline bool
>    operator<=(const __normal_iterator<_Iterator, _Container>& __lhs,
>        const __normal_iterator<_Iterator, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() <= __rhs.base(); }
>
>  template<typename _IteratorL, typename _IteratorR, typename _Container>
>    inline bool
>    operator>=(const __normal_iterator<_IteratorL, _Container>& __lhs,
>        const __normal_iterator<_IteratorR, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() >= __rhs.base(); }
>
>  template<typename _Iterator, typename _Container>
>    inline bool
>    operator>=(const __normal_iterator<_Iterator, _Container>& __lhs,
>        const __normal_iterator<_Iterator, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() >= __rhs.base(); }
>
>
>
>
>
>  template<typename _IteratorL, typename _IteratorR, typename _Container>
>
>
>    inline auto
>    operator-(const __normal_iterator<_IteratorL, _Container>& __lhs,
>       const __normal_iterator<_IteratorR, _Container>& __rhs) noexcept
>    -> decltype(__lhs.base() - __rhs.base())
>
>
>
>
>
>    { return __lhs.base() - __rhs.base(); }
>
>  template<typename _Iterator, typename _Container>
>    inline typename __normal_iterator<_Iterator, _Container>::difference_type
>    operator-(const __normal_iterator<_Iterator, _Container>& __lhs,
>       const __normal_iterator<_Iterator, _Container>& __rhs)
>    noexcept
>    { return __lhs.base() - __rhs.base(); }
>
>  template<typename _Iterator, typename _Container>
>    inline __normal_iterator<_Iterator, _Container>
>    operator+(typename __normal_iterator<_Iterator, _Container>::difference_type
>       __n, const __normal_iterator<_Iterator, _Container>& __i)
>    noexcept
>    { return __normal_iterator<_Iterator, _Container>(__i.base() + __n); }
>
>
>}
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  template<typename _Iterator, typename _Container>
>    _Iterator
>    __niter_base(__gnu_cxx::__normal_iterator<_Iterator, _Container> __it)
>    { return __it.base(); }
># 1003 "/usr/include/c++/8/bits/stl_iterator.h" 3
>  template<typename _Iterator>
>    class move_iterator
>    {
>    protected:
>      _Iterator _M_current;
>
>      typedef iterator_traits<_Iterator> __traits_type;
>      typedef typename __traits_type::reference __base_ref;
>
>    public:
>      typedef _Iterator iterator_type;
>      typedef typename __traits_type::iterator_category iterator_category;
>      typedef typename __traits_type::value_type value_type;
>      typedef typename __traits_type::difference_type difference_type;
>
>      typedef _Iterator pointer;
>
>
>      typedef typename conditional<is_reference<__base_ref>::value,
>    typename remove_reference<__base_ref>::type&&,
>    __base_ref>::type reference;
>
>     
>      move_iterator()
>      : _M_current() { }
>
>      explicit
>      move_iterator(iterator_type __i)
>      : _M_current(__i) { }
>
>      template<typename _Iter>
>
> move_iterator(const move_iterator<_Iter>& __i)
> : _M_current(__i.base()) { }
>
>      iterator_type
>      base() const
>      { return _M_current; }
>
>      reference
>      operator*() const
>      { return static_cast<reference>(*_M_current); }
>
>      pointer
>      operator->() const
>      { return _M_current; }
>
>      move_iterator&
>      operator++()
>      {
> ++_M_current;
> return *this;
>      }
>
>      move_iterator
>      operator++(int)
>      {
> move_iterator __tmp = *this;
> ++_M_current;
> return __tmp;
>      }
>
>      move_iterator&
>      operator--()
>      {
> --_M_current;
> return *this;
>      }
>
>      move_iterator
>      operator--(int)
>      {
> move_iterator __tmp = *this;
> --_M_current;
> return __tmp;
>      }
>
>      move_iterator
>      operator+(difference_type __n) const
>      { return move_iterator(_M_current + __n); }
>
>      move_iterator&
>      operator+=(difference_type __n)
>      {
> _M_current += __n;
> return *this;
>      }
>
>      move_iterator
>      operator-(difference_type __n) const
>      { return move_iterator(_M_current - __n); }
>
>      move_iterator&
>      operator-=(difference_type __n)
>      {
> _M_current -= __n;
> return *this;
>      }
>
>      reference
>      operator[](difference_type __n) const
>      { return std::move(_M_current[__n]); }
>    };
>
>
>
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline bool
>    operator==(const move_iterator<_IteratorL>& __x,
>        const move_iterator<_IteratorR>& __y)
>    { return __x.base() == __y.base(); }
>
>  template<typename _Iterator>
>    inline bool
>    operator==(const move_iterator<_Iterator>& __x,
>        const move_iterator<_Iterator>& __y)
>    { return __x.base() == __y.base(); }
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline bool
>    operator!=(const move_iterator<_IteratorL>& __x,
>        const move_iterator<_IteratorR>& __y)
>    { return !(__x == __y); }
>
>  template<typename _Iterator>
>    inline bool
>    operator!=(const move_iterator<_Iterator>& __x,
>        const move_iterator<_Iterator>& __y)
>    { return !(__x == __y); }
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline bool
>    operator<(const move_iterator<_IteratorL>& __x,
>       const move_iterator<_IteratorR>& __y)
>    { return __x.base() < __y.base(); }
>
>  template<typename _Iterator>
>    inline bool
>    operator<(const move_iterator<_Iterator>& __x,
>       const move_iterator<_Iterator>& __y)
>    { return __x.base() < __y.base(); }
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline bool
>    operator<=(const move_iterator<_IteratorL>& __x,
>        const move_iterator<_IteratorR>& __y)
>    { return !(__y < __x); }
>
>  template<typename _Iterator>
>    inline bool
>    operator<=(const move_iterator<_Iterator>& __x,
>        const move_iterator<_Iterator>& __y)
>    { return !(__y < __x); }
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline bool
>    operator>(const move_iterator<_IteratorL>& __x,
>       const move_iterator<_IteratorR>& __y)
>    { return __y < __x; }
>
>  template<typename _Iterator>
>    inline bool
>    operator>(const move_iterator<_Iterator>& __x,
>       const move_iterator<_Iterator>& __y)
>    { return __y < __x; }
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline bool
>    operator>=(const move_iterator<_IteratorL>& __x,
>        const move_iterator<_IteratorR>& __y)
>    { return !(__x < __y); }
>
>  template<typename _Iterator>
>    inline bool
>    operator>=(const move_iterator<_Iterator>& __x,
>        const move_iterator<_Iterator>& __y)
>    { return !(__x < __y); }
>
>
>  template<typename _IteratorL, typename _IteratorR>
>    inline auto
>    operator-(const move_iterator<_IteratorL>& __x,
>       const move_iterator<_IteratorR>& __y)
>    -> decltype(__x.base() - __y.base())
>    { return __x.base() - __y.base(); }
>
>  template<typename _Iterator>
>    inline move_iterator<_Iterator>
>    operator+(typename move_iterator<_Iterator>::difference_type __n,
>       const move_iterator<_Iterator>& __x)
>    { return __x + __n; }
>
>  template<typename _Iterator>
>    inline move_iterator<_Iterator>
>    make_move_iterator(_Iterator __i)
>    { return move_iterator<_Iterator>(__i); }
>
>  template<typename _Iterator, typename _ReturnType
>    = typename conditional<__move_if_noexcept_cond
>      <typename iterator_traits<_Iterator>::value_type>::value,
>                _Iterator, move_iterator<_Iterator>>::type>
>    inline _ReturnType
>    __make_move_if_noexcept_iterator(_Iterator __i)
>    { return _ReturnType(__i); }
>
>
>
>  template<typename _Tp, typename _ReturnType
>    = typename conditional<__move_if_noexcept_cond<_Tp>::value,
>      const _Tp*, move_iterator<_Tp*>>::type>
>    inline _ReturnType
>    __make_move_if_noexcept_iterator(_Tp* __i)
>    { return _ReturnType(__i); }
>
>
>
>  template<typename _Iterator>
>    auto
>    __niter_base(move_iterator<_Iterator> __it)
>    -> decltype(make_move_iterator(__niter_base(__it.base())))
>    { return make_move_iterator(__niter_base(__it.base())); }
>
>  template<typename _Iterator>
>    struct __is_move_iterator<move_iterator<_Iterator> >
>    {
>      enum { __value = 1 };
>      typedef __true_type __type;
>    };
>
>  template<typename _Iterator>
>    auto
>    __miter_base(move_iterator<_Iterator> __it)
>    -> decltype(__miter_base(__it.base()))
>    { return __miter_base(__it.base()); }
># 1268 "/usr/include/c++/8/bits/stl_iterator.h" 3
>
>}
># 68 "/usr/include/c++/8/bits/stl_algobase.h" 2 3
>
># 1 "/usr/include/c++/8/debug/debug.h" 1 3
># 48 "/usr/include/c++/8/debug/debug.h" 3
>namespace std
>{
>  namespace __debug { }
>}
>
>
>
>
>namespace __gnu_debug
>{
>  using namespace std::__debug;
>}
># 70 "/usr/include/c++/8/bits/stl_algobase.h" 2 3
>
># 1 "/usr/include/c++/8/bits/predefined_ops.h" 1 3
># 33 "/usr/include/c++/8/bits/predefined_ops.h" 3
>namespace __gnu_cxx
>{
>namespace __ops
>{
>  struct _Iter_less_iter
>  {
>    template<typename _Iterator1, typename _Iterator2>
>      constexpr
>      bool
>      operator()(_Iterator1 __it1, _Iterator2 __it2) const
>      { return *__it1 < *__it2; }
>  };
>
>  constexpr
>  inline _Iter_less_iter
>  __iter_less_iter()
>  { return _Iter_less_iter(); }
>
>  struct _Iter_less_val
>  {
>
>    constexpr _Iter_less_val() = default;
>
>
>
>
>    explicit
>    _Iter_less_val(_Iter_less_iter) { }
>
>    template<typename _Iterator, typename _Value>
>      bool
>      operator()(_Iterator __it, _Value& __val) const
>      { return *__it < __val; }
>  };
>
>  inline _Iter_less_val
>  __iter_less_val()
>  { return _Iter_less_val(); }
>
>  inline _Iter_less_val
>  __iter_comp_val(_Iter_less_iter)
>  { return _Iter_less_val(); }
>
>  struct _Val_less_iter
>  {
>
>    constexpr _Val_less_iter() = default;
>
>
>
>
>    explicit
>    _Val_less_iter(_Iter_less_iter) { }
>
>    template<typename _Value, typename _Iterator>
>      bool
>      operator()(_Value& __val, _Iterator __it) const
>      { return __val < *__it; }
>  };
>
>  inline _Val_less_iter
>  __val_less_iter()
>  { return _Val_less_iter(); }
>
>  inline _Val_less_iter
>  __val_comp_iter(_Iter_less_iter)
>  { return _Val_less_iter(); }
>
>  struct _Iter_equal_to_iter
>  {
>    template<typename _Iterator1, typename _Iterator2>
>      bool
>      operator()(_Iterator1 __it1, _Iterator2 __it2) const
>      { return *__it1 == *__it2; }
>  };
>
>  inline _Iter_equal_to_iter
>  __iter_equal_to_iter()
>  { return _Iter_equal_to_iter(); }
>
>  struct _Iter_equal_to_val
>  {
>    template<typename _Iterator, typename _Value>
>      bool
>      operator()(_Iterator __it, _Value& __val) const
>      { return *__it == __val; }
>  };
>
>  inline _Iter_equal_to_val
>  __iter_equal_to_val()
>  { return _Iter_equal_to_val(); }
>
>  inline _Iter_equal_to_val
>  __iter_comp_val(_Iter_equal_to_iter)
>  { return _Iter_equal_to_val(); }
>
>  template<typename _Compare>
>    struct _Iter_comp_iter
>    {
>      _Compare _M_comp;
>
>      explicit constexpr
>      _Iter_comp_iter(_Compare __comp)
> : _M_comp(std::move(__comp))
>      { }
>
>      template<typename _Iterator1, typename _Iterator2>
>        constexpr
>        bool
>        operator()(_Iterator1 __it1, _Iterator2 __it2)
>        { return bool(_M_comp(*__it1, *__it2)); }
>    };
>
>  template<typename _Compare>
>    constexpr
>    inline _Iter_comp_iter<_Compare>
>    __iter_comp_iter(_Compare __comp)
>    { return _Iter_comp_iter<_Compare>(std::move(__comp)); }
>
>  template<typename _Compare>
>    struct _Iter_comp_val
>    {
>      _Compare _M_comp;
>
>      explicit
>      _Iter_comp_val(_Compare __comp)
> : _M_comp(std::move(__comp))
>      { }
>
>      explicit
>      _Iter_comp_val(const _Iter_comp_iter<_Compare>& __comp)
> : _M_comp(__comp._M_comp)
>      { }
>
>
>      explicit
>      _Iter_comp_val(_Iter_comp_iter<_Compare>&& __comp)
> : _M_comp(std::move(__comp._M_comp))
>      { }
>
>
>      template<typename _Iterator, typename _Value>
> bool
> operator()(_Iterator __it, _Value& __val)
> { return bool(_M_comp(*__it, __val)); }
>    };
>
>  template<typename _Compare>
>   inline _Iter_comp_val<_Compare>
>    __iter_comp_val(_Compare __comp)
>    { return _Iter_comp_val<_Compare>(std::move(__comp)); }
>
>  template<typename _Compare>
>    inline _Iter_comp_val<_Compare>
>    __iter_comp_val(_Iter_comp_iter<_Compare> __comp)
>    { return _Iter_comp_val<_Compare>(std::move(__comp)); }
>
>  template<typename _Compare>
>    struct _Val_comp_iter
>    {
>      _Compare _M_comp;
>
>      explicit
>      _Val_comp_iter(_Compare __comp)
> : _M_comp(std::move(__comp))
>      { }
>
>      explicit
>      _Val_comp_iter(const _Iter_comp_iter<_Compare>& __comp)
> : _M_comp(__comp._M_comp)
>      { }
>
>
>      explicit
>      _Val_comp_iter(_Iter_comp_iter<_Compare>&& __comp)
> : _M_comp(std::move(__comp._M_comp))
>      { }
>
>
>      template<typename _Value, typename _Iterator>
> bool
> operator()(_Value& __val, _Iterator __it)
> { return bool(_M_comp(__val, *__it)); }
>    };
>
>  template<typename _Compare>
>    inline _Val_comp_iter<_Compare>
>    __val_comp_iter(_Compare __comp)
>    { return _Val_comp_iter<_Compare>(std::move(__comp)); }
>
>  template<typename _Compare>
>    inline _Val_comp_iter<_Compare>
>    __val_comp_iter(_Iter_comp_iter<_Compare> __comp)
>    { return _Val_comp_iter<_Compare>(std::move(__comp)); }
>
>  template<typename _Value>
>    struct _Iter_equals_val
>    {
>      _Value& _M_value;
>
>      explicit
>      _Iter_equals_val(_Value& __value)
> : _M_value(__value)
>      { }
>
>      template<typename _Iterator>
> bool
> operator()(_Iterator __it)
> { return *__it == _M_value; }
>    };
>
>  template<typename _Value>
>    inline _Iter_equals_val<_Value>
>    __iter_equals_val(_Value& __val)
>    { return _Iter_equals_val<_Value>(__val); }
>
>  template<typename _Iterator1>
>    struct _Iter_equals_iter
>    {
>      _Iterator1 _M_it1;
>
>      explicit
>      _Iter_equals_iter(_Iterator1 __it1)
> : _M_it1(__it1)
>      { }
>
>      template<typename _Iterator2>
> bool
> operator()(_Iterator2 __it2)
> { return *__it2 == *_M_it1; }
>    };
>
>  template<typename _Iterator>
>    inline _Iter_equals_iter<_Iterator>
>    __iter_comp_iter(_Iter_equal_to_iter, _Iterator __it)
>    { return _Iter_equals_iter<_Iterator>(__it); }
>
>  template<typename _Predicate>
>    struct _Iter_pred
>    {
>      _Predicate _M_pred;
>
>      explicit
>      _Iter_pred(_Predicate __pred)
> : _M_pred(std::move(__pred))
>      { }
>
>      template<typename _Iterator>
> bool
> operator()(_Iterator __it)
> { return bool(_M_pred(*__it)); }
>    };
>
>  template<typename _Predicate>
>    inline _Iter_pred<_Predicate>
>    __pred_iter(_Predicate __pred)
>    { return _Iter_pred<_Predicate>(std::move(__pred)); }
>
>  template<typename _Compare, typename _Value>
>    struct _Iter_comp_to_val
>    {
>      _Compare _M_comp;
>      _Value& _M_value;
>
>      _Iter_comp_to_val(_Compare __comp, _Value& __value)
> : _M_comp(std::move(__comp)), _M_value(__value)
>      { }
>
>      template<typename _Iterator>
> bool
> operator()(_Iterator __it)
> { return bool(_M_comp(*__it, _M_value)); }
>    };
>
>  template<typename _Compare, typename _Value>
>    _Iter_comp_to_val<_Compare, _Value>
>    __iter_comp_val(_Compare __comp, _Value &__val)
>    {
>      return _Iter_comp_to_val<_Compare, _Value>(std::move(__comp), __val);
>    }
>
>  template<typename _Compare, typename _Iterator1>
>    struct _Iter_comp_to_iter
>    {
>      _Compare _M_comp;
>      _Iterator1 _M_it1;
>
>      _Iter_comp_to_iter(_Compare __comp, _Iterator1 __it1)
> : _M_comp(std::move(__comp)), _M_it1(__it1)
>      { }
>
>      template<typename _Iterator2>
> bool
> operator()(_Iterator2 __it2)
> { return bool(_M_comp(*__it2, *_M_it1)); }
>    };
>
>  template<typename _Compare, typename _Iterator>
>    inline _Iter_comp_to_iter<_Compare, _Iterator>
>    __iter_comp_iter(_Iter_comp_iter<_Compare> __comp, _Iterator __it)
>    {
>      return _Iter_comp_to_iter<_Compare, _Iterator>(
>   std::move(__comp._M_comp), __it);
>    }
>
>  template<typename _Predicate>
>    struct _Iter_negate
>    {
>      _Predicate _M_pred;
>
>      explicit
>      _Iter_negate(_Predicate __pred)
> : _M_pred(std::move(__pred))
>      { }
>
>      template<typename _Iterator>
> bool
> operator()(_Iterator __it)
> { return !bool(_M_pred(*__it)); }
>    };
>
>  template<typename _Predicate>
>    inline _Iter_negate<_Predicate>
>    __negate(_Iter_pred<_Predicate> __pred)
>    { return _Iter_negate<_Predicate>(std::move(__pred._M_pred)); }
>
>}
>}
># 72 "/usr/include/c++/8/bits/stl_algobase.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 118 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _ForwardIterator1, typename _ForwardIterator2>
>    inline void
>    iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
>    {
>
>     
>
>     
># 148 "/usr/include/c++/8/bits/stl_algobase.h" 3
>      swap(*__a, *__b);
>
>    }
># 164 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _ForwardIterator1, typename _ForwardIterator2>
>    _ForwardIterator2
>    swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
>  _ForwardIterator2 __first2)
>    {
>
>     
>
>     
>
>      ;
>
>      for (; __first1 != __last1; ++__first1, (void)++__first2)
> std::iter_swap(__first1, __first2);
>      return __first2;
>    }
># 192 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _Tp>
>    constexpr
>    inline const _Tp&
>    min(const _Tp& __a, const _Tp& __b)
>    {
>
>     
>
>      if (__b < __a)
> return __b;
>      return __a;
>    }
># 216 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _Tp>
>    constexpr
>    inline const _Tp&
>    max(const _Tp& __a, const _Tp& __b)
>    {
>
>     
>
>      if (__a < __b)
> return __b;
>      return __a;
>    }
># 240 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _Tp, typename _Compare>
>    constexpr
>    inline const _Tp&
>    min(const _Tp& __a, const _Tp& __b, _Compare __comp)
>    {
>
>      if (__comp(__b, __a))
> return __b;
>      return __a;
>    }
># 262 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _Tp, typename _Compare>
>    constexpr
>    inline const _Tp&
>    max(const _Tp& __a, const _Tp& __b, _Compare __comp)
>    {
>
>      if (__comp(__a, __b))
> return __b;
>      return __a;
>    }
>
>
>
>  template<typename _Iterator>
>    inline _Iterator
>    __niter_base(_Iterator __it)
>    { return __it; }
>
>
>
>
>
>
>
>  template<bool, bool, typename>
>    struct __copy_move
>    {
>      template<typename _II, typename _OI>
> static _OI
> __copy_m(_II __first, _II __last, _OI __result)
> {
>   for (; __first != __last; ++__result, (void)++__first)
>     *__result = *__first;
>   return __result;
> }
>    };
>
>
>  template<typename _Category>
>    struct __copy_move<true, false, _Category>
>    {
>      template<typename _II, typename _OI>
> static _OI
> __copy_m(_II __first, _II __last, _OI __result)
> {
>   for (; __first != __last; ++__result, (void)++__first)
>     *__result = std::move(*__first);
>   return __result;
> }
>    };
>
>
>  template<>
>    struct __copy_move<false, false, random_access_iterator_tag>
>    {
>      template<typename _II, typename _OI>
> static _OI
> __copy_m(_II __first, _II __last, _OI __result)
> {
>   typedef typename iterator_traits<_II>::difference_type _Distance;
>   for(_Distance __n = __last - __first; __n > 0; --__n)
>     {
>       *__result = *__first;
>       ++__first;
>       ++__result;
>     }
>   return __result;
> }
>    };
>
>
>  template<>
>    struct __copy_move<true, false, random_access_iterator_tag>
>    {
>      template<typename _II, typename _OI>
> static _OI
> __copy_m(_II __first, _II __last, _OI __result)
> {
>   typedef typename iterator_traits<_II>::difference_type _Distance;
>   for(_Distance __n = __last - __first; __n > 0; --__n)
>     {
>       *__result = std::move(*__first);
>       ++__first;
>       ++__result;
>     }
>   return __result;
> }
>    };
>
>
>  template<bool _IsMove>
>    struct __copy_move<_IsMove, true, random_access_iterator_tag>
>    {
>      template<typename _Tp>
> static _Tp*
> __copy_m(const _Tp* __first, const _Tp* __last, _Tp* __result)
> {
>
>   using __assignable = conditional<_IsMove,
>        is_move_assignable<_Tp>,
>        is_copy_assignable<_Tp>>;
>
>   static_assert( __assignable::type::value, "type is not assignable" );
>
>   const ptrdiff_t _Num = __last - __first;
>   if (_Num)
>     __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
>   return __result + _Num;
> }
>    };
>
>  template<bool _IsMove, typename _II, typename _OI>
>    inline _OI
>    __copy_move_a(_II __first, _II __last, _OI __result)
>    {
>      typedef typename iterator_traits<_II>::value_type _ValueTypeI;
>      typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
>      typedef typename iterator_traits<_II>::iterator_category _Category;
>      const bool __simple = (__is_trivial(_ValueTypeI)
>        && __is_pointer<_II>::__value
>        && __is_pointer<_OI>::__value
>        && __are_same<_ValueTypeI, _ValueTypeO>::__value);
>
>      return std::__copy_move<_IsMove, __simple,
>         _Category>::__copy_m(__first, __last, __result);
>    }
>
>
>
>  template<typename _CharT>
>    struct char_traits;
>
>  template<typename _CharT, typename _Traits>
>    class istreambuf_iterator;
>
>  template<typename _CharT, typename _Traits>
>    class ostreambuf_iterator;
>
>  template<bool _IsMove, typename _CharT>
>    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
>      ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
>    __copy_move_a2(_CharT*, _CharT*,
>     ostreambuf_iterator<_CharT, char_traits<_CharT> >);
>
>  template<bool _IsMove, typename _CharT>
>    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
>      ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
>    __copy_move_a2(const _CharT*, const _CharT*,
>     ostreambuf_iterator<_CharT, char_traits<_CharT> >);
>
>  template<bool _IsMove, typename _CharT>
>    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
>        _CharT*>::__type
>    __copy_move_a2(istreambuf_iterator<_CharT, char_traits<_CharT> >,
>     istreambuf_iterator<_CharT, char_traits<_CharT> >, _CharT*);
>
>  template<bool _IsMove, typename _II, typename _OI>
>    inline _OI
>    __copy_move_a2(_II __first, _II __last, _OI __result)
>    {
>      return _OI(std::__copy_move_a<_IsMove>(std::__niter_base(__first),
>          std::__niter_base(__last),
>          std::__niter_base(__result)));
>    }
># 444 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _II, typename _OI>
>    inline _OI
>    copy(_II __first, _II __last, _OI __result)
>    {
>
>     
>     
>
>      ;
>
>      return (std::__copy_move_a2<__is_move_iterator<_II>::__value>
>       (std::__miter_base(__first), std::__miter_base(__last),
>        __result));
>    }
># 477 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _II, typename _OI>
>    inline _OI
>    move(_II __first, _II __last, _OI __result)
>    {
>
>     
>     
>
>      ;
>
>      return std::__copy_move_a2<true>(std::__miter_base(__first),
>           std::__miter_base(__last), __result);
>    }
>
>
>
>
>
>
>  template<bool, bool, typename>
>    struct __copy_move_backward
>    {
>      template<typename _BI1, typename _BI2>
> static _BI2
> __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
> {
>   while (__first != __last)
>     *--__result = *--__last;
>   return __result;
> }
>    };
>
>
>  template<typename _Category>
>    struct __copy_move_backward<true, false, _Category>
>    {
>      template<typename _BI1, typename _BI2>
> static _BI2
> __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
> {
>   while (__first != __last)
>     *--__result = std::move(*--__last);
>   return __result;
> }
>    };
>
>
>  template<>
>    struct __copy_move_backward<false, false, random_access_iterator_tag>
>    {
>      template<typename _BI1, typename _BI2>
> static _BI2
> __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
> {
>   typename iterator_traits<_BI1>::difference_type __n;
>   for (__n = __last - __first; __n > 0; --__n)
>     *--__result = *--__last;
>   return __result;
> }
>    };
>
>
>  template<>
>    struct __copy_move_backward<true, false, random_access_iterator_tag>
>    {
>      template<typename _BI1, typename _BI2>
> static _BI2
> __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
> {
>   typename iterator_traits<_BI1>::difference_type __n;
>   for (__n = __last - __first; __n > 0; --__n)
>     *--__result = std::move(*--__last);
>   return __result;
> }
>    };
>
>
>  template<bool _IsMove>
>    struct __copy_move_backward<_IsMove, true, random_access_iterator_tag>
>    {
>      template<typename _Tp>
> static _Tp*
> __copy_move_b(const _Tp* __first, const _Tp* __last, _Tp* __result)
> {
>
>   using __assignable = conditional<_IsMove,
>        is_move_assignable<_Tp>,
>        is_copy_assignable<_Tp>>;
>
>   static_assert( __assignable::type::value, "type is not assignable" );
>
>   const ptrdiff_t _Num = __last - __first;
>   if (_Num)
>     __builtin_memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
>   return __result - _Num;
> }
>    };
>
>  template<bool _IsMove, typename _BI1, typename _BI2>
>    inline _BI2
>    __copy_move_backward_a(_BI1 __first, _BI1 __last, _BI2 __result)
>    {
>      typedef typename iterator_traits<_BI1>::value_type _ValueType1;
>      typedef typename iterator_traits<_BI2>::value_type _ValueType2;
>      typedef typename iterator_traits<_BI1>::iterator_category _Category;
>      const bool __simple = (__is_trivial(_ValueType1)
>        && __is_pointer<_BI1>::__value
>        && __is_pointer<_BI2>::__value
>        && __are_same<_ValueType1, _ValueType2>::__value);
>
>      return std::__copy_move_backward<_IsMove, __simple,
>           _Category>::__copy_move_b(__first,
>         __last,
>         __result);
>    }
>
>  template<bool _IsMove, typename _BI1, typename _BI2>
>    inline _BI2
>    __copy_move_backward_a2(_BI1 __first, _BI1 __last, _BI2 __result)
>    {
>      return _BI2(std::__copy_move_backward_a<_IsMove>
>    (std::__niter_base(__first), std::__niter_base(__last),
>     std::__niter_base(__result)));
>    }
># 620 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _BI1, typename _BI2>
>    inline _BI2
>    copy_backward(_BI1 __first, _BI1 __last, _BI2 __result)
>    {
>
>     
>     
>     
>
>
>      ;
>
>      return (std::__copy_move_backward_a2<__is_move_iterator<_BI1>::__value>
>       (std::__miter_base(__first), std::__miter_base(__last),
>        __result));
>    }
># 656 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _BI1, typename _BI2>
>    inline _BI2
>    move_backward(_BI1 __first, _BI1 __last, _BI2 __result)
>    {
>
>     
>     
>     
>
>
>      ;
>
>      return std::__copy_move_backward_a2<true>(std::__miter_base(__first),
>      std::__miter_base(__last),
>      __result);
>    }
>
>
>
>
>
>
>  template<typename _ForwardIterator, typename _Tp>
>    inline typename
>    __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, void>::__type
>    __fill_a(_ForwardIterator __first, _ForwardIterator __last,
>       const _Tp& __value)
>    {
>      for (; __first != __last; ++__first)
> *__first = __value;
>    }
>
>  template<typename _ForwardIterator, typename _Tp>
>    inline typename
>    __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, void>::__type
>    __fill_a(_ForwardIterator __first, _ForwardIterator __last,
>      const _Tp& __value)
>    {
>      const _Tp __tmp = __value;
>      for (; __first != __last; ++__first)
> *__first = __tmp;
>    }
>
>
>  template<typename _Tp>
>    inline typename
>    __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
>    __fill_a(_Tp* __first, _Tp* __last, const _Tp& __c)
>    {
>      const _Tp __tmp = __c;
>      if (const size_t __len = __last - __first)
> __builtin_memset(__first, static_cast<unsigned char>(__tmp), __len);
>    }
># 722 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _ForwardIterator, typename _Tp>
>    inline void
>    fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
>    {
>
>     
>
>      ;
>
>      std::__fill_a(std::__niter_base(__first), std::__niter_base(__last),
>      __value);
>    }
>
>  template<typename _OutputIterator, typename _Size, typename _Tp>
>    inline typename
>    __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, _OutputIterator>::__type
>    __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
>    {
>      for (__decltype(__n + 0) __niter = __n;
>    __niter > 0; --__niter, (void) ++__first)
> *__first = __value;
>      return __first;
>    }
>
>  template<typename _OutputIterator, typename _Size, typename _Tp>
>    inline typename
>    __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, _OutputIterator>::__type
>    __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
>    {
>      const _Tp __tmp = __value;
>      for (__decltype(__n + 0) __niter = __n;
>    __niter > 0; --__niter, (void) ++__first)
> *__first = __tmp;
>      return __first;
>    }
>
>  template<typename _Size, typename _Tp>
>    inline typename
>    __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, _Tp*>::__type
>    __fill_n_a(_Tp* __first, _Size __n, const _Tp& __c)
>    {
>      std::__fill_a(__first, __first + __n, __c);
>      return __first + __n;
>    }
># 782 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _OI, typename _Size, typename _Tp>
>    inline _OI
>    fill_n(_OI __first, _Size __n, const _Tp& __value)
>    {
>
>     
>
>      return _OI(std::__fill_n_a(std::__niter_base(__first), __n, __value));
>    }
>
>  template<bool _BoolType>
>    struct __equal
>    {
>      template<typename _II1, typename _II2>
> static bool
> equal(_II1 __first1, _II1 __last1, _II2 __first2)
> {
>   for (; __first1 != __last1; ++__first1, (void) ++__first2)
>     if (!(*__first1 == *__first2))
>       return false;
>   return true;
> }
>    };
>
>  template<>
>    struct __equal<true>
>    {
>      template<typename _Tp>
> static bool
> equal(const _Tp* __first1, const _Tp* __last1, const _Tp* __first2)
> {
>   if (const size_t __len = (__last1 - __first1))
>     return !__builtin_memcmp(__first1, __first2, sizeof(_Tp) * __len);
>   return true;
> }
>    };
>
>  template<typename _II1, typename _II2>
>    inline bool
>    __equal_aux(_II1 __first1, _II1 __last1, _II2 __first2)
>    {
>      typedef typename iterator_traits<_II1>::value_type _ValueType1;
>      typedef typename iterator_traits<_II2>::value_type _ValueType2;
>      const bool __simple = ((__is_integer<_ValueType1>::__value
>         || __is_pointer<_ValueType1>::__value)
>        && __is_pointer<_II1>::__value
>        && __is_pointer<_II2>::__value
>        && __are_same<_ValueType1, _ValueType2>::__value);
>
>      return std::__equal<__simple>::equal(__first1, __last1, __first2);
>    }
>
>  template<typename, typename>
>    struct __lc_rai
>    {
>      template<typename _II1, typename _II2>
> static _II1
> __newlast1(_II1, _II1 __last1, _II2, _II2)
> { return __last1; }
>
>      template<typename _II>
> static bool
> __cnd2(_II __first, _II __last)
> { return __first != __last; }
>    };
>
>  template<>
>    struct __lc_rai<random_access_iterator_tag, random_access_iterator_tag>
>    {
>      template<typename _RAI1, typename _RAI2>
> static _RAI1
> __newlast1(_RAI1 __first1, _RAI1 __last1,
>     _RAI2 __first2, _RAI2 __last2)
> {
>   const typename iterator_traits<_RAI1>::difference_type
>     __diff1 = __last1 - __first1;
>   const typename iterator_traits<_RAI2>::difference_type
>     __diff2 = __last2 - __first2;
>   return __diff2 < __diff1 ? __first1 + __diff2 : __last1;
> }
>
>      template<typename _RAI>
> static bool
> __cnd2(_RAI, _RAI)
> { return true; }
>    };
>
>  template<typename _II1, typename _II2, typename _Compare>
>    bool
>    __lexicographical_compare_impl(_II1 __first1, _II1 __last1,
>       _II2 __first2, _II2 __last2,
>       _Compare __comp)
>    {
>      typedef typename iterator_traits<_II1>::iterator_category _Category1;
>      typedef typename iterator_traits<_II2>::iterator_category _Category2;
>      typedef std::__lc_rai<_Category1, _Category2> __rai_type;
>
>      __last1 = __rai_type::__newlast1(__first1, __last1, __first2, __last2);
>      for (; __first1 != __last1 && __rai_type::__cnd2(__first2, __last2);
>    ++__first1, (void)++__first2)
> {
>   if (__comp(__first1, __first2))
>     return true;
>   if (__comp(__first2, __first1))
>     return false;
> }
>      return __first1 == __last1 && __first2 != __last2;
>    }
>
>  template<bool _BoolType>
>    struct __lexicographical_compare
>    {
>      template<typename _II1, typename _II2>
> static bool __lc(_II1, _II1, _II2, _II2);
>    };
>
>  template<bool _BoolType>
>    template<typename _II1, typename _II2>
>      bool
>      __lexicographical_compare<_BoolType>::
>      __lc(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
>      {
> return std::__lexicographical_compare_impl(__first1, __last1,
>         __first2, __last2,
>     __gnu_cxx::__ops::__iter_less_iter());
>      }
>
>  template<>
>    struct __lexicographical_compare<true>
>    {
>      template<typename _Tp, typename _Up>
> static bool
> __lc(const _Tp* __first1, const _Tp* __last1,
>      const _Up* __first2, const _Up* __last2)
> {
>   const size_t __len1 = __last1 - __first1;
>   const size_t __len2 = __last2 - __first2;
>   if (const size_t __len = std::min(__len1, __len2))
>     if (int __result = __builtin_memcmp(__first1, __first2, __len))
>       return __result < 0;
>   return __len1 < __len2;
> }
>    };
>
>  template<typename _II1, typename _II2>
>    inline bool
>    __lexicographical_compare_aux(_II1 __first1, _II1 __last1,
>      _II2 __first2, _II2 __last2)
>    {
>      typedef typename iterator_traits<_II1>::value_type _ValueType1;
>      typedef typename iterator_traits<_II2>::value_type _ValueType2;
>      const bool __simple =
> (__is_byte<_ValueType1>::__value && __is_byte<_ValueType2>::__value
>  && !__gnu_cxx::__numeric_traits<_ValueType1>::__is_signed
>  && !__gnu_cxx::__numeric_traits<_ValueType2>::__is_signed
>  && __is_pointer<_II1>::__value
>  && __is_pointer<_II2>::__value);
>
>      return std::__lexicographical_compare<__simple>::__lc(__first1, __last1,
>           __first2, __last2);
>    }
>
>  template<typename _ForwardIterator, typename _Tp, typename _Compare>
>    _ForwardIterator
>    __lower_bound(_ForwardIterator __first, _ForwardIterator __last,
>    const _Tp& __val, _Compare __comp)
>    {
>      typedef typename iterator_traits<_ForwardIterator>::difference_type
> _DistanceType;
>
>      _DistanceType __len = std::distance(__first, __last);
>
>      while (__len > 0)
> {
>   _DistanceType __half = __len >> 1;
>   _ForwardIterator __middle = __first;
>   std::advance(__middle, __half);
>   if (__comp(__middle, __val))
>     {
>       __first = __middle;
>       ++__first;
>       __len = __len - __half - 1;
>     }
>   else
>     __len = __half;
> }
>      return __first;
>    }
># 982 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _ForwardIterator, typename _Tp>
>    inline _ForwardIterator
>    lower_bound(_ForwardIterator __first, _ForwardIterator __last,
>  const _Tp& __val)
>    {
>
>     
>     
>
>      ;
>
>      return std::__lower_bound(__first, __last, __val,
>    __gnu_cxx::__ops::__iter_less_val());
>    }
>
>
>
>  inline constexpr int
>  __lg(int __n)
>  { return sizeof(int) * 8 - 1 - __builtin_clz(__n); }
>
>  inline constexpr unsigned
>  __lg(unsigned __n)
>  { return sizeof(int) * 8 - 1 - __builtin_clz(__n); }
>
>  inline constexpr long
>  __lg(long __n)
>  { return sizeof(long) * 8 - 1 - __builtin_clzl(__n); }
>
>  inline constexpr unsigned long
>  __lg(unsigned long __n)
>  { return sizeof(long) * 8 - 1 - __builtin_clzl(__n); }
>
>  inline constexpr long long
>  __lg(long long __n)
>  { return sizeof(long long) * 8 - 1 - __builtin_clzll(__n); }
>
>  inline constexpr unsigned long long
>  __lg(unsigned long long __n)
>  { return sizeof(long long) * 8 - 1 - __builtin_clzll(__n); }
>
>
># 1037 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _II1, typename _II2>
>    inline bool
>    equal(_II1 __first1, _II1 __last1, _II2 __first2)
>    {
>
>     
>     
>     
>
>
>      ;
>
>      return std::__equal_aux(std::__niter_base(__first1),
>         std::__niter_base(__last1),
>         std::__niter_base(__first2));
>    }
># 1069 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
>    inline bool
>    equal(_IIter1 __first1, _IIter1 __last1,
>   _IIter2 __first2, _BinaryPredicate __binary_pred)
>    {
>
>     
>     
>      ;
>
>      for (; __first1 != __last1; ++__first1, (void)++__first2)
> if (!bool(__binary_pred(*__first1, *__first2)))
>   return false;
>      return true;
>    }
>
>
>
>  template<typename _II1, typename _II2>
>    inline bool
>    __equal4(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
>    {
>      using _RATag = random_access_iterator_tag;
>      using _Cat1 = typename iterator_traits<_II1>::iterator_category;
>      using _Cat2 = typename iterator_traits<_II2>::iterator_category;
>      using _RAIters = __and_<is_same<_Cat1, _RATag>, is_same<_Cat2, _RATag>>;
>      if (_RAIters())
> {
>   auto __d1 = std::distance(__first1, __last1);
>   auto __d2 = std::distance(__first2, __last2);
>   if (__d1 != __d2)
>     return false;
>   return std::equal(__first1, __last1, __first2);
> }
>
>      for (; __first1 != __last1 && __first2 != __last2;
>   ++__first1, (void)++__first2)
> if (!(*__first1 == *__first2))
>   return false;
>      return __first1 == __last1 && __first2 == __last2;
>    }
>
>
>  template<typename _II1, typename _II2, typename _BinaryPredicate>
>    inline bool
>    __equal4(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2,
>      _BinaryPredicate __binary_pred)
>    {
>      using _RATag = random_access_iterator_tag;
>      using _Cat1 = typename iterator_traits<_II1>::iterator_category;
>      using _Cat2 = typename iterator_traits<_II2>::iterator_category;
>      using _RAIters = __and_<is_same<_Cat1, _RATag>, is_same<_Cat2, _RATag>>;
>      if (_RAIters())
> {
>   auto __d1 = std::distance(__first1, __last1);
>   auto __d2 = std::distance(__first2, __last2);
>   if (__d1 != __d2)
>     return false;
>   return std::equal(__first1, __last1, __first2,
>           __binary_pred);
> }
>
>      for (; __first1 != __last1 && __first2 != __last2;
>   ++__first1, (void)++__first2)
> if (!bool(__binary_pred(*__first1, *__first2)))
>   return false;
>      return __first1 == __last1 && __first2 == __last2;
>    }
># 1156 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _II1, typename _II2>
>    inline bool
>    equal(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
>    {
>
>     
>     
>     
>
>
>      ;
>      ;
>
>      return std::__equal4(__first1, __last1, __first2, __last2);
>    }
># 1188 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
>    inline bool
>    equal(_IIter1 __first1, _IIter1 __last1,
>   _IIter2 __first2, _IIter2 __last2, _BinaryPredicate __binary_pred)
>    {
>
>     
>     
>      ;
>      ;
>
>      return std::__equal4(__first1, __last1, __first2, __last2,
>          __binary_pred);
>    }
># 1219 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _II1, typename _II2>
>    inline bool
>    lexicographical_compare(_II1 __first1, _II1 __last1,
>       _II2 __first2, _II2 __last2)
>    {
>
>
>
>
>
>     
>     
>     
>     
>      ;
>      ;
>
>      return std::__lexicographical_compare_aux(std::__niter_base(__first1),
>      std::__niter_base(__last1),
>      std::__niter_base(__first2),
>      std::__niter_base(__last2));
>    }
># 1255 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _II1, typename _II2, typename _Compare>
>    inline bool
>    lexicographical_compare(_II1 __first1, _II1 __last1,
>       _II2 __first2, _II2 __last2, _Compare __comp)
>    {
>
>     
>     
>      ;
>      ;
>
>      return std::__lexicographical_compare_impl
> (__first1, __last1, __first2, __last2,
>  __gnu_cxx::__ops::__iter_comp_iter(__comp));
>    }
>
>  template<typename _InputIterator1, typename _InputIterator2,
>    typename _BinaryPredicate>
>    pair<_InputIterator1, _InputIterator2>
>    __mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
>        _InputIterator2 __first2, _BinaryPredicate __binary_pred)
>    {
>      while (__first1 != __last1 && __binary_pred(__first1, __first2))
> {
>   ++__first1;
>   ++__first2;
> }
>      return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
>    }
># 1298 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _InputIterator1, typename _InputIterator2>
>    inline pair<_InputIterator1, _InputIterator2>
>    mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
>      _InputIterator2 __first2)
>    {
>
>     
>     
>     
>
>
>      ;
>
>      return std::__mismatch(__first1, __last1, __first2,
>        __gnu_cxx::__ops::__iter_equal_to_iter());
>    }
># 1331 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _InputIterator1, typename _InputIterator2,
>    typename _BinaryPredicate>
>    inline pair<_InputIterator1, _InputIterator2>
>    mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
>      _InputIterator2 __first2, _BinaryPredicate __binary_pred)
>    {
>
>     
>     
>      ;
>
>      return std::__mismatch(__first1, __last1, __first2,
> __gnu_cxx::__ops::__iter_comp_iter(__binary_pred));
>    }
>
>
>
>  template<typename _InputIterator1, typename _InputIterator2,
>    typename _BinaryPredicate>
>    pair<_InputIterator1, _InputIterator2>
>    __mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
>        _InputIterator2 __first2, _InputIterator2 __last2,
>        _BinaryPredicate __binary_pred)
>    {
>      while (__first1 != __last1 && __first2 != __last2
>      && __binary_pred(__first1, __first2))
> {
>   ++__first1;
>   ++__first2;
> }
>      return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
>    }
># 1378 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _InputIterator1, typename _InputIterator2>
>    inline pair<_InputIterator1, _InputIterator2>
>    mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
>      _InputIterator2 __first2, _InputIterator2 __last2)
>    {
>
>     
>     
>     
>
>
>      ;
>      ;
>
>      return std::__mismatch(__first1, __last1, __first2, __last2,
>        __gnu_cxx::__ops::__iter_equal_to_iter());
>    }
># 1413 "/usr/include/c++/8/bits/stl_algobase.h" 3
>  template<typename _InputIterator1, typename _InputIterator2,
>    typename _BinaryPredicate>
>    inline pair<_InputIterator1, _InputIterator2>
>    mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
>      _InputIterator2 __first2, _InputIterator2 __last2,
>      _BinaryPredicate __binary_pred)
>    {
>
>     
>     
>      ;
>      ;
>
>      return std::__mismatch(__first1, __last1, __first2, __last2,
>        __gnu_cxx::__ops::__iter_comp_iter(__binary_pred));
>    }
>
>
>
>
>}
># 40 "/usr/include/c++/8/bits/char_traits.h" 2 3
>
># 1 "/usr/include/c++/8/cwchar" 1 3
># 39 "/usr/include/c++/8/cwchar" 3
>       
># 40 "/usr/include/c++/8/cwchar" 3
># 42 "/usr/include/c++/8/bits/char_traits.h" 2 3
>
>
>
>
>
>namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
>{
>
># 61 "/usr/include/c++/8/bits/char_traits.h" 3
>  template<typename _CharT>
>    struct _Char_types
>    {
>      typedef unsigned long int_type;
>      typedef std::streampos pos_type;
>      typedef std::streamoff off_type;
>      typedef std::mbstate_t state_type;
>    };
># 86 "/usr/include/c++/8/bits/char_traits.h" 3
>  template<typename _CharT>
>    struct char_traits
>    {
>      typedef _CharT char_type;
>      typedef typename _Char_types<_CharT>::int_type int_type;
>      typedef typename _Char_types<_CharT>::pos_type pos_type;
>      typedef typename _Char_types<_CharT>::off_type off_type;
>      typedef typename _Char_types<_CharT>::state_type state_type;
>
>      static constexpr void
>      assign(char_type& __c1, const char_type& __c2)
>      { __c1 = __c2; }
>
>      static constexpr bool
>      eq(const char_type& __c1, const char_type& __c2)
>      { return __c1 == __c2; }
>
>      static constexpr bool
>      lt(const char_type& __c1, const char_type& __c2)
>      { return __c1 < __c2; }
>
>      static constexpr int
>      compare(const char_type* __s1, const char_type* __s2, std::size_t __n);
>
>      static constexpr std::size_t
>      length(const char_type* __s);
>
>      static constexpr const char_type*
>      find(const char_type* __s, std::size_t __n, const char_type& __a);
>
>      static char_type*
>      move(char_type* __s1, const char_type* __s2, std::size_t __n);
>
>      static char_type*
>      copy(char_type* __s1, const char_type* __s2, std::size_t __n);
>
>      static char_type*
>      assign(char_type* __s, std::size_t __n, char_type __a);
>
>      static constexpr char_type
>      to_char_type(const int_type& __c)
>      { return static_cast<char_type>(__c); }
>
>      static constexpr int_type
>      to_int_type(const char_type& __c)
>      { return static_cast<int_type>(__c); }
>
>      static constexpr bool
>      eq_int_type(const int_type& __c1, const int_type& __c2)
>      { return __c1 == __c2; }
>
>      static constexpr int_type
>      eof()
>      { return static_cast<int_type>(-1); }
>
>      static constexpr int_type
>      not_eof(const int_type& __c)
>      { return !eq_int_type(__c, eof()) ? __c : to_int_type(char_type()); }
>    };
>
>
>
>  template<typename _CharT>
>    constexpr int
>    char_traits<_CharT>::
>    compare(const char_type* __s1, const char_type* __s2, std::size_t __n)
>    {
>      for (std::size_t __i = 0; __i < __n; ++__i)
> if (lt(__s1[__i], __s2[__i]))
>   return -1;
> else if (lt(__s2[__i], __s1[__i]))
>   return 1;
>      return 0;
>    }
>
>  template<typename _CharT>
>    constexpr std::size_t
>    char_traits<_CharT>::
>    length(const char_type* __p)
>    {
>      std::size_t __i = 0;
>      while (!eq(__p[__i], char_type()))
>        ++__i;
>      return __i;
>    }
>
>  template<typename _CharT>
>    constexpr const typename char_traits<_CharT>::char_type*
>    char_traits<_CharT>::
>    find(const char_type* __s, std::size_t __n, const char_type& __a)
>    {
>      for (std::size_t __i = 0; __i < __n; ++__i)
>        if (eq(__s[__i], __a))
>          return __s + __i;
>      return 0;
>    }
>
>  template<typename _CharT>
>    typename char_traits<_CharT>::char_type*
>    char_traits<_CharT>::
>    move(char_type* __s1, const char_type* __s2, std::size_t __n)
>    {
>      return static_cast<_CharT*>(__builtin_memmove(__s1, __s2,
>          __n * sizeof(char_type)));
>    }
>
>  template<typename _CharT>
>    typename char_traits<_CharT>::char_type*
>    char_traits<_CharT>::
>    copy(char_type* __s1, const char_type* __s2, std::size_t __n)
>    {
>
>      std::copy(__s2, __s2 + __n, __s1);
>      return __s1;
>    }
>
>  template<typename _CharT>
>    typename char_traits<_CharT>::char_type*
>    char_traits<_CharT>::
>    assign(char_type* __s, std::size_t __n, char_type __a)
>    {
>
>      std::fill_n(__s, __n, __a);
>      return __s;
>    }
>
>
>}
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 268 "/usr/include/c++/8/bits/char_traits.h" 3
>  template<class _CharT>
>    struct char_traits : public __gnu_cxx::char_traits<_CharT>
>    { };
>
>
>
>  template<>
>    struct char_traits<char>
>    {
>      typedef char char_type;
>      typedef int int_type;
>      typedef streampos pos_type;
>      typedef streamoff off_type;
>      typedef mbstate_t state_type;
>
>      static void
>      assign(char_type& __c1, const char_type& __c2) noexcept
>      { __c1 = __c2; }
>
>      static constexpr bool
>      eq(const char_type& __c1, const char_type& __c2) noexcept
>      { return __c1 == __c2; }
>
>      static constexpr bool
>      lt(const char_type& __c1, const char_type& __c2) noexcept
>      {
>
> return (static_cast<unsigned char>(__c1)
>  < static_cast<unsigned char>(__c2));
>      }
>
>      static int
>      compare(const char_type* __s1, const char_type* __s2, size_t __n)
>      {
>
>
>
>
>
>
> if (__n == 0)
>   return 0;
> return __builtin_memcmp(__s1, __s2, __n);
>      }
>
>      static size_t
>      length(const char_type* __s)
>      {
>
>
>
>
> return __builtin_strlen(__s);
>      }
>
>      static const char_type*
>      find(const char_type* __s, size_t __n, const char_type& __a)
>      {
>
>
>
>
>
>
> if (__n == 0)
>   return 0;
> return static_cast<const char_type*>(__builtin_memchr(__s, __a, __n));
>      }
>
>      static char_type*
>      move(char_type* __s1, const char_type* __s2, size_t __n)
>      {
> if (__n == 0)
>   return __s1;
> return static_cast<char_type*>(__builtin_memmove(__s1, __s2, __n));
>      }
>
>      static char_type*
>      copy(char_type* __s1, const char_type* __s2, size_t __n)
>      {
> if (__n == 0)
>   return __s1;
> return static_cast<char_type*>(__builtin_memcpy(__s1, __s2, __n));
>      }
>
>      static char_type*
>      assign(char_type* __s, size_t __n, char_type __a)
>      {
> if (__n == 0)
>   return __s;
> return static_cast<char_type*>(__builtin_memset(__s, __a, __n));
>      }
>
>      static constexpr char_type
>      to_char_type(const int_type& __c) noexcept
>      { return static_cast<char_type>(__c); }
>
>
>
>      static constexpr int_type
>      to_int_type(const char_type& __c) noexcept
>      { return static_cast<int_type>(static_cast<unsigned char>(__c)); }
>
>      static constexpr bool
>      eq_int_type(const int_type& __c1, const int_type& __c2) noexcept
>      { return __c1 == __c2; }
>
>      static constexpr int_type
>      eof() noexcept
>      { return static_cast<int_type>(-1); }
>
>      static constexpr int_type
>      not_eof(const int_type& __c) noexcept
>      { return (__c == eof()) ? 0 : __c; }
>  };
>
>
>
>
>  template<>
>    struct char_traits<wchar_t>
>    {
>      typedef wchar_t char_type;
>      typedef wint_t int_type;
>      typedef streamoff off_type;
>      typedef wstreampos pos_type;
>      typedef mbstate_t state_type;
>
>      static void
>      assign(char_type& __c1, const char_type& __c2) noexcept
>      { __c1 = __c2; }
>
>      static constexpr bool
>      eq(const char_type& __c1, const char_type& __c2) noexcept
>      { return __c1 == __c2; }
>
>      static constexpr bool
>      lt(const char_type& __c1, const char_type& __c2) noexcept
>      { return __c1 < __c2; }
>
>      static int
>      compare(const char_type* __s1, const char_type* __s2, size_t __n)
>      {
>
>
>
>
>
>
> if (__n == 0)
>   return 0;
> else
>   return wmemcmp(__s1, __s2, __n);
>      }
>
>      static size_t
>      length(const char_type* __s)
>      {
>
>
>
>
>
>   return wcslen(__s);
>      }
>
>      static const char_type*
>      find(const char_type* __s, size_t __n, const char_type& __a)
>      {
>
>
>
>
>
>
> if (__n == 0)
>   return 0;
> else
>   return wmemchr(__s, __a, __n);
>      }
>
>      static char_type*
>      move(char_type* __s1, const char_type* __s2, size_t __n)
>      {
> if (__n == 0)
>   return __s1;
> return wmemmove(__s1, __s2, __n);
>      }
>
>      static char_type*
>      copy(char_type* __s1, const char_type* __s2, size_t __n)
>      {
> if (__n == 0)
>   return __s1;
> return wmemcpy(__s1, __s2, __n);
>      }
>
>      static char_type*
>      assign(char_type* __s, size_t __n, char_type __a)
>      {
> if (__n == 0)
>   return __s;
> return wmemset(__s, __a, __n);
>      }
>
>      static constexpr char_type
>      to_char_type(const int_type& __c) noexcept
>      { return char_type(__c); }
>
>      static constexpr int_type
>      to_int_type(const char_type& __c) noexcept
>      { return int_type(__c); }
>
>      static constexpr bool
>      eq_int_type(const int_type& __c1, const int_type& __c2) noexcept
>      { return __c1 == __c2; }
>
>      static constexpr int_type
>      eof() noexcept
>      { return static_cast<int_type>((0xffffffffu)); }
>
>      static constexpr int_type
>      not_eof(const int_type& __c) noexcept
>      { return eq_int_type(__c, eof()) ? 0 : __c; }
>  };
>
>
>
>}
>
>
>
>
># 1 "/usr/include/c++/8/cstdint" 1 3
># 32 "/usr/include/c++/8/cstdint" 3
>       
># 33 "/usr/include/c++/8/cstdint" 3
># 41 "/usr/include/c++/8/cstdint" 3
># 1 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stdint.h" 1 3 4
># 9 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stdint.h" 3 4
># 1 "/usr/include/stdint.h" 1 3 4
># 26 "/usr/include/stdint.h" 3 4
># 1 "/usr/include/bits/libc-header-start.h" 1 3 4
># 27 "/usr/include/stdint.h" 2 3 4
># 1 "/usr/include/bits/types.h" 1 3 4
># 27 "/usr/include/bits/types.h" 3 4
># 1 "/usr/include/bits/wordsize.h" 1 3 4
># 28 "/usr/include/bits/types.h" 2 3 4
>
>
>typedef unsigned char __u_char;
>typedef unsigned short int __u_short;
>typedef unsigned int __u_int;
>typedef unsigned long int __u_long;
>
>
>typedef signed char __int8_t;
>typedef unsigned char __uint8_t;
>typedef signed short int __int16_t;
>typedef unsigned short int __uint16_t;
>typedef signed int __int32_t;
>typedef unsigned int __uint32_t;
>
>typedef signed long int __int64_t;
>typedef unsigned long int __uint64_t;
>
>
>
>
>
>
>typedef __int8_t __int_least8_t;
>typedef __uint8_t __uint_least8_t;
>typedef __int16_t __int_least16_t;
>typedef __uint16_t __uint_least16_t;
>typedef __int32_t __int_least32_t;
>typedef __uint32_t __uint_least32_t;
>typedef __int64_t __int_least64_t;
>typedef __uint64_t __uint_least64_t;
>
>
>
>typedef long int __quad_t;
>typedef unsigned long int __u_quad_t;
>
>
>
>
>
>
>
>typedef long int __intmax_t;
>typedef unsigned long int __uintmax_t;
># 140 "/usr/include/bits/types.h" 3 4
># 1 "/usr/include/bits/typesizes.h" 1 3 4
># 141 "/usr/include/bits/types.h" 2 3 4
>
>
>typedef unsigned long int __dev_t;
>typedef unsigned int __uid_t;
>typedef unsigned int __gid_t;
>typedef unsigned long int __ino_t;
>typedef unsigned long int __ino64_t;
>typedef unsigned int __mode_t;
>typedef unsigned long int __nlink_t;
>typedef long int __off_t;
>typedef long int __off64_t;
>typedef int __pid_t;
>typedef struct { int __val[2]; } __fsid_t;
>typedef long int __clock_t;
>typedef unsigned long int __rlim_t;
>typedef unsigned long int __rlim64_t;
>typedef unsigned int __id_t;
>typedef long int __time_t;
>typedef unsigned int __useconds_t;
>typedef long int __suseconds_t;
>
>typedef int __daddr_t;
>typedef int __key_t;
>
>
>typedef int __clockid_t;
>
>
>typedef void * __timer_t;
>
>
>typedef long int __blksize_t;
>
>
>
>
>typedef long int __blkcnt_t;
>typedef long int __blkcnt64_t;
>
>
>typedef unsigned long int __fsblkcnt_t;
>typedef unsigned long int __fsblkcnt64_t;
>
>
>typedef unsigned long int __fsfilcnt_t;
>typedef unsigned long int __fsfilcnt64_t;
>
>
>typedef long int __fsword_t;
>
>typedef long int __ssize_t;
>
>
>typedef long int __syscall_slong_t;
>
>typedef unsigned long int __syscall_ulong_t;
>
>
>
>typedef __off64_t __loff_t;
>typedef char *__caddr_t;
>
>
>typedef long int __intptr_t;
>
>
>typedef unsigned int __socklen_t;
>
>
>
>
>typedef int __sig_atomic_t;
># 28 "/usr/include/stdint.h" 2 3 4
>
># 1 "/usr/include/bits/wordsize.h" 1 3 4
># 30 "/usr/include/stdint.h" 2 3 4
>
>
>
>
># 1 "/usr/include/bits/stdint-intn.h" 1 3 4
># 24 "/usr/include/bits/stdint-intn.h" 3 4
>typedef __int8_t int8_t;
>typedef __int16_t int16_t;
>typedef __int32_t int32_t;
>typedef __int64_t int64_t;
># 35 "/usr/include/stdint.h" 2 3 4
>
>
># 1 "/usr/include/bits/stdint-uintn.h" 1 3 4
># 24 "/usr/include/bits/stdint-uintn.h" 3 4
>typedef __uint8_t uint8_t;
>typedef __uint16_t uint16_t;
>typedef __uint32_t uint32_t;
>typedef __uint64_t uint64_t;
># 38 "/usr/include/stdint.h" 2 3 4
>
>
>
>
>
>typedef __int_least8_t int_least8_t;
>typedef __int_least16_t int_least16_t;
>typedef __int_least32_t int_least32_t;
>typedef __int_least64_t int_least64_t;
>
>
>typedef __uint_least8_t uint_least8_t;
>typedef __uint_least16_t uint_least16_t;
>typedef __uint_least32_t uint_least32_t;
>typedef __uint_least64_t uint_least64_t;
>
>
>
>
>
>typedef signed char int_fast8_t;
>
>typedef long int int_fast16_t;
>typedef long int int_fast32_t;
>typedef long int int_fast64_t;
># 71 "/usr/include/stdint.h" 3 4
>typedef unsigned char uint_fast8_t;
>
>typedef unsigned long int uint_fast16_t;
>typedef unsigned long int uint_fast32_t;
>typedef unsigned long int uint_fast64_t;
># 87 "/usr/include/stdint.h" 3 4
>typedef long int intptr_t;
>
>
>typedef unsigned long int uintptr_t;
># 101 "/usr/include/stdint.h" 3 4
>typedef __intmax_t intmax_t;
>typedef __uintmax_t uintmax_t;
># 10 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stdint.h" 2 3 4
># 42 "/usr/include/c++/8/cstdint" 2 3
>
>
>
>
>namespace std
>{
>  using ::int8_t;
>  using ::int16_t;
>  using ::int32_t;
>  using ::int64_t;
>
>  using ::int_fast8_t;
>  using ::int_fast16_t;
>  using ::int_fast32_t;
>  using ::int_fast64_t;
>
>  using ::int_least8_t;
>  using ::int_least16_t;
>  using ::int_least32_t;
>  using ::int_least64_t;
>
>  using ::intmax_t;
>  using ::intptr_t;
>
>  using ::uint8_t;
>  using ::uint16_t;
>  using ::uint32_t;
>  using ::uint64_t;
>
>  using ::uint_fast8_t;
>  using ::uint_fast16_t;
>  using ::uint_fast32_t;
>  using ::uint_fast64_t;
>
>  using ::uint_least8_t;
>  using ::uint_least16_t;
>  using ::uint_least32_t;
>  using ::uint_least64_t;
>
>  using ::uintmax_t;
>  using ::uintptr_t;
>}
># 502 "/usr/include/c++/8/bits/char_traits.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  template<>
>    struct char_traits<char16_t>
>    {
>      typedef char16_t char_type;
>      typedef uint_least16_t int_type;
>      typedef streamoff off_type;
>      typedef u16streampos pos_type;
>      typedef mbstate_t state_type;
>
>      static void
>      assign(char_type& __c1, const char_type& __c2) noexcept
>      { __c1 = __c2; }
>
>      static constexpr bool
>      eq(const char_type& __c1, const char_type& __c2) noexcept
>      { return __c1 == __c2; }
>
>      static constexpr bool
>      lt(const char_type& __c1, const char_type& __c2) noexcept
>      { return __c1 < __c2; }
>
>      static int
>      compare(const char_type* __s1, const char_type* __s2, size_t __n)
>      {
> for (size_t __i = 0; __i < __n; ++__i)
>   if (lt(__s1[__i], __s2[__i]))
>     return -1;
>   else if (lt(__s2[__i], __s1[__i]))
>     return 1;
> return 0;
>      }
>
>      static size_t
>      length(const char_type* __s)
>      {
> size_t __i = 0;
> while (!eq(__s[__i], char_type()))
>   ++__i;
> return __i;
>      }
>
>      static const char_type*
>      find(const char_type* __s, size_t __n, const char_type& __a)
>      {
> for (size_t __i = 0; __i < __n; ++__i)
>   if (eq(__s[__i], __a))
>     return __s + __i;
> return 0;
>      }
>
>      static char_type*
>      move(char_type* __s1, const char_type* __s2, size_t __n)
>      {
> if (__n == 0)
>   return __s1;
> return (static_cast<char_type*>
>  (__builtin_memmove(__s1, __s2, __n * sizeof(char_type))));
>      }
>
>      static char_type*
>      copy(char_type* __s1, const char_type* __s2, size_t __n)
>      {
> if (__n == 0)
>   return __s1;
> return (static_cast<char_type*>
>  (__builtin_memcpy(__s1, __s2, __n * sizeof(char_type))));
>      }
>
>      static char_type*
>      assign(char_type* __s, size_t __n, char_type __a)
>      {
> for (size_t __i = 0; __i < __n; ++__i)
>   assign(__s[__i], __a);
> return __s;
>      }
>
>      static constexpr char_type
>      to_char_type(const int_type& __c) noexcept
>      { return char_type(__c); }
>
>      static constexpr int_type
>      to_int_type(const char_type& __c) noexcept
>      { return __c == eof() ? int_type(0xfffd) : int_type(__c); }
>
>      static constexpr bool
>      eq_int_type(const int_type& __c1, const int_type& __c2) noexcept
>      { return __c1 == __c2; }
>
>      static constexpr int_type
>      eof() noexcept
>      { return static_cast<int_type>(-1); }
>
>      static constexpr int_type
>      not_eof(const int_type& __c) noexcept
>      { return eq_int_type(__c, eof()) ? 0 : __c; }
>    };
>
>  template<>
>    struct char_traits<char32_t>
>    {
>      typedef char32_t char_type;
>      typedef uint_least32_t int_type;
>      typedef streamoff off_type;
>      typedef u32streampos pos_type;
>      typedef mbstate_t state_type;
>
>      static void
>      assign(char_type& __c1, const char_type& __c2) noexcept
>      { __c1 = __c2; }
>
>      static constexpr bool
>      eq(const char_type& __c1, const char_type& __c2) noexcept
>      { return __c1 == __c2; }
>
>      static constexpr bool
>      lt(const char_type& __c1, const char_type& __c2) noexcept
>      { return __c1 < __c2; }
>
>      static int
>      compare(const char_type* __s1, const char_type* __s2, size_t __n)
>      {
> for (size_t __i = 0; __i < __n; ++__i)
>   if (lt(__s1[__i], __s2[__i]))
>     return -1;
>   else if (lt(__s2[__i], __s1[__i]))
>     return 1;
> return 0;
>      }
>
>      static size_t
>      length(const char_type* __s)
>      {
> size_t __i = 0;
> while (!eq(__s[__i], char_type()))
>   ++__i;
> return __i;
>      }
>
>      static const char_type*
>      find(const char_type* __s, size_t __n, const char_type& __a)
>      {
> for (size_t __i = 0; __i < __n; ++__i)
>   if (eq(__s[__i], __a))
>     return __s + __i;
> return 0;
>      }
>
>      static char_type*
>      move(char_type* __s1, const char_type* __s2, size_t __n)
>      {
> if (__n == 0)
>   return __s1;
> return (static_cast<char_type*>
>  (__builtin_memmove(__s1, __s2, __n * sizeof(char_type))));
>      }
>
>      static char_type*
>      copy(char_type* __s1, const char_type* __s2, size_t __n)
>      {
> if (__n == 0)
>   return __s1;
> return (static_cast<char_type*>
>  (__builtin_memcpy(__s1, __s2, __n * sizeof(char_type))));
>      }
>
>      static char_type*
>      assign(char_type* __s, size_t __n, char_type __a)
>      {
> for (size_t __i = 0; __i < __n; ++__i)
>   assign(__s[__i], __a);
> return __s;
>      }
>
>      static constexpr char_type
>      to_char_type(const int_type& __c) noexcept
>      { return char_type(__c); }
>
>      static constexpr int_type
>      to_int_type(const char_type& __c) noexcept
>      { return int_type(__c); }
>
>      static constexpr bool
>      eq_int_type(const int_type& __c1, const int_type& __c2) noexcept
>      { return __c1 == __c2; }
>
>      static constexpr int_type
>      eof() noexcept
>      { return static_cast<int_type>(-1); }
>
>      static constexpr int_type
>      not_eof(const int_type& __c) noexcept
>      { return eq_int_type(__c, eof()) ? 0 : __c; }
>    };
>
>
>}
># 41 "/usr/include/c++/8/ios" 2 3
># 1 "/usr/include/c++/8/bits/localefwd.h" 1 3
># 37 "/usr/include/c++/8/bits/localefwd.h" 3
>       
># 38 "/usr/include/c++/8/bits/localefwd.h" 3
>
>
># 1 "/usr/include/c++/8/x86_64-redhat-linux/bits/c++locale.h" 1 3
># 39 "/usr/include/c++/8/x86_64-redhat-linux/bits/c++locale.h" 3
>       
># 40 "/usr/include/c++/8/x86_64-redhat-linux/bits/c++locale.h" 3
>
># 1 "/usr/include/c++/8/clocale" 1 3
># 39 "/usr/include/c++/8/clocale" 3
>       
># 40 "/usr/include/c++/8/clocale" 3
>
>
># 1 "/usr/include/locale.h" 1 3 4
># 28 "/usr/include/locale.h" 3 4
># 1 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 1 3 4
># 29 "/usr/include/locale.h" 2 3 4
># 1 "/usr/include/bits/locale.h" 1 3 4
># 30 "/usr/include/locale.h" 2 3 4
>
>extern "C" {
># 51 "/usr/include/locale.h" 3 4
>struct lconv
>{
>
>
>  char *decimal_point;
>  char *thousands_sep;
>
>
>
>
>
>  char *grouping;
>
>
>
>
>
>  char *int_curr_symbol;
>  char *currency_symbol;
>  char *mon_decimal_point;
>  char *mon_thousands_sep;
>  char *mon_grouping;
>  char *positive_sign;
>  char *negative_sign;
>  char int_frac_digits;
>  char frac_digits;
>
>  char p_cs_precedes;
>
>  char p_sep_by_space;
>
>  char n_cs_precedes;
>
>  char n_sep_by_space;
>
>
>
>
>
>
>  char p_sign_posn;
>  char n_sign_posn;
>
>
>  char int_p_cs_precedes;
>
>  char int_p_sep_by_space;
>
>  char int_n_cs_precedes;
>
>  char int_n_sep_by_space;
>
>
>
>
>
>
>  char int_p_sign_posn;
>  char int_n_sign_posn;
># 118 "/usr/include/locale.h" 3 4
>};
>
>
>
>extern char *setlocale (int __category, const char *__locale) throw ();
>
>
>extern struct lconv *localeconv (void) throw ();
># 141 "/usr/include/locale.h" 3 4
>extern locale_t newlocale (int __category_mask, const char *__locale,
>      locale_t __base) throw ();
># 176 "/usr/include/locale.h" 3 4
>extern locale_t duplocale (locale_t __dataset) throw ();
>
>
>
>extern void freelocale (locale_t __dataset) throw ();
>
>
>
>
>
>
>extern locale_t uselocale (locale_t __dataset) throw ();
>
>
>
>
>
>
>
>}
># 43 "/usr/include/c++/8/clocale" 2 3
># 51 "/usr/include/c++/8/clocale" 3
>namespace std
>{
>  using ::lconv;
>  using ::setlocale;
>  using ::localeconv;
>}
># 42 "/usr/include/c++/8/x86_64-redhat-linux/bits/c++locale.h" 2 3
>
>
>
>
>
>
>namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
>{
>
>
>  extern "C" __typeof(uselocale) __uselocale;
>
>
>}
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  typedef __locale_t __c_locale;
>
>
>
>
>
>  inline int
>  __convert_from_v(const __c_locale& __cloc __attribute__ ((__unused__)),
>     char* __out,
>     const int __size __attribute__ ((__unused__)),
>     const char* __fmt, ...)
>  {
>
>    __c_locale __old = __gnu_cxx::__uselocale(__cloc);
># 88 "/usr/include/c++/8/x86_64-redhat-linux/bits/c++locale.h" 3
>    __builtin_va_list __args;
>    __builtin_va_start(__args, __fmt);
>
>
>    const int __ret = __builtin_vsnprintf(__out, __size, __fmt, __args);
>
>
>
>
>    __builtin_va_end(__args);
>
>
>    __gnu_cxx::__uselocale(__old);
>
>
>
>
>
>
>
>    return __ret;
>  }
>
>
>}
># 41 "/usr/include/c++/8/bits/localefwd.h" 2 3
>
># 1 "/usr/include/c++/8/cctype" 1 3
># 39 "/usr/include/c++/8/cctype" 3
>       
># 40 "/usr/include/c++/8/cctype" 3
>
>
># 1 "/usr/include/ctype.h" 1 3 4
># 28 "/usr/include/ctype.h" 3 4
>extern "C" {
># 39 "/usr/include/ctype.h" 3 4
># 1 "/usr/include/endian.h" 1 3 4
># 36 "/usr/include/endian.h" 3 4
># 1 "/usr/include/bits/endian.h" 1 3 4
># 37 "/usr/include/endian.h" 2 3 4
># 60 "/usr/include/endian.h" 3 4
># 1 "/usr/include/bits/byteswap.h" 1 3 4
># 33 "/usr/include/bits/byteswap.h" 3 4
>static __inline __uint16_t
>__bswap_16 (__uint16_t __bsx)
>{
>
>  return __builtin_bswap16 (__bsx);
>
>
>
>}
>
>
>
>
>
>
>static __inline __uint32_t
>__bswap_32 (__uint32_t __bsx)
>{
>
>  return __builtin_bswap32 (__bsx);
>
>
>
>}
># 69 "/usr/include/bits/byteswap.h" 3 4
>__extension__ static __inline __uint64_t
>__bswap_64 (__uint64_t __bsx)
>{
>
>  return __builtin_bswap64 (__bsx);
>
>
>
>}
># 61 "/usr/include/endian.h" 2 3 4
># 1 "/usr/include/bits/uintn-identity.h" 1 3 4
># 32 "/usr/include/bits/uintn-identity.h" 3 4
>static __inline __uint16_t
>__uint16_identity (__uint16_t __x)
>{
>  return __x;
>}
>
>static __inline __uint32_t
>__uint32_identity (__uint32_t __x)
>{
>  return __x;
>}
>
>static __inline __uint64_t
>__uint64_identity (__uint64_t __x)
>{
>  return __x;
>}
># 62 "/usr/include/endian.h" 2 3 4
># 40 "/usr/include/ctype.h" 2 3 4
>
>
>
>
>
>
>enum
>{
>  _ISupper = ((0) < 8 ? ((1 << (0)) << 8) : ((1 << (0)) >> 8)),
>  _ISlower = ((1) < 8 ? ((1 << (1)) << 8) : ((1 << (1)) >> 8)),
>  _ISalpha = ((2) < 8 ? ((1 << (2)) << 8) : ((1 << (2)) >> 8)),
>  _ISdigit = ((3) < 8 ? ((1 << (3)) << 8) : ((1 << (3)) >> 8)),
>  _ISxdigit = ((4) < 8 ? ((1 << (4)) << 8) : ((1 << (4)) >> 8)),
>  _ISspace = ((5) < 8 ? ((1 << (5)) << 8) : ((1 << (5)) >> 8)),
>  _ISprint = ((6) < 8 ? ((1 << (6)) << 8) : ((1 << (6)) >> 8)),
>  _ISgraph = ((7) < 8 ? ((1 << (7)) << 8) : ((1 << (7)) >> 8)),
>  _ISblank = ((8) < 8 ? ((1 << (8)) << 8) : ((1 << (8)) >> 8)),
>  _IScntrl = ((9) < 8 ? ((1 << (9)) << 8) : ((1 << (9)) >> 8)),
>  _ISpunct = ((10) < 8 ? ((1 << (10)) << 8) : ((1 << (10)) >> 8)),
>  _ISalnum = ((11) < 8 ? ((1 << (11)) << 8) : ((1 << (11)) >> 8))
>};
># 79 "/usr/include/ctype.h" 3 4
>extern const unsigned short int **__ctype_b_loc (void)
>     throw () __attribute__ ((__const__));
>extern const __int32_t **__ctype_tolower_loc (void)
>     throw () __attribute__ ((__const__));
>extern const __int32_t **__ctype_toupper_loc (void)
>     throw () __attribute__ ((__const__));
># 108 "/usr/include/ctype.h" 3 4
>extern int isalnum (int) throw ();
>extern int isalpha (int) throw ();
>extern int iscntrl (int) throw ();
>extern int isdigit (int) throw ();
>extern int islower (int) throw ();
>extern int isgraph (int) throw ();
>extern int isprint (int) throw ();
>extern int ispunct (int) throw ();
>extern int isspace (int) throw ();
>extern int isupper (int) throw ();
>extern int isxdigit (int) throw ();
>
>
>
>extern int tolower (int __c) throw ();
>
>
>extern int toupper (int __c) throw ();
>
>
>
>
>extern int isblank (int) throw ();
>
>
>
>
>extern int isctype (int __c, int __mask) throw ();
>
>
>
>
>
>
>extern int isascii (int __c) throw ();
>
>
>
>extern int toascii (int __c) throw ();
>
>
>
>extern int _toupper (int) throw ();
>extern int _tolower (int) throw ();
># 251 "/usr/include/ctype.h" 3 4
>extern int isalnum_l (int, locale_t) throw ();
>extern int isalpha_l (int, locale_t) throw ();
>extern int iscntrl_l (int, locale_t) throw ();
>extern int isdigit_l (int, locale_t) throw ();
>extern int islower_l (int, locale_t) throw ();
>extern int isgraph_l (int, locale_t) throw ();
>extern int isprint_l (int, locale_t) throw ();
>extern int ispunct_l (int, locale_t) throw ();
>extern int isspace_l (int, locale_t) throw ();
>extern int isupper_l (int, locale_t) throw ();
>extern int isxdigit_l (int, locale_t) throw ();
>
>extern int isblank_l (int, locale_t) throw ();
>
>
>
>extern int __tolower_l (int __c, locale_t __l) throw ();
>extern int tolower_l (int __c, locale_t __l) throw ();
>
>
>extern int __toupper_l (int __c, locale_t __l) throw ();
>extern int toupper_l (int __c, locale_t __l) throw ();
># 327 "/usr/include/ctype.h" 3 4
>}
># 43 "/usr/include/c++/8/cctype" 2 3
># 62 "/usr/include/c++/8/cctype" 3
>namespace std
>{
>  using ::isalnum;
>  using ::isalpha;
>  using ::iscntrl;
>  using ::isdigit;
>  using ::isgraph;
>  using ::islower;
>  using ::isprint;
>  using ::ispunct;
>  using ::isspace;
>  using ::isupper;
>  using ::isxdigit;
>  using ::tolower;
>  using ::toupper;
>}
>
>
>
>
>
>
>
>namespace std
>{
>  using ::isblank;
>}
># 43 "/usr/include/c++/8/bits/localefwd.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 55 "/usr/include/c++/8/bits/localefwd.h" 3
>  class locale;
>
>  template<typename _Facet>
>    bool
>    has_facet(const locale&) throw();
>
>  template<typename _Facet>
>    const _Facet&
>    use_facet(const locale&);
>
>
>  template<typename _CharT>
>    bool
>    isspace(_CharT, const locale&);
>
>  template<typename _CharT>
>    bool
>    isprint(_CharT, const locale&);
>
>  template<typename _CharT>
>    bool
>    iscntrl(_CharT, const locale&);
>
>  template<typename _CharT>
>    bool
>    isupper(_CharT, const locale&);
>
>  template<typename _CharT>
>    bool
>    islower(_CharT, const locale&);
>
>  template<typename _CharT>
>    bool
>    isalpha(_CharT, const locale&);
>
>  template<typename _CharT>
>    bool
>    isdigit(_CharT, const locale&);
>
>  template<typename _CharT>
>    bool
>    ispunct(_CharT, const locale&);
>
>  template<typename _CharT>
>    bool
>    isxdigit(_CharT, const locale&);
>
>  template<typename _CharT>
>    bool
>    isalnum(_CharT, const locale&);
>
>  template<typename _CharT>
>    bool
>    isgraph(_CharT, const locale&);
>
>
>  template<typename _CharT>
>    bool
>    isblank(_CharT, const locale&);
>
>
>  template<typename _CharT>
>    _CharT
>    toupper(_CharT, const locale&);
>
>  template<typename _CharT>
>    _CharT
>    tolower(_CharT, const locale&);
>
>
>  class ctype_base;
>  template<typename _CharT>
>    class ctype;
>  template<> class ctype<char>;
>
>  template<> class ctype<wchar_t>;
>
>  template<typename _CharT>
>    class ctype_byname;
>
>
>  class codecvt_base;
>  template<typename _InternT, typename _ExternT, typename _StateT>
>    class codecvt;
>  template<> class codecvt<char, char, mbstate_t>;
>
>  template<> class codecvt<wchar_t, char, mbstate_t>;
>
>  template<typename _InternT, typename _ExternT, typename _StateT>
>    class codecvt_byname;
>
>
>
>  template<typename _CharT, typename _InIter = istreambuf_iterator<_CharT> >
>    class num_get;
>  template<typename _CharT, typename _OutIter = ostreambuf_iterator<_CharT> >
>    class num_put;
>
>namespace __cxx11 {
>  template<typename _CharT> class numpunct;
>  template<typename _CharT> class numpunct_byname;
>}
>
>namespace __cxx11 {
>
>  template<typename _CharT>
>    class collate;
>  template<typename _CharT>
>    class collate_byname;
>}
>
>
>  class time_base;
>namespace __cxx11 {
>  template<typename _CharT, typename _InIter = istreambuf_iterator<_CharT> >
>    class time_get;
>  template<typename _CharT, typename _InIter = istreambuf_iterator<_CharT> >
>    class time_get_byname;
>}
>  template<typename _CharT, typename _OutIter = ostreambuf_iterator<_CharT> >
>    class time_put;
>  template<typename _CharT, typename _OutIter = ostreambuf_iterator<_CharT> >
>    class time_put_byname;
>
>
>  class money_base;
>namespace __cxx11 {
>  template<typename _CharT, typename _InIter = istreambuf_iterator<_CharT> >
>    class money_get;
>  template<typename _CharT, typename _OutIter = ostreambuf_iterator<_CharT> >
>    class money_put;
>}
>namespace __cxx11 {
>  template<typename _CharT, bool _Intl = false>
>    class moneypunct;
>  template<typename _CharT, bool _Intl = false>
>    class moneypunct_byname;
>}
>
>
>  class messages_base;
>namespace __cxx11 {
>  template<typename _CharT>
>    class messages;
>  template<typename _CharT>
>    class messages_byname;
>}
>
>
>}
># 42 "/usr/include/c++/8/ios" 2 3
># 1 "/usr/include/c++/8/bits/ios_base.h" 1 3
># 37 "/usr/include/c++/8/bits/ios_base.h" 3
>       
># 38 "/usr/include/c++/8/bits/ios_base.h" 3
>
># 1 "/usr/include/c++/8/ext/atomicity.h" 1 3
># 32 "/usr/include/c++/8/ext/atomicity.h" 3
>       
># 33 "/usr/include/c++/8/ext/atomicity.h" 3
>
>
># 1 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr.h" 1 3
># 30 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr.h" 3
>#pragma GCC visibility push(default)
># 148 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr.h" 3
># 1 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr-default.h" 1 3
># 35 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr-default.h" 3
># 1 "/usr/include/pthread.h" 1 3 4
># 23 "/usr/include/pthread.h" 3 4
># 1 "/usr/include/sched.h" 1 3 4
># 29 "/usr/include/sched.h" 3 4
># 1 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 1 3 4
># 30 "/usr/include/sched.h" 2 3 4
>
># 1 "/usr/include/bits/types/time_t.h" 1 3 4
>
>
>
>
>
>
>typedef __time_t time_t;
># 32 "/usr/include/sched.h" 2 3 4
># 1 "/usr/include/bits/types/struct_timespec.h" 1 3 4
>
>
>
>
>
>
>
>struct timespec
>{
>  __time_t tv_sec;
>  __syscall_slong_t tv_nsec;
>};
># 33 "/usr/include/sched.h" 2 3 4
>
>
>
>
>
>typedef __pid_t pid_t;
>
>
>
>
># 1 "/usr/include/bits/sched.h" 1 3 4
># 74 "/usr/include/bits/sched.h" 3 4
># 1 "/usr/include/bits/types/struct_sched_param.h" 1 3 4
># 23 "/usr/include/bits/types/struct_sched_param.h" 3 4
>struct sched_param
>{
>  int sched_priority;
>};
># 75 "/usr/include/bits/sched.h" 2 3 4
>
>extern "C" {
>
>
>
>extern int clone (int (*__fn) (void *__arg), void *__child_stack,
>    int __flags, void *__arg, ...) throw ();
>
>
>extern int unshare (int __flags) throw ();
>
>
>extern int sched_getcpu (void) throw ();
>
>
>extern int setns (int __fd, int __nstype) throw ();
>
>
>}
># 44 "/usr/include/sched.h" 2 3 4
># 1 "/usr/include/bits/cpu-set.h" 1 3 4
># 32 "/usr/include/bits/cpu-set.h" 3 4
>typedef unsigned long int __cpu_mask;
>
>
>
>
>
>
>typedef struct
>{
>  __cpu_mask __bits[1024 / (8 * sizeof (__cpu_mask))];
>} cpu_set_t;
># 115 "/usr/include/bits/cpu-set.h" 3 4
>extern "C" {
>
>extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
>     throw ();
>extern cpu_set_t *__sched_cpualloc (size_t __count) throw () ;
>extern void __sched_cpufree (cpu_set_t *__set) throw ();
>
>}
># 45 "/usr/include/sched.h" 2 3 4
>
>
>
>
>
>
>extern "C" {
>
>
>extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
>     throw ();
>
>
>extern int sched_getparam (__pid_t __pid, struct sched_param *__param) throw ();
>
>
>extern int sched_setscheduler (__pid_t __pid, int __policy,
>          const struct sched_param *__param) throw ();
>
>
>extern int sched_getscheduler (__pid_t __pid) throw ();
>
>
>extern int sched_yield (void) throw ();
>
>
>extern int sched_get_priority_max (int __algorithm) throw ();
>
>
>extern int sched_get_priority_min (int __algorithm) throw ();
>
>
>extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) throw ();
># 121 "/usr/include/sched.h" 3 4
>extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
>         const cpu_set_t *__cpuset) throw ();
>
>
>extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
>         cpu_set_t *__cpuset) throw ();
>
>
>}
># 24 "/usr/include/pthread.h" 2 3 4
># 1 "/usr/include/time.h" 1 3 4
># 29 "/usr/include/time.h" 3 4
># 1 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 1 3 4
># 30 "/usr/include/time.h" 2 3 4
>
>
>
># 1 "/usr/include/bits/time.h" 1 3 4
># 73 "/usr/include/bits/time.h" 3 4
># 1 "/usr/include/bits/timex.h" 1 3 4
># 22 "/usr/include/bits/timex.h" 3 4
># 1 "/usr/include/bits/types/struct_timeval.h" 1 3 4
>
>
>
>
>
>
>
>struct timeval
>{
>  __time_t tv_sec;
>  __suseconds_t tv_usec;
>};
># 23 "/usr/include/bits/timex.h" 2 3 4
>
>
>
>struct timex
>{
>  unsigned int modes;
>  __syscall_slong_t offset;
>  __syscall_slong_t freq;
>  __syscall_slong_t maxerror;
>  __syscall_slong_t esterror;
>  int status;
>  __syscall_slong_t constant;
>  __syscall_slong_t precision;
>  __syscall_slong_t tolerance;
>  struct timeval time;
>  __syscall_slong_t tick;
>  __syscall_slong_t ppsfreq;
>  __syscall_slong_t jitter;
>  int shift;
>  __syscall_slong_t stabil;
>  __syscall_slong_t jitcnt;
>  __syscall_slong_t calcnt;
>  __syscall_slong_t errcnt;
>  __syscall_slong_t stbcnt;
>
>  int tai;
>
>
>  int :32; int :32; int :32; int :32;
>  int :32; int :32; int :32; int :32;
>  int :32; int :32; int :32;
>};
># 74 "/usr/include/bits/time.h" 2 3 4
>
>extern "C" {
>
>
>extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx) throw ();
>
>}
># 34 "/usr/include/time.h" 2 3 4
>
>
>
># 1 "/usr/include/bits/types/clock_t.h" 1 3 4
>
>
>
>
>
>
>typedef __clock_t clock_t;
># 38 "/usr/include/time.h" 2 3 4
>
># 1 "/usr/include/bits/types/struct_tm.h" 1 3 4
>
>
>
>
>
>
>struct tm
>{
>  int tm_sec;
>  int tm_min;
>  int tm_hour;
>  int tm_mday;
>  int tm_mon;
>  int tm_year;
>  int tm_wday;
>  int tm_yday;
>  int tm_isdst;
>
>
>  long int tm_gmtoff;
>  const char *tm_zone;
>
>
>
>
>};
># 40 "/usr/include/time.h" 2 3 4
>
>
>
>
>
>
># 1 "/usr/include/bits/types/clockid_t.h" 1 3 4
>
>
>
>
>
>
>typedef __clockid_t clockid_t;
># 47 "/usr/include/time.h" 2 3 4
># 1 "/usr/include/bits/types/timer_t.h" 1 3 4
>
>
>
>
>
>
>typedef __timer_t timer_t;
># 48 "/usr/include/time.h" 2 3 4
># 1 "/usr/include/bits/types/struct_itimerspec.h" 1 3 4
>
>
>
>
>
>
>
>struct itimerspec
>  {
>    struct timespec it_interval;
>    struct timespec it_value;
>  };
># 49 "/usr/include/time.h" 2 3 4
>struct sigevent;
># 68 "/usr/include/time.h" 3 4
>extern "C" {
>
>
>
>extern clock_t clock (void) throw ();
>
>
>extern time_t time (time_t *__timer) throw ();
>
>
>extern double difftime (time_t __time1, time_t __time0)
>     throw () __attribute__ ((__const__));
>
>
>extern time_t mktime (struct tm *__tp) throw ();
>
>
>
>
>
>extern size_t strftime (char *__restrict __s, size_t __maxsize,
>   const char *__restrict __format,
>   const struct tm *__restrict __tp) throw ();
>
>
>
>
>extern char *strptime (const char *__restrict __s,
>         const char *__restrict __fmt, struct tm *__tp)
>     throw ();
>
>
>
>
>
>
>extern size_t strftime_l (char *__restrict __s, size_t __maxsize,
>     const char *__restrict __format,
>     const struct tm *__restrict __tp,
>     locale_t __loc) throw ();
>
>
>
>extern char *strptime_l (const char *__restrict __s,
>    const char *__restrict __fmt, struct tm *__tp,
>    locale_t __loc) throw ();
>
>
>
>
>
>extern struct tm *gmtime (const time_t *__timer) throw ();
>
>
>
>extern struct tm *localtime (const time_t *__timer) throw ();
>
>
>
>
>extern struct tm *gmtime_r (const time_t *__restrict __timer,
>       struct tm *__restrict __tp) throw ();
>
>
>
>extern struct tm *localtime_r (const time_t *__restrict __timer,
>          struct tm *__restrict __tp) throw ();
>
>
>
>
>extern char *asctime (const struct tm *__tp) throw ();
>
>
>extern char *ctime (const time_t *__timer) throw ();
>
>
>
>
>
>
>extern char *asctime_r (const struct tm *__restrict __tp,
>   char *__restrict __buf) throw ();
>
>
>extern char *ctime_r (const time_t *__restrict __timer,
>        char *__restrict __buf) throw ();
>
>
>
>
>extern char *__tzname[2];
>extern int __daylight;
>extern long int __timezone;
>
>
>
>
>extern char *tzname[2];
>
>
>
>extern void tzset (void) throw ();
>
>
>
>extern int daylight;
>extern long int timezone;
>
>
>
>
>
>extern int stime (const time_t *__when) throw ();
># 196 "/usr/include/time.h" 3 4
>extern time_t timegm (struct tm *__tp) throw ();
>
>
>extern time_t timelocal (struct tm *__tp) throw ();
>
>
>extern int dysize (int __year) throw () __attribute__ ((__const__));
># 211 "/usr/include/time.h" 3 4
>extern int nanosleep (const struct timespec *__requested_time,
>        struct timespec *__remaining);
>
>
>
>extern int clock_getres (clockid_t __clock_id, struct timespec *__res) throw ();
>
>
>extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) throw ();
>
>
>extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp)
>     throw ();
>
>
>
>
>
>
>extern int clock_nanosleep (clockid_t __clock_id, int __flags,
>       const struct timespec *__req,
>       struct timespec *__rem);
>
>
>extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) throw ();
>
>
>
>
>extern int timer_create (clockid_t __clock_id,
>    struct sigevent *__restrict __evp,
>    timer_t *__restrict __timerid) throw ();
>
>
>extern int timer_delete (timer_t __timerid) throw ();
>
>
>extern int timer_settime (timer_t __timerid, int __flags,
>     const struct itimerspec *__restrict __value,
>     struct itimerspec *__restrict __ovalue) throw ();
>
>
>extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
>     throw ();
>
>
>extern int timer_getoverrun (timer_t __timerid) throw ();
>
>
>
>
>
>extern int timespec_get (struct timespec *__ts, int __base)
>     throw () __attribute__ ((__nonnull__ (1)));
># 280 "/usr/include/time.h" 3 4
>extern int getdate_err;
># 289 "/usr/include/time.h" 3 4
>extern struct tm *getdate (const char *__string);
># 303 "/usr/include/time.h" 3 4
>extern int getdate_r (const char *__restrict __string,
>        struct tm *__restrict __resbufp);
>
>
>}
># 25 "/usr/include/pthread.h" 2 3 4
>
># 1 "/usr/include/bits/pthreadtypes.h" 1 3 4
># 23 "/usr/include/bits/pthreadtypes.h" 3 4
># 1 "/usr/include/bits/thread-shared-types.h" 1 3 4
># 77 "/usr/include/bits/thread-shared-types.h" 3 4
># 1 "/usr/include/bits/pthreadtypes-arch.h" 1 3 4
># 21 "/usr/include/bits/pthreadtypes-arch.h" 3 4
># 1 "/usr/include/bits/wordsize.h" 1 3 4
># 22 "/usr/include/bits/pthreadtypes-arch.h" 2 3 4
># 65 "/usr/include/bits/pthreadtypes-arch.h" 3 4
>struct __pthread_rwlock_arch_t
>{
>  unsigned int __readers;
>  unsigned int __writers;
>  unsigned int __wrphase_futex;
>  unsigned int __writers_futex;
>  unsigned int __pad3;
>  unsigned int __pad4;
>
>  int __cur_writer;
>  int __shared;
>  signed char __rwelision;
>
>
>
>
>  unsigned char __pad1[7];
>
>
>  unsigned long int __pad2;
>
>
>  unsigned int __flags;
># 99 "/usr/include/bits/pthreadtypes-arch.h" 3 4
>};
># 78 "/usr/include/bits/thread-shared-types.h" 2 3 4
>
>
>
>
>typedef struct __pthread_internal_list
>{
>  struct __pthread_internal_list *__prev;
>  struct __pthread_internal_list *__next;
>} __pthread_list_t;
># 118 "/usr/include/bits/thread-shared-types.h" 3 4
>struct __pthread_mutex_s
>{
>  int __lock ;
>  unsigned int __count;
>  int __owner;
>
>  unsigned int __nusers;
>
>
>
>  int __kind;
> 
>
>
>
>
>  short __spins; short __elision;
>  __pthread_list_t __list;
># 145 "/usr/include/bits/thread-shared-types.h" 3 4
> 
>};
>
>
>
>
>struct __pthread_cond_s
>{
>  __extension__ union
>  {
>    __extension__ unsigned long long int __wseq;
>    struct
>    {
>      unsigned int __low;
>      unsigned int __high;
>    } __wseq32;
>  };
>  __extension__ union
>  {
>    __extension__ unsigned long long int __g1_start;
>    struct
>    {
>      unsigned int __low;
>      unsigned int __high;
>    } __g1_start32;
>  };
>  unsigned int __g_refs[2] ;
>  unsigned int __g_size[2];
>  unsigned int __g1_orig_size;
>  unsigned int __wrefs;
>  unsigned int __g_signals[2];
>};
># 24 "/usr/include/bits/pthreadtypes.h" 2 3 4
>
>
>
>typedef unsigned long int pthread_t;
>
>
>
>
>typedef union
>{
>  char __size[4];
>  int __align;
>} pthread_mutexattr_t;
>
>
>
>
>typedef union
>{
>  char __size[4];
>  int __align;
>} pthread_condattr_t;
>
>
>
>typedef unsigned int pthread_key_t;
>
>
>
>typedef int pthread_once_t;
>
>
>union pthread_attr_t
>{
>  char __size[56];
>  long int __align;
>};
>
>typedef union pthread_attr_t pthread_attr_t;
>
>
>
>
>typedef union
>{
>  struct __pthread_mutex_s __data;
>  char __size[40];
>  long int __align;
>} pthread_mutex_t;
>
>
>typedef union
>{
>  struct __pthread_cond_s __data;
>  char __size[48];
>  __extension__ long long int __align;
>} pthread_cond_t;
>
>
>
>
>
>typedef union
>{
>  struct __pthread_rwlock_arch_t __data;
>  char __size[56];
>  long int __align;
>} pthread_rwlock_t;
>
>typedef union
>{
>  char __size[8];
>  long int __align;
>} pthread_rwlockattr_t;
>
>
>
>
>
>typedef volatile int pthread_spinlock_t;
>
>
>
>
>typedef union
>{
>  char __size[32];
>  long int __align;
>} pthread_barrier_t;
>
>typedef union
>{
>  char __size[4];
>  int __align;
>} pthread_barrierattr_t;
># 27 "/usr/include/pthread.h" 2 3 4
># 1 "/usr/include/bits/setjmp.h" 1 3 4
># 26 "/usr/include/bits/setjmp.h" 3 4
># 1 "/usr/include/bits/wordsize.h" 1 3 4
># 27 "/usr/include/bits/setjmp.h" 2 3 4
>
>
>
>
>typedef long int __jmp_buf[8];
># 28 "/usr/include/pthread.h" 2 3 4
># 1 "/usr/include/bits/wordsize.h" 1 3 4
># 29 "/usr/include/pthread.h" 2 3 4
>
>
>
>
>enum
>{
>  PTHREAD_CREATE_JOINABLE,
>
>  PTHREAD_CREATE_DETACHED
>
>};
>
>
>
>enum
>{
>  PTHREAD_MUTEX_TIMED_NP,
>  PTHREAD_MUTEX_RECURSIVE_NP,
>  PTHREAD_MUTEX_ERRORCHECK_NP,
>  PTHREAD_MUTEX_ADAPTIVE_NP
>
>  ,
>  PTHREAD_MUTEX_NORMAL = PTHREAD_MUTEX_TIMED_NP,
>  PTHREAD_MUTEX_RECURSIVE = PTHREAD_MUTEX_RECURSIVE_NP,
>  PTHREAD_MUTEX_ERRORCHECK = PTHREAD_MUTEX_ERRORCHECK_NP,
>  PTHREAD_MUTEX_DEFAULT = PTHREAD_MUTEX_NORMAL
>
>
>
>  , PTHREAD_MUTEX_FAST_NP = PTHREAD_MUTEX_TIMED_NP
>
>};
>
>
>
>
>enum
>{
>  PTHREAD_MUTEX_STALLED,
>  PTHREAD_MUTEX_STALLED_NP = PTHREAD_MUTEX_STALLED,
>  PTHREAD_MUTEX_ROBUST,
>  PTHREAD_MUTEX_ROBUST_NP = PTHREAD_MUTEX_ROBUST
>};
>
>
>
>
>
>enum
>{
>  PTHREAD_PRIO_NONE,
>  PTHREAD_PRIO_INHERIT,
>  PTHREAD_PRIO_PROTECT
>};
># 115 "/usr/include/pthread.h" 3 4
>enum
>{
>  PTHREAD_RWLOCK_PREFER_READER_NP,
>  PTHREAD_RWLOCK_PREFER_WRITER_NP,
>  PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP,
>  PTHREAD_RWLOCK_DEFAULT_NP = PTHREAD_RWLOCK_PREFER_READER_NP
>};
># 156 "/usr/include/pthread.h" 3 4
>enum
>{
>  PTHREAD_INHERIT_SCHED,
>
>  PTHREAD_EXPLICIT_SCHED
>
>};
>
>
>
>enum
>{
>  PTHREAD_SCOPE_SYSTEM,
>
>  PTHREAD_SCOPE_PROCESS
>
>};
>
>
>
>enum
>{
>  PTHREAD_PROCESS_PRIVATE,
>
>  PTHREAD_PROCESS_SHARED
>
>};
># 191 "/usr/include/pthread.h" 3 4
>struct _pthread_cleanup_buffer
>{
>  void (*__routine) (void *);
>  void *__arg;
>  int __canceltype;
>  struct _pthread_cleanup_buffer *__prev;
>};
>
>
>enum
>{
>  PTHREAD_CANCEL_ENABLE,
>
>  PTHREAD_CANCEL_DISABLE
>
>};
>enum
>{
>  PTHREAD_CANCEL_DEFERRED,
>
>  PTHREAD_CANCEL_ASYNCHRONOUS
>
>};
># 229 "/usr/include/pthread.h" 3 4
>extern "C" {
>
>
>
>
>extern int pthread_create (pthread_t *__restrict __newthread,
>      const pthread_attr_t *__restrict __attr,
>      void *(*__start_routine) (void *),
>      void *__restrict __arg) throw () __attribute__ ((__nonnull__ (1, 3)));
>
>
>
>
>
>extern void pthread_exit (void *__retval) __attribute__ ((__noreturn__));
>
>
>
>
>
>
>
>extern int pthread_join (pthread_t __th, void **__thread_return);
>
>
>
>
>extern int pthread_tryjoin_np (pthread_t __th, void **__thread_return) throw ();
>
>
>
>
>
>
>
>extern int pthread_timedjoin_np (pthread_t __th, void **__thread_return,
>     const struct timespec *__abstime);
>
>
>
>
>
>
>extern int pthread_detach (pthread_t __th) throw ();
>
>
>
>extern pthread_t pthread_self (void) throw () __attribute__ ((__const__));
>
>
>extern int pthread_equal (pthread_t __thread1, pthread_t __thread2)
>  throw () __attribute__ ((__const__));
>
>
>
>
>
>
>
>extern int pthread_attr_init (pthread_attr_t *__attr) throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_attr_destroy (pthread_attr_t *__attr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_attr_getdetachstate (const pthread_attr_t *__attr,
>     int *__detachstate)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_attr_setdetachstate (pthread_attr_t *__attr,
>     int __detachstate)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_attr_getguardsize (const pthread_attr_t *__attr,
>          size_t *__guardsize)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_attr_setguardsize (pthread_attr_t *__attr,
>          size_t __guardsize)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_attr_getschedparam (const pthread_attr_t *__restrict __attr,
>           struct sched_param *__restrict __param)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_attr_setschedparam (pthread_attr_t *__restrict __attr,
>           const struct sched_param *__restrict
>           __param) throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_attr_getschedpolicy (const pthread_attr_t *__restrict
>     __attr, int *__restrict __policy)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_attr_setschedpolicy (pthread_attr_t *__attr, int __policy)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_attr_getinheritsched (const pthread_attr_t *__restrict
>      __attr, int *__restrict __inherit)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_attr_setinheritsched (pthread_attr_t *__attr,
>      int __inherit)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_attr_getscope (const pthread_attr_t *__restrict __attr,
>      int *__restrict __scope)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_attr_setscope (pthread_attr_t *__attr, int __scope)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_attr_getstackaddr (const pthread_attr_t *__restrict
>          __attr, void **__restrict __stackaddr)
>     throw () __attribute__ ((__nonnull__ (1, 2))) __attribute__ ((__deprecated__));
>
>
>
>
>
>extern int pthread_attr_setstackaddr (pthread_attr_t *__attr,
>          void *__stackaddr)
>     throw () __attribute__ ((__nonnull__ (1))) __attribute__ ((__deprecated__));
>
>
>extern int pthread_attr_getstacksize (const pthread_attr_t *__restrict
>          __attr, size_t *__restrict __stacksize)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>
>
>extern int pthread_attr_setstacksize (pthread_attr_t *__attr,
>          size_t __stacksize)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_attr_getstack (const pthread_attr_t *__restrict __attr,
>      void **__restrict __stackaddr,
>      size_t *__restrict __stacksize)
>     throw () __attribute__ ((__nonnull__ (1, 2, 3)));
>
>
>
>
>extern int pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
>      size_t __stacksize) throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>
>extern int pthread_attr_setaffinity_np (pthread_attr_t *__attr,
>     size_t __cpusetsize,
>     const cpu_set_t *__cpuset)
>     throw () __attribute__ ((__nonnull__ (1, 3)));
>
>
>
>extern int pthread_attr_getaffinity_np (const pthread_attr_t *__attr,
>     size_t __cpusetsize,
>     cpu_set_t *__cpuset)
>     throw () __attribute__ ((__nonnull__ (1, 3)));
>
>
>extern int pthread_getattr_default_np (pthread_attr_t *__attr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_setattr_default_np (const pthread_attr_t *__attr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>extern int pthread_getattr_np (pthread_t __th, pthread_attr_t *__attr)
>     throw () __attribute__ ((__nonnull__ (2)));
>
>
>
>
>
>
>
>extern int pthread_setschedparam (pthread_t __target_thread, int __policy,
>      const struct sched_param *__param)
>     throw () __attribute__ ((__nonnull__ (3)));
>
>
>extern int pthread_getschedparam (pthread_t __target_thread,
>      int *__restrict __policy,
>      struct sched_param *__restrict __param)
>     throw () __attribute__ ((__nonnull__ (2, 3)));
>
>
>extern int pthread_setschedprio (pthread_t __target_thread, int __prio)
>     throw ();
>
>
>
>
>extern int pthread_getname_np (pthread_t __target_thread, char *__buf,
>          size_t __buflen)
>     throw () __attribute__ ((__nonnull__ (2)));
>
>
>extern int pthread_setname_np (pthread_t __target_thread, const char *__name)
>     throw () __attribute__ ((__nonnull__ (2)));
>
>
>
>
>
>extern int pthread_getconcurrency (void) throw ();
>
>
>extern int pthread_setconcurrency (int __level) throw ();
>
>
>
>
>
>
>
>extern int pthread_yield (void) throw ();
>
>
>
>
>extern int pthread_setaffinity_np (pthread_t __th, size_t __cpusetsize,
>       const cpu_set_t *__cpuset)
>     throw () __attribute__ ((__nonnull__ (3)));
>
>
>extern int pthread_getaffinity_np (pthread_t __th, size_t __cpusetsize,
>       cpu_set_t *__cpuset)
>     throw () __attribute__ ((__nonnull__ (3)));
># 495 "/usr/include/pthread.h" 3 4
>extern int pthread_once (pthread_once_t *__once_control,
>    void (*__init_routine) (void)) __attribute__ ((__nonnull__ (1, 2)));
># 507 "/usr/include/pthread.h" 3 4
>extern int pthread_setcancelstate (int __state, int *__oldstate);
>
>
>
>extern int pthread_setcanceltype (int __type, int *__oldtype);
>
>
>extern int pthread_cancel (pthread_t __th);
>
>
>
>
>extern void pthread_testcancel (void);
>
>
>
>
>typedef struct
>{
>  struct
>  {
>    __jmp_buf __cancel_jmp_buf;
>    int __mask_was_saved;
>  } __cancel_jmp_buf[1];
>  void *__pad[4];
>} __pthread_unwind_buf_t __attribute__ ((__aligned__));
># 541 "/usr/include/pthread.h" 3 4
>struct __pthread_cleanup_frame
>{
>  void (*__cancel_routine) (void *);
>  void *__cancel_arg;
>  int __do_it;
>  int __cancel_type;
>};
>
>
>
>
>class __pthread_cleanup_class
>{
>  void (*__cancel_routine) (void *);
>  void *__cancel_arg;
>  int __do_it;
>  int __cancel_type;
>
> public:
>  __pthread_cleanup_class (void (*__fct) (void *), void *__arg)
>    : __cancel_routine (__fct), __cancel_arg (__arg), __do_it (1) { }
>  ~__pthread_cleanup_class () { if (__do_it) __cancel_routine (__cancel_arg); }
>  void __setdoit (int __newval) { __do_it = __newval; }
>  void __defer () { pthread_setcanceltype (PTHREAD_CANCEL_DEFERRED,
>        &__cancel_type); }
>  void __restore () const { pthread_setcanceltype (__cancel_type, 0); }
>};
># 743 "/usr/include/pthread.h" 3 4
>struct __jmp_buf_tag;
>extern int __sigsetjmp (struct __jmp_buf_tag *__env, int __savemask) throw ();
>
>
>
>
>
>extern int pthread_mutex_init (pthread_mutex_t *__mutex,
>          const pthread_mutexattr_t *__mutexattr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_mutex_destroy (pthread_mutex_t *__mutex)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_mutex_trylock (pthread_mutex_t *__mutex)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_mutex_lock (pthread_mutex_t *__mutex)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_mutex_timedlock (pthread_mutex_t *__restrict __mutex,
>        const struct timespec *__restrict
>        __abstime) throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>
>extern int pthread_mutex_unlock (pthread_mutex_t *__mutex)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_mutex_getprioceiling (const pthread_mutex_t *
>      __restrict __mutex,
>      int *__restrict __prioceiling)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>
>extern int pthread_mutex_setprioceiling (pthread_mutex_t *__restrict __mutex,
>      int __prioceiling,
>      int *__restrict __old_ceiling)
>     throw () __attribute__ ((__nonnull__ (1, 3)));
>
>
>
>
>extern int pthread_mutex_consistent (pthread_mutex_t *__mutex)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>extern int pthread_mutex_consistent_np (pthread_mutex_t *__mutex)
>     throw () __attribute__ ((__nonnull__ (1)));
># 807 "/usr/include/pthread.h" 3 4
>extern int pthread_mutexattr_init (pthread_mutexattr_t *__attr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_mutexattr_destroy (pthread_mutexattr_t *__attr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_mutexattr_getpshared (const pthread_mutexattr_t *
>      __restrict __attr,
>      int *__restrict __pshared)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_mutexattr_setpshared (pthread_mutexattr_t *__attr,
>      int __pshared)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_mutexattr_gettype (const pthread_mutexattr_t *__restrict
>          __attr, int *__restrict __kind)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>
>
>extern int pthread_mutexattr_settype (pthread_mutexattr_t *__attr, int __kind)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_mutexattr_getprotocol (const pthread_mutexattr_t *
>       __restrict __attr,
>       int *__restrict __protocol)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>
>extern int pthread_mutexattr_setprotocol (pthread_mutexattr_t *__attr,
>       int __protocol)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_mutexattr_getprioceiling (const pthread_mutexattr_t *
>          __restrict __attr,
>          int *__restrict __prioceiling)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_mutexattr_setprioceiling (pthread_mutexattr_t *__attr,
>          int __prioceiling)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_mutexattr_getrobust (const pthread_mutexattr_t *__attr,
>     int *__robustness)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>extern int pthread_mutexattr_getrobust_np (const pthread_mutexattr_t *__attr,
>        int *__robustness)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>
>extern int pthread_mutexattr_setrobust (pthread_mutexattr_t *__attr,
>     int __robustness)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>extern int pthread_mutexattr_setrobust_np (pthread_mutexattr_t *__attr,
>        int __robustness)
>     throw () __attribute__ ((__nonnull__ (1)));
># 889 "/usr/include/pthread.h" 3 4
>extern int pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock,
>    const pthread_rwlockattr_t *__restrict
>    __attr) throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_rwlock_destroy (pthread_rwlock_t *__rwlock)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock)
>  throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_rwlock_timedrdlock (pthread_rwlock_t *__restrict __rwlock,
>           const struct timespec *__restrict
>           __abstime) throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>
>extern int pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_rwlock_timedwrlock (pthread_rwlock_t *__restrict __rwlock,
>           const struct timespec *__restrict
>           __abstime) throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>
>extern int pthread_rwlock_unlock (pthread_rwlock_t *__rwlock)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>
>extern int pthread_rwlockattr_init (pthread_rwlockattr_t *__attr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_rwlockattr_destroy (pthread_rwlockattr_t *__attr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_rwlockattr_getpshared (const pthread_rwlockattr_t *
>       __restrict __attr,
>       int *__restrict __pshared)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_rwlockattr_setpshared (pthread_rwlockattr_t *__attr,
>       int __pshared)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_rwlockattr_getkind_np (const pthread_rwlockattr_t *
>       __restrict __attr,
>       int *__restrict __pref)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_rwlockattr_setkind_np (pthread_rwlockattr_t *__attr,
>       int __pref) throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>
>
>
>extern int pthread_cond_init (pthread_cond_t *__restrict __cond,
>         const pthread_condattr_t *__restrict __cond_attr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_cond_destroy (pthread_cond_t *__cond)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_cond_signal (pthread_cond_t *__cond)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_cond_broadcast (pthread_cond_t *__cond)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>
>
>extern int pthread_cond_wait (pthread_cond_t *__restrict __cond,
>         pthread_mutex_t *__restrict __mutex)
>     __attribute__ ((__nonnull__ (1, 2)));
># 1001 "/usr/include/pthread.h" 3 4
>extern int pthread_cond_timedwait (pthread_cond_t *__restrict __cond,
>       pthread_mutex_t *__restrict __mutex,
>       const struct timespec *__restrict __abstime)
>     __attribute__ ((__nonnull__ (1, 2, 3)));
>
>
>
>
>extern int pthread_condattr_init (pthread_condattr_t *__attr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_condattr_destroy (pthread_condattr_t *__attr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_condattr_getpshared (const pthread_condattr_t *
>     __restrict __attr,
>     int *__restrict __pshared)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_condattr_setpshared (pthread_condattr_t *__attr,
>     int __pshared) throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_condattr_getclock (const pthread_condattr_t *
>          __restrict __attr,
>          __clockid_t *__restrict __clock_id)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_condattr_setclock (pthread_condattr_t *__attr,
>          __clockid_t __clock_id)
>     throw () __attribute__ ((__nonnull__ (1)));
># 1045 "/usr/include/pthread.h" 3 4
>extern int pthread_spin_init (pthread_spinlock_t *__lock, int __pshared)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_spin_destroy (pthread_spinlock_t *__lock)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_spin_lock (pthread_spinlock_t *__lock)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_spin_trylock (pthread_spinlock_t *__lock)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_spin_unlock (pthread_spinlock_t *__lock)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>
>
>extern int pthread_barrier_init (pthread_barrier_t *__restrict __barrier,
>     const pthread_barrierattr_t *__restrict
>     __attr, unsigned int __count)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_barrier_destroy (pthread_barrier_t *__barrier)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_barrier_wait (pthread_barrier_t *__barrier)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern int pthread_barrierattr_init (pthread_barrierattr_t *__attr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_barrierattr_destroy (pthread_barrierattr_t *__attr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_barrierattr_getpshared (const pthread_barrierattr_t *
>        __restrict __attr,
>        int *__restrict __pshared)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int pthread_barrierattr_setpshared (pthread_barrierattr_t *__attr,
>        int __pshared)
>     throw () __attribute__ ((__nonnull__ (1)));
># 1112 "/usr/include/pthread.h" 3 4
>extern int pthread_key_create (pthread_key_t *__key,
>          void (*__destr_function) (void *))
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern int pthread_key_delete (pthread_key_t __key) throw ();
>
>
>extern void *pthread_getspecific (pthread_key_t __key) throw ();
>
>
>extern int pthread_setspecific (pthread_key_t __key,
>    const void *__pointer) throw () ;
>
>
>
>
>extern int pthread_getcpuclockid (pthread_t __thread_id,
>      __clockid_t *__clock_id)
>     throw () __attribute__ ((__nonnull__ (2)));
># 1146 "/usr/include/pthread.h" 3 4
>extern int pthread_atfork (void (*__prepare) (void),
>      void (*__parent) (void),
>      void (*__child) (void)) throw ();
># 1160 "/usr/include/pthread.h" 3 4
>}
># 36 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr-default.h" 2 3
># 47 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr-default.h" 3
>typedef pthread_t __gthread_t;
>typedef pthread_key_t __gthread_key_t;
>typedef pthread_once_t __gthread_once_t;
>typedef pthread_mutex_t __gthread_mutex_t;
>typedef pthread_mutex_t __gthread_recursive_mutex_t;
>typedef pthread_cond_t __gthread_cond_t;
>typedef struct timespec __gthread_time_t;
># 101 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr-default.h" 3
>static __typeof(pthread_once) __gthrw_pthread_once __attribute__ ((__weakref__("pthread_once")));
>static __typeof(pthread_getspecific) __gthrw_pthread_getspecific __attribute__ ((__weakref__("pthread_getspecific")));
>static __typeof(pthread_setspecific) __gthrw_pthread_setspecific __attribute__ ((__weakref__("pthread_setspecific")));
>
>static __typeof(pthread_create) __gthrw_pthread_create __attribute__ ((__weakref__("pthread_create")));
>static __typeof(pthread_join) __gthrw_pthread_join __attribute__ ((__weakref__("pthread_join")));
>static __typeof(pthread_equal) __gthrw_pthread_equal __attribute__ ((__weakref__("pthread_equal")));
>static __typeof(pthread_self) __gthrw_pthread_self __attribute__ ((__weakref__("pthread_self")));
>static __typeof(pthread_detach) __gthrw_pthread_detach __attribute__ ((__weakref__("pthread_detach")));
>
>static __typeof(pthread_cancel) __gthrw_pthread_cancel __attribute__ ((__weakref__("pthread_cancel")));
>
>static __typeof(sched_yield) __gthrw_sched_yield __attribute__ ((__weakref__("sched_yield")));
>
>static __typeof(pthread_mutex_lock) __gthrw_pthread_mutex_lock __attribute__ ((__weakref__("pthread_mutex_lock")));
>static __typeof(pthread_mutex_trylock) __gthrw_pthread_mutex_trylock __attribute__ ((__weakref__("pthread_mutex_trylock")));
>
>static __typeof(pthread_mutex_timedlock) __gthrw_pthread_mutex_timedlock __attribute__ ((__weakref__("pthread_mutex_timedlock")));
>
>static __typeof(pthread_mutex_unlock) __gthrw_pthread_mutex_unlock __attribute__ ((__weakref__("pthread_mutex_unlock")));
>static __typeof(pthread_mutex_init) __gthrw_pthread_mutex_init __attribute__ ((__weakref__("pthread_mutex_init")));
>static __typeof(pthread_mutex_destroy) __gthrw_pthread_mutex_destroy __attribute__ ((__weakref__("pthread_mutex_destroy")));
>
>static __typeof(pthread_cond_init) __gthrw_pthread_cond_init __attribute__ ((__weakref__("pthread_cond_init")));
>static __typeof(pthread_cond_broadcast) __gthrw_pthread_cond_broadcast __attribute__ ((__weakref__("pthread_cond_broadcast")));
>static __typeof(pthread_cond_signal) __gthrw_pthread_cond_signal __attribute__ ((__weakref__("pthread_cond_signal")));
>static __typeof(pthread_cond_wait) __gthrw_pthread_cond_wait __attribute__ ((__weakref__("pthread_cond_wait")));
>static __typeof(pthread_cond_timedwait) __gthrw_pthread_cond_timedwait __attribute__ ((__weakref__("pthread_cond_timedwait")));
>static __typeof(pthread_cond_destroy) __gthrw_pthread_cond_destroy __attribute__ ((__weakref__("pthread_cond_destroy")));
>
>static __typeof(pthread_key_create) __gthrw_pthread_key_create __attribute__ ((__weakref__("pthread_key_create")));
>static __typeof(pthread_key_delete) __gthrw_pthread_key_delete __attribute__ ((__weakref__("pthread_key_delete")));
>static __typeof(pthread_mutexattr_init) __gthrw_pthread_mutexattr_init __attribute__ ((__weakref__("pthread_mutexattr_init")));
>static __typeof(pthread_mutexattr_settype) __gthrw_pthread_mutexattr_settype __attribute__ ((__weakref__("pthread_mutexattr_settype")));
>static __typeof(pthread_mutexattr_destroy) __gthrw_pthread_mutexattr_destroy __attribute__ ((__weakref__("pthread_mutexattr_destroy")));
># 236 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr-default.h" 3
>static __typeof(pthread_key_create) __gthrw___pthread_key_create __attribute__ ((__weakref__("__pthread_key_create")));
># 246 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr-default.h" 3
>static inline int
>__gthread_active_p (void)
>{
>  static void *const __gthread_active_ptr
>    = __extension__ (void *) &__gthrw___pthread_key_create;
>  return __gthread_active_ptr != 0;
>}
># 658 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr-default.h" 3
>static inline int
>__gthread_create (__gthread_t *__threadid, void *(*__func) (void*),
>    void *__args)
>{
>  return __gthrw_pthread_create (__threadid, __null, __func, __args);
>}
>
>static inline int
>__gthread_join (__gthread_t __threadid, void **__value_ptr)
>{
>  return __gthrw_pthread_join (__threadid, __value_ptr);
>}
>
>static inline int
>__gthread_detach (__gthread_t __threadid)
>{
>  return __gthrw_pthread_detach (__threadid);
>}
>
>static inline int
>__gthread_equal (__gthread_t __t1, __gthread_t __t2)
>{
>  return __gthrw_pthread_equal (__t1, __t2);
>}
>
>static inline __gthread_t
>__gthread_self (void)
>{
>  return __gthrw_pthread_self ();
>}
>
>static inline int
>__gthread_yield (void)
>{
>  return __gthrw_sched_yield ();
>}
>
>static inline int
>__gthread_once (__gthread_once_t *__once, void (*__func) (void))
>{
>  if (__gthread_active_p ())
>    return __gthrw_pthread_once (__once, __func);
>  else
>    return -1;
>}
>
>static inline int
>__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
>{
>  return __gthrw_pthread_key_create (__key, __dtor);
>}
>
>static inline int
>__gthread_key_delete (__gthread_key_t __key)
>{
>  return __gthrw_pthread_key_delete (__key);
>}
>
>static inline void *
>__gthread_getspecific (__gthread_key_t __key)
>{
>  return __gthrw_pthread_getspecific (__key);
>}
>
>static inline int
>__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
>{
>  return __gthrw_pthread_setspecific (__key, __ptr);
>}
>
>static inline void
>__gthread_mutex_init_function (__gthread_mutex_t *__mutex)
>{
>  if (__gthread_active_p ())
>    __gthrw_pthread_mutex_init (__mutex, __null);
>}
>
>static inline int
>__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
>{
>  if (__gthread_active_p ())
>    return __gthrw_pthread_mutex_destroy (__mutex);
>  else
>    return 0;
>}
>
>static inline int
>__gthread_mutex_lock (__gthread_mutex_t *__mutex)
>{
>  if (__gthread_active_p ())
>    return __gthrw_pthread_mutex_lock (__mutex);
>  else
>    return 0;
>}
>
>static inline int
>__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
>{
>  if (__gthread_active_p ())
>    return __gthrw_pthread_mutex_trylock (__mutex);
>  else
>    return 0;
>}
>
>
>static inline int
>__gthread_mutex_timedlock (__gthread_mutex_t *__mutex,
>      const __gthread_time_t *__abs_timeout)
>{
>  if (__gthread_active_p ())
>    return __gthrw_pthread_mutex_timedlock (__mutex, __abs_timeout);
>  else
>    return 0;
>}
>
>
>static inline int
>__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
>{
>  if (__gthread_active_p ())
>    return __gthrw_pthread_mutex_unlock (__mutex);
>  else
>    return 0;
>}
># 807 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr-default.h" 3
>static inline int
>__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
>{
>  return __gthread_mutex_lock (__mutex);
>}
>
>static inline int
>__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
>{
>  return __gthread_mutex_trylock (__mutex);
>}
>
>
>static inline int
>__gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *__mutex,
>         const __gthread_time_t *__abs_timeout)
>{
>  return __gthread_mutex_timedlock (__mutex, __abs_timeout);
>}
>
>
>static inline int
>__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
>{
>  return __gthread_mutex_unlock (__mutex);
>}
>
>static inline int
>__gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex)
>{
>  return __gthread_mutex_destroy (__mutex);
>}
># 849 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr-default.h" 3
>static inline int
>__gthread_cond_broadcast (__gthread_cond_t *__cond)
>{
>  return __gthrw_pthread_cond_broadcast (__cond);
>}
>
>static inline int
>__gthread_cond_signal (__gthread_cond_t *__cond)
>{
>  return __gthrw_pthread_cond_signal (__cond);
>}
>
>static inline int
>__gthread_cond_wait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex)
>{
>  return __gthrw_pthread_cond_wait (__cond, __mutex);
>}
>
>static inline int
>__gthread_cond_timedwait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex,
>     const __gthread_time_t *__abs_timeout)
>{
>  return __gthrw_pthread_cond_timedwait (__cond, __mutex, __abs_timeout);
>}
>
>static inline int
>__gthread_cond_wait_recursive (__gthread_cond_t *__cond,
>          __gthread_recursive_mutex_t *__mutex)
>{
>  return __gthread_cond_wait (__cond, __mutex);
>}
>
>static inline int
>__gthread_cond_destroy (__gthread_cond_t* __cond)
>{
>  return __gthrw_pthread_cond_destroy (__cond);
>}
># 149 "/usr/include/c++/8/x86_64-redhat-linux/bits/gthr.h" 2 3
>
>
>#pragma GCC visibility pop
># 36 "/usr/include/c++/8/ext/atomicity.h" 2 3
># 1 "/usr/include/c++/8/x86_64-redhat-linux/bits/atomic_word.h" 1 3
># 32 "/usr/include/c++/8/x86_64-redhat-linux/bits/atomic_word.h" 3
>typedef int _Atomic_word;
># 37 "/usr/include/c++/8/ext/atomicity.h" 2 3
>
>namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>
>
>
>  static inline _Atomic_word
>  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
>  { return __atomic_fetch_add(__mem, __val, 4); }
>
>  static inline void
>  __atomic_add(volatile _Atomic_word* __mem, int __val)
>  { __atomic_fetch_add(__mem, __val, 4); }
># 64 "/usr/include/c++/8/ext/atomicity.h" 3
>  static inline _Atomic_word
>  __exchange_and_add_single(_Atomic_word* __mem, int __val)
>  {
>    _Atomic_word __result = *__mem;
>    *__mem += __val;
>    return __result;
>  }
>
>  static inline void
>  __atomic_add_single(_Atomic_word* __mem, int __val)
>  { *__mem += __val; }
>
>  static inline _Atomic_word
>  __attribute__ ((__unused__))
>  __exchange_and_add_dispatch(_Atomic_word* __mem, int __val)
>  {
>
>    if (__gthread_active_p())
>      return __exchange_and_add(__mem, __val);
>    else
>      return __exchange_and_add_single(__mem, __val);
>
>
>
>  }
>
>  static inline void
>  __attribute__ ((__unused__))
>  __atomic_add_dispatch(_Atomic_word* __mem, int __val)
>  {
>
>    if (__gthread_active_p())
>      __atomic_add(__mem, __val);
>    else
>      __atomic_add_single(__mem, __val);
>
>
>
>  }
>
>
>}
># 40 "/usr/include/c++/8/bits/ios_base.h" 2 3
>
># 1 "/usr/include/c++/8/bits/locale_classes.h" 1 3
># 37 "/usr/include/c++/8/bits/locale_classes.h" 3
>       
># 38 "/usr/include/c++/8/bits/locale_classes.h" 3
>
>
># 1 "/usr/include/c++/8/string" 1 3
># 36 "/usr/include/c++/8/string" 3
>       
># 37 "/usr/include/c++/8/string" 3
>
>
>
>
># 1 "/usr/include/c++/8/bits/allocator.h" 1 3
># 46 "/usr/include/c++/8/bits/allocator.h" 3
># 1 "/usr/include/c++/8/x86_64-redhat-linux/bits/c++allocator.h" 1 3
># 33 "/usr/include/c++/8/x86_64-redhat-linux/bits/c++allocator.h" 3
># 1 "/usr/include/c++/8/ext/new_allocator.h" 1 3
># 40 "/usr/include/c++/8/ext/new_allocator.h" 3
>namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
>{
>
>
>  using std::size_t;
>  using std::ptrdiff_t;
># 57 "/usr/include/c++/8/ext/new_allocator.h" 3
>  template<typename _Tp>
>    class new_allocator
>    {
>    public:
>      typedef size_t size_type;
>      typedef ptrdiff_t difference_type;
>      typedef _Tp* pointer;
>      typedef const _Tp* const_pointer;
>      typedef _Tp& reference;
>      typedef const _Tp& const_reference;
>      typedef _Tp value_type;
>
>      template<typename _Tp1>
> struct rebind
> { typedef new_allocator<_Tp1> other; };
>
>
>
>
>      typedef std::true_type propagate_on_container_move_assignment;
>
>
>      new_allocator() noexcept { }
>
>      new_allocator(const new_allocator&) noexcept { }
>
>      template<typename _Tp1>
> new_allocator(const new_allocator<_Tp1>&) noexcept { }
>
>      ~new_allocator() noexcept { }
>
>      pointer
>      address(reference __x) const noexcept
>      { return std::__addressof(__x); }
>
>      const_pointer
>      address(const_reference __x) const noexcept
>      { return std::__addressof(__x); }
>
>
>
>      pointer
>      allocate(size_type __n, const void* = static_cast<const void*>(0))
>      {
> if (__n > this->max_size())
>   std::__throw_bad_alloc();
># 111 "/usr/include/c++/8/ext/new_allocator.h" 3
> return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
>      }
>
>
>      void
>      deallocate(pointer __p, size_type)
>      {
>
>
>
>
>
>
>
> ::operator delete(__p);
>      }
>
>      size_type
>      max_size() const noexcept
>      { return size_t(-1) / sizeof(_Tp); }
>
>
>      template<typename _Up, typename... _Args>
> void
> construct(_Up* __p, _Args&&... __args)
> { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
>
>      template<typename _Up>
> void
> destroy(_Up* __p) { __p->~_Up(); }
># 151 "/usr/include/c++/8/ext/new_allocator.h" 3
>    };
>
>  template<typename _Tp>
>    inline bool
>    operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
>    { return true; }
>
>  template<typename _Tp>
>    inline bool
>    operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
>    { return false; }
>
>
>}
># 34 "/usr/include/c++/8/x86_64-redhat-linux/bits/c++allocator.h" 2 3
>
>
>namespace std
>{
># 47 "/usr/include/c++/8/x86_64-redhat-linux/bits/c++allocator.h" 3
>  template<typename _Tp>
>    using __allocator_base = __gnu_cxx::new_allocator<_Tp>;
>}
># 47 "/usr/include/c++/8/bits/allocator.h" 2 3
># 57 "/usr/include/c++/8/bits/allocator.h" 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>
>
>
>
>  template<>
>    class allocator<void>
>    {
>    public:
>      typedef size_t size_type;
>      typedef ptrdiff_t difference_type;
>      typedef void* pointer;
>      typedef const void* const_pointer;
>      typedef void value_type;
>
>      template<typename _Tp1>
> struct rebind
> { typedef allocator<_Tp1> other; };
>
>
>
>
>      typedef true_type propagate_on_container_move_assignment;
>
>      typedef true_type is_always_equal;
>
>      template<typename _Up, typename... _Args>
> void
> construct(_Up* __p, _Args&&... __args)
> { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
>
>      template<typename _Up>
> void
> destroy(_Up* __p) { __p->~_Up(); }
>
>    };
># 107 "/usr/include/c++/8/bits/allocator.h" 3
>  template<typename _Tp>
>    class allocator : public __allocator_base<_Tp>
>    {
>   public:
>      typedef size_t size_type;
>      typedef ptrdiff_t difference_type;
>      typedef _Tp* pointer;
>      typedef const _Tp* const_pointer;
>      typedef _Tp& reference;
>      typedef const _Tp& const_reference;
>      typedef _Tp value_type;
>
>      template<typename _Tp1>
> struct rebind
> { typedef allocator<_Tp1> other; };
>
>
>
>
>      typedef true_type propagate_on_container_move_assignment;
>
>      typedef true_type is_always_equal;
>
>
>      allocator() throw() { }
>
>      allocator(const allocator& __a) throw()
>      : __allocator_base<_Tp>(__a) { }
>
>      template<typename _Tp1>
> allocator(const allocator<_Tp1>&) throw() { }
>
>      ~allocator() throw() { }
>
>
>    };
>
>  template<typename _T1, typename _T2>
>    inline bool
>    operator==(const allocator<_T1>&, const allocator<_T2>&)
>    noexcept
>    { return true; }
>
>  template<typename _Tp>
>    inline bool
>    operator==(const allocator<_Tp>&, const allocator<_Tp>&)
>    noexcept
>    { return true; }
>
>  template<typename _T1, typename _T2>
>    inline bool
>    operator!=(const allocator<_T1>&, const allocator<_T2>&)
>    noexcept
>    { return false; }
>
>  template<typename _Tp>
>    inline bool
>    operator!=(const allocator<_Tp>&, const allocator<_Tp>&)
>    noexcept
>    { return false; }
>
>
>
>  template<typename _Tp>
>    class allocator<const _Tp>
>    {
>    public:
>      typedef _Tp value_type;
>      template<typename _Up> allocator(const allocator<_Up>&) { }
>    };
>
>  template<typename _Tp>
>    class allocator<volatile _Tp>
>    {
>    public:
>      typedef _Tp value_type;
>      template<typename _Up> allocator(const allocator<_Up>&) { }
>    };
>
>  template<typename _Tp>
>    class allocator<const volatile _Tp>
>    {
>    public:
>      typedef _Tp value_type;
>      template<typename _Up> allocator(const allocator<_Up>&) { }
>    };
>
>
>
>
>
>
>  extern template class allocator<char>;
>  extern template class allocator<wchar_t>;
>
>
>
>
>
>
>  template<typename _Alloc, bool = __is_empty(_Alloc)>
>    struct __alloc_swap
>    { static void _S_do_it(_Alloc&, _Alloc&) noexcept { } };
>
>  template<typename _Alloc>
>    struct __alloc_swap<_Alloc, false>
>    {
>      static void
>      _S_do_it(_Alloc& __one, _Alloc& __two) noexcept
>      {
>
> if (__one != __two)
>   swap(__one, __two);
>      }
>    };
>
>
>  template<typename _Alloc, bool = __is_empty(_Alloc)>
>    struct __alloc_neq
>    {
>      static bool
>      _S_do_it(const _Alloc&, const _Alloc&)
>      { return false; }
>    };
>
>  template<typename _Alloc>
>    struct __alloc_neq<_Alloc, false>
>    {
>      static bool
>      _S_do_it(const _Alloc& __one, const _Alloc& __two)
>      { return __one != __two; }
>    };
>
>
>  template<typename _Tp, bool
>    = __or_<is_copy_constructible<typename _Tp::value_type>,
>            is_nothrow_move_constructible<typename _Tp::value_type>>::value>
>    struct __shrink_to_fit_aux
>    { static bool _S_do_it(_Tp&) noexcept { return false; } };
>
>  template<typename _Tp>
>    struct __shrink_to_fit_aux<_Tp, true>
>    {
>      static bool
>      _S_do_it(_Tp& __c) noexcept
>      {
>
> try
>   {
>     _Tp(__make_move_if_noexcept_iterator(__c.begin()),
>  __make_move_if_noexcept_iterator(__c.end()),
>  __c.get_allocator()).swap(__c);
>     return true;
>   }
> catch(...)
>   { return false; }
>
>
>
>      }
>    };
>
>
>
>}
># 42 "/usr/include/c++/8/string" 2 3
>
>
># 1 "/usr/include/c++/8/bits/ostream_insert.h" 1 3
># 33 "/usr/include/c++/8/bits/ostream_insert.h" 3
>       
># 34 "/usr/include/c++/8/bits/ostream_insert.h" 3
>
>
># 1 "/usr/include/c++/8/bits/cxxabi_forced.h" 1 3
># 34 "/usr/include/c++/8/bits/cxxabi_forced.h" 3
>       
># 35 "/usr/include/c++/8/bits/cxxabi_forced.h" 3
>
>#pragma GCC visibility push(default)
>
>
>namespace __cxxabiv1
>{
>
>
>
>
>
>
>
>  class __forced_unwind
>  {
>    virtual ~__forced_unwind() throw();
>
>
>    virtual void __pure_dummy() = 0;
>  };
>}
>
>
>#pragma GCC visibility pop
># 37 "/usr/include/c++/8/bits/ostream_insert.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  template<typename _CharT, typename _Traits>
>    inline void
>    __ostream_write(basic_ostream<_CharT, _Traits>& __out,
>      const _CharT* __s, streamsize __n)
>    {
>      typedef basic_ostream<_CharT, _Traits> __ostream_type;
>      typedef typename __ostream_type::ios_base __ios_base;
>
>      const streamsize __put = __out.rdbuf()->sputn(__s, __n);
>      if (__put != __n)
> __out.setstate(__ios_base::badbit);
>    }
>
>  template<typename _CharT, typename _Traits>
>    inline void
>    __ostream_fill(basic_ostream<_CharT, _Traits>& __out, streamsize __n)
>    {
>      typedef basic_ostream<_CharT, _Traits> __ostream_type;
>      typedef typename __ostream_type::ios_base __ios_base;
>
>      const _CharT __c = __out.fill();
>      for (; __n > 0; --__n)
> {
>   const typename _Traits::int_type __put = __out.rdbuf()->sputc(__c);
>   if (_Traits::eq_int_type(__put, _Traits::eof()))
>     {
>       __out.setstate(__ios_base::badbit);
>       break;
>     }
> }
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits>&
>    __ostream_insert(basic_ostream<_CharT, _Traits>& __out,
>       const _CharT* __s, streamsize __n)
>    {
>      typedef basic_ostream<_CharT, _Traits> __ostream_type;
>      typedef typename __ostream_type::ios_base __ios_base;
>
>      typename __ostream_type::sentry __cerb(__out);
>      if (__cerb)
> {
>   try
>     {
>       const streamsize __w = __out.width();
>       if (__w > __n)
>  {
>    const bool __left = ((__out.flags()
>     & __ios_base::adjustfield)
>           == __ios_base::left);
>    if (!__left)
>      __ostream_fill(__out, __w - __n);
>    if (__out.good())
>      __ostream_write(__out, __s, __n);
>    if (__left && __out.good())
>      __ostream_fill(__out, __w - __n);
>  }
>       else
>  __ostream_write(__out, __s, __n);
>       __out.width(0);
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       __out._M_setstate(__ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { __out._M_setstate(__ios_base::badbit); }
> }
>      return __out;
>    }
>
>
>
>
>  extern template ostream& __ostream_insert(ostream&, const char*, streamsize);
>
>
>  extern template wostream& __ostream_insert(wostream&, const wchar_t*,
>          streamsize);
>
>
>
>
>}
># 45 "/usr/include/c++/8/string" 2 3
>
>
>
># 1 "/usr/include/c++/8/bits/stl_function.h" 1 3
># 63 "/usr/include/c++/8/bits/stl_function.h" 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 104 "/usr/include/c++/8/bits/stl_function.h" 3
>  template<typename _Arg, typename _Result>
>    struct unary_function
>    {
>
>      typedef _Arg argument_type;
>
>
>      typedef _Result result_type;
>    };
>
>
>
>
>  template<typename _Arg1, typename _Arg2, typename _Result>
>    struct binary_function
>    {
>
>      typedef _Arg1 first_argument_type;
>
>
>      typedef _Arg2 second_argument_type;
>
>
>      typedef _Result result_type;
>    };
># 144 "/usr/include/c++/8/bits/stl_function.h" 3
>  struct __is_transparent;
>
>  template<typename _Tp = void>
>    struct plus;
>
>  template<typename _Tp = void>
>    struct minus;
>
>  template<typename _Tp = void>
>    struct multiplies;
>
>  template<typename _Tp = void>
>    struct divides;
>
>  template<typename _Tp = void>
>    struct modulus;
>
>  template<typename _Tp = void>
>    struct negate;
>
>
>
>  template<typename _Tp>
>    struct plus : public binary_function<_Tp, _Tp, _Tp>
>    {
>      constexpr
>      _Tp
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x + __y; }
>    };
>
>
>  template<typename _Tp>
>    struct minus : public binary_function<_Tp, _Tp, _Tp>
>    {
>      constexpr
>      _Tp
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x - __y; }
>    };
>
>
>  template<typename _Tp>
>    struct multiplies : public binary_function<_Tp, _Tp, _Tp>
>    {
>      constexpr
>      _Tp
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x * __y; }
>    };
>
>
>  template<typename _Tp>
>    struct divides : public binary_function<_Tp, _Tp, _Tp>
>    {
>      constexpr
>      _Tp
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x / __y; }
>    };
>
>
>  template<typename _Tp>
>    struct modulus : public binary_function<_Tp, _Tp, _Tp>
>    {
>      constexpr
>      _Tp
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x % __y; }
>    };
>
>
>  template<typename _Tp>
>    struct negate : public unary_function<_Tp, _Tp>
>    {
>      constexpr
>      _Tp
>      operator()(const _Tp& __x) const
>      { return -__x; }
>    };
>
>
>
>
>
>  template<>
>    struct plus<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr
> auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) + std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) + std::forward<_Up>(__u))
> { return std::forward<_Tp>(__t) + std::forward<_Up>(__u); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>
>  template<>
>    struct minus<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr
> auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) - std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) - std::forward<_Up>(__u))
> { return std::forward<_Tp>(__t) - std::forward<_Up>(__u); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>
>  template<>
>    struct multiplies<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr
> auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) * std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) * std::forward<_Up>(__u))
> { return std::forward<_Tp>(__t) * std::forward<_Up>(__u); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>
>  template<>
>    struct divides<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr
> auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) / std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) / std::forward<_Up>(__u))
> { return std::forward<_Tp>(__t) / std::forward<_Up>(__u); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>
>  template<>
>    struct modulus<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr
> auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) % std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) % std::forward<_Up>(__u))
> { return std::forward<_Tp>(__t) % std::forward<_Up>(__u); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>
>  template<>
>    struct negate<void>
>    {
>      template <typename _Tp>
> constexpr
> auto
> operator()(_Tp&& __t) const
> noexcept(noexcept(-std::forward<_Tp>(__t)))
> -> decltype(-std::forward<_Tp>(__t))
> { return -std::forward<_Tp>(__t); }
>
>      typedef __is_transparent is_transparent;
>    };
># 330 "/usr/include/c++/8/bits/stl_function.h" 3
>  template<typename _Tp = void>
>    struct equal_to;
>
>  template<typename _Tp = void>
>    struct not_equal_to;
>
>  template<typename _Tp = void>
>    struct greater;
>
>  template<typename _Tp = void>
>    struct less;
>
>  template<typename _Tp = void>
>    struct greater_equal;
>
>  template<typename _Tp = void>
>    struct less_equal;
>
>
>
>  template<typename _Tp>
>    struct equal_to : public binary_function<_Tp, _Tp, bool>
>    {
>      constexpr
>      bool
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x == __y; }
>    };
>
>
>  template<typename _Tp>
>    struct not_equal_to : public binary_function<_Tp, _Tp, bool>
>    {
>      constexpr
>      bool
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x != __y; }
>    };
>
>
>  template<typename _Tp>
>    struct greater : public binary_function<_Tp, _Tp, bool>
>    {
>      constexpr
>      bool
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x > __y; }
>    };
>
>
>  template<typename _Tp>
>    struct less : public binary_function<_Tp, _Tp, bool>
>    {
>      constexpr
>      bool
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x < __y; }
>    };
>
>
>  template<typename _Tp>
>    struct greater_equal : public binary_function<_Tp, _Tp, bool>
>    {
>      constexpr
>      bool
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x >= __y; }
>    };
>
>
>  template<typename _Tp>
>    struct less_equal : public binary_function<_Tp, _Tp, bool>
>    {
>      constexpr
>      bool
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x <= __y; }
>    };
>
>
>  template<typename _Tp>
>    struct greater<_Tp*> : public binary_function<_Tp*, _Tp*, bool>
>    {
>      constexpr bool
>      operator()(_Tp* __x, _Tp* __y) const noexcept
>      {
> if (__builtin_constant_p (__x > __y))
>   return __x > __y;
> return (long unsigned int)__x > (long unsigned int)__y;
>      }
>    };
>
>
>  template<typename _Tp>
>    struct less<_Tp*> : public binary_function<_Tp*, _Tp*, bool>
>    {
>      constexpr bool
>      operator()(_Tp* __x, _Tp* __y) const noexcept
>      {
> if (__builtin_constant_p (__x < __y))
>   return __x < __y;
> return (long unsigned int)__x < (long unsigned int)__y;
>      }
>    };
>
>
>  template<typename _Tp>
>    struct greater_equal<_Tp*> : public binary_function<_Tp*, _Tp*, bool>
>    {
>      constexpr bool
>      operator()(_Tp* __x, _Tp* __y) const noexcept
>      {
> if (__builtin_constant_p (__x >= __y))
>   return __x >= __y;
> return (long unsigned int)__x >= (long unsigned int)__y;
>      }
>    };
>
>
>  template<typename _Tp>
>    struct less_equal<_Tp*> : public binary_function<_Tp*, _Tp*, bool>
>    {
>      constexpr bool
>      operator()(_Tp* __x, _Tp* __y) const noexcept
>      {
> if (__builtin_constant_p (__x <= __y))
>   return __x <= __y;
> return (long unsigned int)__x <= (long unsigned int)__y;
>      }
>    };
>
>
>
>  template<>
>    struct equal_to<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) == std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) == std::forward<_Up>(__u))
> { return std::forward<_Tp>(__t) == std::forward<_Up>(__u); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>
>  template<>
>    struct not_equal_to<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) != std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) != std::forward<_Up>(__u))
> { return std::forward<_Tp>(__t) != std::forward<_Up>(__u); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>
>  template<>
>    struct greater<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) > std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) > std::forward<_Up>(__u))
> {
>   return _S_cmp(std::forward<_Tp>(__t), std::forward<_Up>(__u),
>   __ptr_cmp<_Tp, _Up>{});
> }
>
>      template<typename _Tp, typename _Up>
> constexpr bool
> operator()(_Tp* __t, _Up* __u) const noexcept
> { return greater<common_type_t<_Tp*, _Up*>>{}(__t, __u); }
>
>      typedef __is_transparent is_transparent;
>
>    private:
>      template <typename _Tp, typename _Up>
> static constexpr decltype(auto)
> _S_cmp(_Tp&& __t, _Up&& __u, false_type)
> { return std::forward<_Tp>(__t) > std::forward<_Up>(__u); }
>
>      template <typename _Tp, typename _Up>
> static constexpr bool
> _S_cmp(_Tp&& __t, _Up&& __u, true_type) noexcept
> {
>   return greater<const volatile void*>{}(
>       static_cast<const volatile void*>(std::forward<_Tp>(__t)),
>       static_cast<const volatile void*>(std::forward<_Up>(__u)));
> }
>
>
>      template<typename _Tp, typename _Up, typename = void>
> struct __not_overloaded2 : true_type { };
>
>
>      template<typename _Tp, typename _Up>
> struct __not_overloaded2<_Tp, _Up, __void_t<
>   decltype(std::declval<_Tp>().operator>(std::declval<_Up>()))>>
> : false_type { };
>
>
>      template<typename _Tp, typename _Up, typename = void>
> struct __not_overloaded : __not_overloaded2<_Tp, _Up> { };
>
>
>      template<typename _Tp, typename _Up>
> struct __not_overloaded<_Tp, _Up, __void_t<
>   decltype(operator>(std::declval<_Tp>(), std::declval<_Up>()))>>
> : false_type { };
>
>      template<typename _Tp, typename _Up>
> using __ptr_cmp = __and_<__not_overloaded<_Tp, _Up>,
>       is_convertible<_Tp, const volatile void*>,
>       is_convertible<_Up, const volatile void*>>;
>    };
>
>
>  template<>
>    struct less<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) < std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) < std::forward<_Up>(__u))
> {
>   return _S_cmp(std::forward<_Tp>(__t), std::forward<_Up>(__u),
>   __ptr_cmp<_Tp, _Up>{});
> }
>
>      template<typename _Tp, typename _Up>
> constexpr bool
> operator()(_Tp* __t, _Up* __u) const noexcept
> { return less<common_type_t<_Tp*, _Up*>>{}(__t, __u); }
>
>      typedef __is_transparent is_transparent;
>
>    private:
>      template <typename _Tp, typename _Up>
> static constexpr decltype(auto)
> _S_cmp(_Tp&& __t, _Up&& __u, false_type)
> { return std::forward<_Tp>(__t) < std::forward<_Up>(__u); }
>
>      template <typename _Tp, typename _Up>
> static constexpr bool
> _S_cmp(_Tp&& __t, _Up&& __u, true_type) noexcept
> {
>   return less<const volatile void*>{}(
>       static_cast<const volatile void*>(std::forward<_Tp>(__t)),
>       static_cast<const volatile void*>(std::forward<_Up>(__u)));
> }
>
>
>      template<typename _Tp, typename _Up, typename = void>
> struct __not_overloaded2 : true_type { };
>
>
>      template<typename _Tp, typename _Up>
> struct __not_overloaded2<_Tp, _Up, __void_t<
>   decltype(std::declval<_Tp>().operator<(std::declval<_Up>()))>>
> : false_type { };
>
>
>      template<typename _Tp, typename _Up, typename = void>
> struct __not_overloaded : __not_overloaded2<_Tp, _Up> { };
>
>
>      template<typename _Tp, typename _Up>
> struct __not_overloaded<_Tp, _Up, __void_t<
>   decltype(operator<(std::declval<_Tp>(), std::declval<_Up>()))>>
> : false_type { };
>
>      template<typename _Tp, typename _Up>
> using __ptr_cmp = __and_<__not_overloaded<_Tp, _Up>,
>       is_convertible<_Tp, const volatile void*>,
>       is_convertible<_Up, const volatile void*>>;
>    };
>
>
>  template<>
>    struct greater_equal<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) >= std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) >= std::forward<_Up>(__u))
> {
>   return _S_cmp(std::forward<_Tp>(__t), std::forward<_Up>(__u),
>   __ptr_cmp<_Tp, _Up>{});
> }
>
>      template<typename _Tp, typename _Up>
> constexpr bool
> operator()(_Tp* __t, _Up* __u) const noexcept
> { return greater_equal<common_type_t<_Tp*, _Up*>>{}(__t, __u); }
>
>      typedef __is_transparent is_transparent;
>
>    private:
>      template <typename _Tp, typename _Up>
> static constexpr decltype(auto)
> _S_cmp(_Tp&& __t, _Up&& __u, false_type)
> { return std::forward<_Tp>(__t) >= std::forward<_Up>(__u); }
>
>      template <typename _Tp, typename _Up>
> static constexpr bool
> _S_cmp(_Tp&& __t, _Up&& __u, true_type) noexcept
> {
>   return greater_equal<const volatile void*>{}(
>       static_cast<const volatile void*>(std::forward<_Tp>(__t)),
>       static_cast<const volatile void*>(std::forward<_Up>(__u)));
> }
>
>
>      template<typename _Tp, typename _Up, typename = void>
> struct __not_overloaded2 : true_type { };
>
>
>      template<typename _Tp, typename _Up>
> struct __not_overloaded2<_Tp, _Up, __void_t<
>   decltype(std::declval<_Tp>().operator>=(std::declval<_Up>()))>>
> : false_type { };
>
>
>      template<typename _Tp, typename _Up, typename = void>
> struct __not_overloaded : __not_overloaded2<_Tp, _Up> { };
>
>
>      template<typename _Tp, typename _Up>
> struct __not_overloaded<_Tp, _Up, __void_t<
>   decltype(operator>=(std::declval<_Tp>(), std::declval<_Up>()))>>
> : false_type { };
>
>      template<typename _Tp, typename _Up>
> using __ptr_cmp = __and_<__not_overloaded<_Tp, _Up>,
>       is_convertible<_Tp, const volatile void*>,
>       is_convertible<_Up, const volatile void*>>;
>    };
>
>
>  template<>
>    struct less_equal<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) <= std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) <= std::forward<_Up>(__u))
> {
>   return _S_cmp(std::forward<_Tp>(__t), std::forward<_Up>(__u),
>   __ptr_cmp<_Tp, _Up>{});
> }
>
>      template<typename _Tp, typename _Up>
> constexpr bool
> operator()(_Tp* __t, _Up* __u) const noexcept
> { return less_equal<common_type_t<_Tp*, _Up*>>{}(__t, __u); }
>
>      typedef __is_transparent is_transparent;
>
>    private:
>      template <typename _Tp, typename _Up>
> static constexpr decltype(auto)
> _S_cmp(_Tp&& __t, _Up&& __u, false_type)
> { return std::forward<_Tp>(__t) <= std::forward<_Up>(__u); }
>
>      template <typename _Tp, typename _Up>
> static constexpr bool
> _S_cmp(_Tp&& __t, _Up&& __u, true_type) noexcept
> {
>   return less_equal<const volatile void*>{}(
>       static_cast<const volatile void*>(std::forward<_Tp>(__t)),
>       static_cast<const volatile void*>(std::forward<_Up>(__u)));
> }
>
>
>      template<typename _Tp, typename _Up, typename = void>
> struct __not_overloaded2 : true_type { };
>
>
>      template<typename _Tp, typename _Up>
> struct __not_overloaded2<_Tp, _Up, __void_t<
>   decltype(std::declval<_Tp>().operator<=(std::declval<_Up>()))>>
> : false_type { };
>
>
>      template<typename _Tp, typename _Up, typename = void>
> struct __not_overloaded : __not_overloaded2<_Tp, _Up> { };
>
>
>      template<typename _Tp, typename _Up>
> struct __not_overloaded<_Tp, _Up, __void_t<
>   decltype(operator<=(std::declval<_Tp>(), std::declval<_Up>()))>>
> : false_type { };
>
>      template<typename _Tp, typename _Up>
> using __ptr_cmp = __and_<__not_overloaded<_Tp, _Up>,
>       is_convertible<_Tp, const volatile void*>,
>       is_convertible<_Up, const volatile void*>>;
>    };
># 750 "/usr/include/c++/8/bits/stl_function.h" 3
>  template<typename _Tp = void>
>    struct logical_and;
>
>  template<typename _Tp = void>
>    struct logical_or;
>
>  template<typename _Tp = void>
>    struct logical_not;
>
>
>
>  template<typename _Tp>
>    struct logical_and : public binary_function<_Tp, _Tp, bool>
>    {
>      constexpr
>      bool
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x && __y; }
>    };
>
>
>  template<typename _Tp>
>    struct logical_or : public binary_function<_Tp, _Tp, bool>
>    {
>      constexpr
>      bool
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x || __y; }
>    };
>
>
>  template<typename _Tp>
>    struct logical_not : public unary_function<_Tp, bool>
>    {
>      constexpr
>      bool
>      operator()(const _Tp& __x) const
>      { return !__x; }
>    };
>
>
>
>  template<>
>    struct logical_and<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr
> auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) && std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) && std::forward<_Up>(__u))
> { return std::forward<_Tp>(__t) && std::forward<_Up>(__u); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>
>  template<>
>    struct logical_or<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr
> auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) || std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) || std::forward<_Up>(__u))
> { return std::forward<_Tp>(__t) || std::forward<_Up>(__u); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>
>  template<>
>    struct logical_not<void>
>    {
>      template <typename _Tp>
> constexpr
> auto
> operator()(_Tp&& __t) const
> noexcept(noexcept(!std::forward<_Tp>(__t)))
> -> decltype(!std::forward<_Tp>(__t))
> { return !std::forward<_Tp>(__t); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>
>
>
>  template<typename _Tp = void>
>    struct bit_and;
>
>  template<typename _Tp = void>
>    struct bit_or;
>
>  template<typename _Tp = void>
>    struct bit_xor;
>
>  template<typename _Tp = void>
>    struct bit_not;
>
>
>
>
>  template<typename _Tp>
>    struct bit_and : public binary_function<_Tp, _Tp, _Tp>
>    {
>      constexpr
>      _Tp
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x & __y; }
>    };
>
>  template<typename _Tp>
>    struct bit_or : public binary_function<_Tp, _Tp, _Tp>
>    {
>      constexpr
>      _Tp
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x | __y; }
>    };
>
>  template<typename _Tp>
>    struct bit_xor : public binary_function<_Tp, _Tp, _Tp>
>    {
>      constexpr
>      _Tp
>      operator()(const _Tp& __x, const _Tp& __y) const
>      { return __x ^ __y; }
>    };
>
>  template<typename _Tp>
>    struct bit_not : public unary_function<_Tp, _Tp>
>    {
>    constexpr
>      _Tp
>      operator()(const _Tp& __x) const
>      { return ~__x; }
>    };
>
>
>  template <>
>    struct bit_and<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr
> auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) & std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) & std::forward<_Up>(__u))
> { return std::forward<_Tp>(__t) & std::forward<_Up>(__u); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>  template <>
>    struct bit_or<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr
> auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) | std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) | std::forward<_Up>(__u))
> { return std::forward<_Tp>(__t) | std::forward<_Up>(__u); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>  template <>
>    struct bit_xor<void>
>    {
>      template <typename _Tp, typename _Up>
> constexpr
> auto
> operator()(_Tp&& __t, _Up&& __u) const
> noexcept(noexcept(std::forward<_Tp>(__t) ^ std::forward<_Up>(__u)))
> -> decltype(std::forward<_Tp>(__t) ^ std::forward<_Up>(__u))
> { return std::forward<_Tp>(__t) ^ std::forward<_Up>(__u); }
>
>      typedef __is_transparent is_transparent;
>    };
>
>  template <>
>    struct bit_not<void>
>    {
>      template <typename _Tp>
> constexpr
> auto
> operator()(_Tp&& __t) const
> noexcept(noexcept(~std::forward<_Tp>(__t)))
> -> decltype(~std::forward<_Tp>(__t))
> { return ~std::forward<_Tp>(__t); }
>
>      typedef __is_transparent is_transparent;
>    };
># 978 "/usr/include/c++/8/bits/stl_function.h" 3
>  template<typename _Predicate>
>    class unary_negate
>    : public unary_function<typename _Predicate::argument_type, bool>
>    {
>    protected:
>      _Predicate _M_pred;
>
>    public:
>      constexpr
>      explicit
>      unary_negate(const _Predicate& __x) : _M_pred(__x) { }
>
>      constexpr
>      bool
>      operator()(const typename _Predicate::argument_type& __x) const
>      { return !_M_pred(__x); }
>    };
>
>
>  template<typename _Predicate>
>    constexpr
>    inline unary_negate<_Predicate>
>    not1(const _Predicate& __pred)
>    { return unary_negate<_Predicate>(__pred); }
>
>
>  template<typename _Predicate>
>    class binary_negate
>    : public binary_function<typename _Predicate::first_argument_type,
>        typename _Predicate::second_argument_type, bool>
>    {
>    protected:
>      _Predicate _M_pred;
>
>    public:
>      constexpr
>      explicit
>      binary_negate(const _Predicate& __x) : _M_pred(__x) { }
>
>      constexpr
>      bool
>      operator()(const typename _Predicate::first_argument_type& __x,
>   const typename _Predicate::second_argument_type& __y) const
>      { return !_M_pred(__x, __y); }
>    };
>
>
>  template<typename _Predicate>
>    constexpr
>    inline binary_negate<_Predicate>
>    not2(const _Predicate& __pred)
>    { return binary_negate<_Predicate>(__pred); }
># 1055 "/usr/include/c++/8/bits/stl_function.h" 3
>  template<typename _Arg, typename _Result>
>    class pointer_to_unary_function : public unary_function<_Arg, _Result>
>    {
>    protected:
>      _Result (*_M_ptr)(_Arg);
>
>    public:
>      pointer_to_unary_function() { }
>
>      explicit
>      pointer_to_unary_function(_Result (*__x)(_Arg))
>      : _M_ptr(__x) { }
>
>      _Result
>      operator()(_Arg __x) const
>      { return _M_ptr(__x); }
>    };
>
>
>  template<typename _Arg, typename _Result>
>    inline pointer_to_unary_function<_Arg, _Result>
>    ptr_fun(_Result (*__x)(_Arg))
>    { return pointer_to_unary_function<_Arg, _Result>(__x); }
>
>
>  template<typename _Arg1, typename _Arg2, typename _Result>
>    class pointer_to_binary_function
>    : public binary_function<_Arg1, _Arg2, _Result>
>    {
>    protected:
>      _Result (*_M_ptr)(_Arg1, _Arg2);
>
>    public:
>      pointer_to_binary_function() { }
>
>      explicit
>      pointer_to_binary_function(_Result (*__x)(_Arg1, _Arg2))
>      : _M_ptr(__x) { }
>
>      _Result
>      operator()(_Arg1 __x, _Arg2 __y) const
>      { return _M_ptr(__x, __y); }
>    };
>
>
>  template<typename _Arg1, typename _Arg2, typename _Result>
>    inline pointer_to_binary_function<_Arg1, _Arg2, _Result>
>    ptr_fun(_Result (*__x)(_Arg1, _Arg2))
>    { return pointer_to_binary_function<_Arg1, _Arg2, _Result>(__x); }
>
>
>  template<typename _Tp>
>    struct _Identity
>    : public unary_function<_Tp, _Tp>
>    {
>      _Tp&
>      operator()(_Tp& __x) const
>      { return __x; }
>
>      const _Tp&
>      operator()(const _Tp& __x) const
>      { return __x; }
>    };
>
>
>  template<typename _Tp> struct _Identity<const _Tp> : _Identity<_Tp> { };
>
>  template<typename _Pair>
>    struct _Select1st
>    : public unary_function<_Pair, typename _Pair::first_type>
>    {
>      typename _Pair::first_type&
>      operator()(_Pair& __x) const
>      { return __x.first; }
>
>      const typename _Pair::first_type&
>      operator()(const _Pair& __x) const
>      { return __x.first; }
>
>
>      template<typename _Pair2>
>        typename _Pair2::first_type&
>        operator()(_Pair2& __x) const
>        { return __x.first; }
>
>      template<typename _Pair2>
>        const typename _Pair2::first_type&
>        operator()(const _Pair2& __x) const
>        { return __x.first; }
>
>    };
>
>  template<typename _Pair>
>    struct _Select2nd
>    : public unary_function<_Pair, typename _Pair::second_type>
>    {
>      typename _Pair::second_type&
>      operator()(_Pair& __x) const
>      { return __x.second; }
>
>      const typename _Pair::second_type&
>      operator()(const _Pair& __x) const
>      { return __x.second; }
>    };
># 1178 "/usr/include/c++/8/bits/stl_function.h" 3
>  template<typename _Ret, typename _Tp>
>    class mem_fun_t : public unary_function<_Tp*, _Ret>
>    {
>    public:
>      explicit
>      mem_fun_t(_Ret (_Tp::*__pf)())
>      : _M_f(__pf) { }
>
>      _Ret
>      operator()(_Tp* __p) const
>      { return (__p->*_M_f)(); }
>
>    private:
>      _Ret (_Tp::*_M_f)();
>    };
>
>
>
>  template<typename _Ret, typename _Tp>
>    class const_mem_fun_t : public unary_function<const _Tp*, _Ret>
>    {
>    public:
>      explicit
>      const_mem_fun_t(_Ret (_Tp::*__pf)() const)
>      : _M_f(__pf) { }
>
>      _Ret
>      operator()(const _Tp* __p) const
>      { return (__p->*_M_f)(); }
>
>    private:
>      _Ret (_Tp::*_M_f)() const;
>    };
>
>
>
>  template<typename _Ret, typename _Tp>
>    class mem_fun_ref_t : public unary_function<_Tp, _Ret>
>    {
>    public:
>      explicit
>      mem_fun_ref_t(_Ret (_Tp::*__pf)())
>      : _M_f(__pf) { }
>
>      _Ret
>      operator()(_Tp& __r) const
>      { return (__r.*_M_f)(); }
>
>    private:
>      _Ret (_Tp::*_M_f)();
>  };
>
>
>
>  template<typename _Ret, typename _Tp>
>    class const_mem_fun_ref_t : public unary_function<_Tp, _Ret>
>    {
>    public:
>      explicit
>      const_mem_fun_ref_t(_Ret (_Tp::*__pf)() const)
>      : _M_f(__pf) { }
>
>      _Ret
>      operator()(const _Tp& __r) const
>      { return (__r.*_M_f)(); }
>
>    private:
>      _Ret (_Tp::*_M_f)() const;
>    };
>
>
>
>  template<typename _Ret, typename _Tp, typename _Arg>
>    class mem_fun1_t : public binary_function<_Tp*, _Arg, _Ret>
>    {
>    public:
>      explicit
>      mem_fun1_t(_Ret (_Tp::*__pf)(_Arg))
>      : _M_f(__pf) { }
>
>      _Ret
>      operator()(_Tp* __p, _Arg __x) const
>      { return (__p->*_M_f)(__x); }
>
>    private:
>      _Ret (_Tp::*_M_f)(_Arg);
>    };
>
>
>
>  template<typename _Ret, typename _Tp, typename _Arg>
>    class const_mem_fun1_t : public binary_function<const _Tp*, _Arg, _Ret>
>    {
>    public:
>      explicit
>      const_mem_fun1_t(_Ret (_Tp::*__pf)(_Arg) const)
>      : _M_f(__pf) { }
>
>      _Ret
>      operator()(const _Tp* __p, _Arg __x) const
>      { return (__p->*_M_f)(__x); }
>
>    private:
>      _Ret (_Tp::*_M_f)(_Arg) const;
>    };
>
>
>
>  template<typename _Ret, typename _Tp, typename _Arg>
>    class mem_fun1_ref_t : public binary_function<_Tp, _Arg, _Ret>
>    {
>    public:
>      explicit
>      mem_fun1_ref_t(_Ret (_Tp::*__pf)(_Arg))
>      : _M_f(__pf) { }
>
>      _Ret
>      operator()(_Tp& __r, _Arg __x) const
>      { return (__r.*_M_f)(__x); }
>
>    private:
>      _Ret (_Tp::*_M_f)(_Arg);
>    };
>
>
>
>  template<typename _Ret, typename _Tp, typename _Arg>
>    class const_mem_fun1_ref_t : public binary_function<_Tp, _Arg, _Ret>
>    {
>    public:
>      explicit
>      const_mem_fun1_ref_t(_Ret (_Tp::*__pf)(_Arg) const)
>      : _M_f(__pf) { }
>
>      _Ret
>      operator()(const _Tp& __r, _Arg __x) const
>      { return (__r.*_M_f)(__x); }
>
>    private:
>      _Ret (_Tp::*_M_f)(_Arg) const;
>    };
>
>
>
>  template<typename _Ret, typename _Tp>
>    inline mem_fun_t<_Ret, _Tp>
>    mem_fun(_Ret (_Tp::*__f)())
>    { return mem_fun_t<_Ret, _Tp>(__f); }
>
>  template<typename _Ret, typename _Tp>
>    inline const_mem_fun_t<_Ret, _Tp>
>    mem_fun(_Ret (_Tp::*__f)() const)
>    { return const_mem_fun_t<_Ret, _Tp>(__f); }
>
>  template<typename _Ret, typename _Tp>
>    inline mem_fun_ref_t<_Ret, _Tp>
>    mem_fun_ref(_Ret (_Tp::*__f)())
>    { return mem_fun_ref_t<_Ret, _Tp>(__f); }
>
>  template<typename _Ret, typename _Tp>
>    inline const_mem_fun_ref_t<_Ret, _Tp>
>    mem_fun_ref(_Ret (_Tp::*__f)() const)
>    { return const_mem_fun_ref_t<_Ret, _Tp>(__f); }
>
>  template<typename _Ret, typename _Tp, typename _Arg>
>    inline mem_fun1_t<_Ret, _Tp, _Arg>
>    mem_fun(_Ret (_Tp::*__f)(_Arg))
>    { return mem_fun1_t<_Ret, _Tp, _Arg>(__f); }
>
>  template<typename _Ret, typename _Tp, typename _Arg>
>    inline const_mem_fun1_t<_Ret, _Tp, _Arg>
>    mem_fun(_Ret (_Tp::*__f)(_Arg) const)
>    { return const_mem_fun1_t<_Ret, _Tp, _Arg>(__f); }
>
>  template<typename _Ret, typename _Tp, typename _Arg>
>    inline mem_fun1_ref_t<_Ret, _Tp, _Arg>
>    mem_fun_ref(_Ret (_Tp::*__f)(_Arg))
>    { return mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }
>
>  template<typename _Ret, typename _Tp, typename _Arg>
>    inline const_mem_fun1_ref_t<_Ret, _Tp, _Arg>
>    mem_fun_ref(_Ret (_Tp::*__f)(_Arg) const)
>    { return const_mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }
>
>
>
>
>}
>
>
># 1 "/usr/include/c++/8/backward/binders.h" 1 3
># 60 "/usr/include/c++/8/backward/binders.h" 3
>#pragma GCC diagnostic push
>#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 107 "/usr/include/c++/8/backward/binders.h" 3
>  template<typename _Operation>
>    class binder1st
>    : public unary_function<typename _Operation::second_argument_type,
>       typename _Operation::result_type>
>    {
>    protected:
>      _Operation op;
>      typename _Operation::first_argument_type value;
>
>    public:
>      binder1st(const _Operation& __x,
>  const typename _Operation::first_argument_type& __y)
>      : op(__x), value(__y) { }
>
>      typename _Operation::result_type
>      operator()(const typename _Operation::second_argument_type& __x) const
>      { return op(value, __x); }
>
>
>
>      typename _Operation::result_type
>      operator()(typename _Operation::second_argument_type& __x) const
>      { return op(value, __x); }
>    } __attribute__ ((__deprecated__));
>
>
>  template<typename _Operation, typename _Tp>
>    inline binder1st<_Operation>
>    bind1st(const _Operation& __fn, const _Tp& __x)
>    {
>      typedef typename _Operation::first_argument_type _Arg1_type;
>      return binder1st<_Operation>(__fn, _Arg1_type(__x));
>    }
>
>
>  template<typename _Operation>
>    class binder2nd
>    : public unary_function<typename _Operation::first_argument_type,
>       typename _Operation::result_type>
>    {
>    protected:
>      _Operation op;
>      typename _Operation::second_argument_type value;
>
>    public:
>      binder2nd(const _Operation& __x,
>  const typename _Operation::second_argument_type& __y)
>      : op(__x), value(__y) { }
>
>      typename _Operation::result_type
>      operator()(const typename _Operation::first_argument_type& __x) const
>      { return op(__x, value); }
>
>
>
>      typename _Operation::result_type
>      operator()(typename _Operation::first_argument_type& __x) const
>      { return op(__x, value); }
>    } __attribute__ ((__deprecated__));
>
>
>  template<typename _Operation, typename _Tp>
>    inline binder2nd<_Operation>
>    bind2nd(const _Operation& __fn, const _Tp& __x)
>    {
>      typedef typename _Operation::second_argument_type _Arg2_type;
>      return binder2nd<_Operation>(__fn, _Arg2_type(__x));
>    }
>
>
>
>}
>
>#pragma GCC diagnostic pop
># 1369 "/usr/include/c++/8/bits/stl_function.h" 2 3
># 49 "/usr/include/c++/8/string" 2 3
>
>
># 1 "/usr/include/c++/8/bits/range_access.h" 1 3
># 33 "/usr/include/c++/8/bits/range_access.h" 3
>       
># 34 "/usr/include/c++/8/bits/range_access.h" 3
>
>
># 1 "/usr/include/c++/8/initializer_list" 1 3
># 33 "/usr/include/c++/8/initializer_list" 3
>       
># 34 "/usr/include/c++/8/initializer_list" 3
>
>
>
>
>
>#pragma GCC visibility push(default)
>
>
>
>namespace std
>{
>
>  template<class _E>
>    class initializer_list
>    {
>    public:
>      typedef _E value_type;
>      typedef const _E& reference;
>      typedef const _E& const_reference;
>      typedef size_t size_type;
>      typedef const _E* iterator;
>      typedef const _E* const_iterator;
>
>    private:
>      iterator _M_array;
>      size_type _M_len;
>
>
>      constexpr initializer_list(const_iterator __a, size_type __l)
>      : _M_array(__a), _M_len(__l) { }
>
>    public:
>      constexpr initializer_list() noexcept
>      : _M_array(0), _M_len(0) { }
>
>
>      constexpr size_type
>      size() const noexcept { return _M_len; }
>
>
>      constexpr const_iterator
>      begin() const noexcept { return _M_array; }
>
>
>      constexpr const_iterator
>      end() const noexcept { return begin() + size(); }
>    };
>
>
>
>
>
>
>  template<class _Tp>
>    constexpr const _Tp*
>    begin(initializer_list<_Tp> __ils) noexcept
>    { return __ils.begin(); }
>
>
>
>
>
>
>  template<class _Tp>
>    constexpr const _Tp*
>    end(initializer_list<_Tp> __ils) noexcept
>    { return __ils.end(); }
>}
>
>#pragma GCC visibility pop
># 37 "/usr/include/c++/8/bits/range_access.h" 2 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>
>
>
>  template<typename _Container>
>    inline auto
>    begin(_Container& __cont) -> decltype(__cont.begin())
>    { return __cont.begin(); }
>
>
>
>
>
>
>  template<typename _Container>
>    inline auto
>    begin(const _Container& __cont) -> decltype(__cont.begin())
>    { return __cont.begin(); }
>
>
>
>
>
>
>  template<typename _Container>
>    inline auto
>    end(_Container& __cont) -> decltype(__cont.end())
>    { return __cont.end(); }
>
>
>
>
>
>
>  template<typename _Container>
>    inline auto
>    end(const _Container& __cont) -> decltype(__cont.end())
>    { return __cont.end(); }
>
>
>
>
>
>  template<typename _Tp, size_t _Nm>
>    inline constexpr _Tp*
>    begin(_Tp (&__arr)[_Nm])
>    { return __arr; }
>
>
>
>
>
>
>  template<typename _Tp, size_t _Nm>
>    inline constexpr _Tp*
>    end(_Tp (&__arr)[_Nm])
>    { return __arr + _Nm; }
>
>
>
>  template<typename _Tp> class valarray;
>
>  template<typename _Tp> _Tp* begin(valarray<_Tp>&);
>  template<typename _Tp> const _Tp* begin(const valarray<_Tp>&);
>  template<typename _Tp> _Tp* end(valarray<_Tp>&);
>  template<typename _Tp> const _Tp* end(const valarray<_Tp>&);
>
>
>
>
>
>
>  template<typename _Container>
>    inline constexpr auto
>    cbegin(const _Container& __cont) noexcept(noexcept(std::begin(__cont)))
>      -> decltype(std::begin(__cont))
>    { return std::begin(__cont); }
>
>
>
>
>
>
>  template<typename _Container>
>    inline constexpr auto
>    cend(const _Container& __cont) noexcept(noexcept(std::end(__cont)))
>      -> decltype(std::end(__cont))
>    { return std::end(__cont); }
>
>
>
>
>
>
>  template<typename _Container>
>    inline auto
>    rbegin(_Container& __cont) -> decltype(__cont.rbegin())
>    { return __cont.rbegin(); }
>
>
>
>
>
>
>  template<typename _Container>
>    inline auto
>    rbegin(const _Container& __cont) -> decltype(__cont.rbegin())
>    { return __cont.rbegin(); }
>
>
>
>
>
>
>  template<typename _Container>
>    inline auto
>    rend(_Container& __cont) -> decltype(__cont.rend())
>    { return __cont.rend(); }
>
>
>
>
>
>
>  template<typename _Container>
>    inline auto
>    rend(const _Container& __cont) -> decltype(__cont.rend())
>    { return __cont.rend(); }
>
>
>
>
>
>
>  template<typename _Tp, size_t _Nm>
>    inline reverse_iterator<_Tp*>
>    rbegin(_Tp (&__arr)[_Nm])
>    { return reverse_iterator<_Tp*>(__arr + _Nm); }
>
>
>
>
>
>
>  template<typename _Tp, size_t _Nm>
>    inline reverse_iterator<_Tp*>
>    rend(_Tp (&__arr)[_Nm])
>    { return reverse_iterator<_Tp*>(__arr); }
>
>
>
>
>
>
>  template<typename _Tp>
>    inline reverse_iterator<const _Tp*>
>    rbegin(initializer_list<_Tp> __il)
>    { return reverse_iterator<const _Tp*>(__il.end()); }
>
>
>
>
>
>
>  template<typename _Tp>
>    inline reverse_iterator<const _Tp*>
>    rend(initializer_list<_Tp> __il)
>    { return reverse_iterator<const _Tp*>(__il.begin()); }
>
>
>
>
>
>
>  template<typename _Container>
>    inline auto
>    crbegin(const _Container& __cont) -> decltype(std::rbegin(__cont))
>    { return std::rbegin(__cont); }
>
>
>
>
>
>
>  template<typename _Container>
>    inline auto
>    crend(const _Container& __cont) -> decltype(std::rend(__cont))
>    { return std::rend(__cont); }
># 323 "/usr/include/c++/8/bits/range_access.h" 3
>
>}
># 52 "/usr/include/c++/8/string" 2 3
># 1 "/usr/include/c++/8/bits/basic_string.h" 1 3
># 37 "/usr/include/c++/8/bits/basic_string.h" 3
>       
># 38 "/usr/include/c++/8/bits/basic_string.h" 3
>
>
># 1 "/usr/include/c++/8/ext/alloc_traits.h" 1 3
># 32 "/usr/include/c++/8/ext/alloc_traits.h" 3
>       
># 33 "/usr/include/c++/8/ext/alloc_traits.h" 3
>
>
>
># 1 "/usr/include/c++/8/bits/alloc_traits.h" 1 3
># 41 "/usr/include/c++/8/bits/alloc_traits.h" 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  struct __allocator_traits_base
>  {
>    template<typename _Tp, typename _Up, typename = void>
>      struct __rebind : __replace_first_arg<_Tp, _Up> { };
>
>    template<typename _Tp, typename _Up>
>      struct __rebind<_Tp, _Up,
>        __void_t<typename _Tp::template rebind<_Up>::other>>
>      { using type = typename _Tp::template rebind<_Up>::other; };
>
>  protected:
>    template<typename _Tp>
>      using __pointer = typename _Tp::pointer;
>    template<typename _Tp>
>      using __c_pointer = typename _Tp::const_pointer;
>    template<typename _Tp>
>      using __v_pointer = typename _Tp::void_pointer;
>    template<typename _Tp>
>      using __cv_pointer = typename _Tp::const_void_pointer;
>    template<typename _Tp>
>      using __pocca = typename _Tp::propagate_on_container_copy_assignment;
>    template<typename _Tp>
>      using __pocma = typename _Tp::propagate_on_container_move_assignment;
>    template<typename _Tp>
>      using __pocs = typename _Tp::propagate_on_container_swap;
>    template<typename _Tp>
>      using __equal = typename _Tp::is_always_equal;
>  };
>
>  template<typename _Alloc, typename _Up>
>    using __alloc_rebind
>      = typename __allocator_traits_base::template __rebind<_Alloc, _Up>::type;
>
>
>
>
>
>  template<typename _Alloc>
>    struct allocator_traits : __allocator_traits_base
>    {
>
>      typedef _Alloc allocator_type;
>
>      typedef typename _Alloc::value_type value_type;
>
>
>
>
>
>
>      using pointer = __detected_or_t<value_type*, __pointer, _Alloc>;
>
>    private:
>
>      template<template<typename> class _Func, typename _Tp, typename = void>
> struct _Ptr
> {
>   using type = typename pointer_traits<pointer>::template rebind<_Tp>;
> };
>
>      template<template<typename> class _Func, typename _Tp>
> struct _Ptr<_Func, _Tp, __void_t<_Func<_Alloc>>>
> {
>   using type = _Func<_Alloc>;
> };
>
>
>      template<typename _A2, typename _PtrT, typename = void>
> struct _Diff
> { using type = typename pointer_traits<_PtrT>::difference_type; };
>
>      template<typename _A2, typename _PtrT>
> struct _Diff<_A2, _PtrT, __void_t<typename _A2::difference_type>>
> { using type = typename _A2::difference_type; };
>
>
>      template<typename _A2, typename _DiffT, typename = void>
> struct _Size : make_unsigned<_DiffT> { };
>
>      template<typename _A2, typename _DiffT>
> struct _Size<_A2, _DiffT, __void_t<typename _A2::size_type>>
> { using type = typename _A2::size_type; };
>
>    public:
>
>
>
>
>
>
>      using const_pointer = typename _Ptr<__c_pointer, const value_type>::type;
>
>
>
>
>
>
>
>      using void_pointer = typename _Ptr<__v_pointer, void>::type;
>
>
>
>
>
>
>
>      using const_void_pointer = typename _Ptr<__cv_pointer, const void>::type;
>
>
>
>
>
>
>
>      using difference_type = typename _Diff<_Alloc, pointer>::type;
>
>
>
>
>
>
>
>      using size_type = typename _Size<_Alloc, difference_type>::type;
>
>
>
>
>
>
>
>      using propagate_on_container_copy_assignment
> = __detected_or_t<false_type, __pocca, _Alloc>;
>
>
>
>
>
>
>
>      using propagate_on_container_move_assignment
> = __detected_or_t<false_type, __pocma, _Alloc>;
>
>
>
>
>
>
>
>      using propagate_on_container_swap
> = __detected_or_t<false_type, __pocs, _Alloc>;
>
>
>
>
>
>
>
>      using is_always_equal
> = __detected_or_t<typename is_empty<_Alloc>::type, __equal, _Alloc>;
>
>      template<typename _Tp>
> using rebind_alloc = __alloc_rebind<_Alloc, _Tp>;
>      template<typename _Tp>
> using rebind_traits = allocator_traits<rebind_alloc<_Tp>>;
>
>    private:
>      template<typename _Alloc2>
> static auto
> _S_allocate(_Alloc2& __a, size_type __n, const_void_pointer __hint, int)
> -> decltype(__a.allocate(__n, __hint))
> { return __a.allocate(__n, __hint); }
>
>      template<typename _Alloc2>
> static pointer
> _S_allocate(_Alloc2& __a, size_type __n, const_void_pointer, ...)
> { return __a.allocate(__n); }
>
>      template<typename _Tp, typename... _Args>
> struct __construct_helper
> {
>   template<typename _Alloc2,
>     typename = decltype(std::declval<_Alloc2*>()->construct(
>    std::declval<_Tp*>(), std::declval<_Args>()...))>
>     static true_type __test(int);
>
>   template<typename>
>     static false_type __test(...);
>
>   using type = decltype(__test<_Alloc>(0));
> };
>
>      template<typename _Tp, typename... _Args>
> using __has_construct
>   = typename __construct_helper<_Tp, _Args...>::type;
>
>      template<typename _Tp, typename... _Args>
> static _Require<__has_construct<_Tp, _Args...>>
> _S_construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
> { __a.construct(__p, std::forward<_Args>(__args)...); }
>
>      template<typename _Tp, typename... _Args>
> static
> _Require<__and_<__not_<__has_construct<_Tp, _Args...>>,
>          is_constructible<_Tp, _Args...>>>
> _S_construct(_Alloc&, _Tp* __p, _Args&&... __args)
> { ::new((void*)__p) _Tp(std::forward<_Args>(__args)...); }
>
>      template<typename _Alloc2, typename _Tp>
> static auto
> _S_destroy(_Alloc2& __a, _Tp* __p, int)
> -> decltype(__a.destroy(__p))
> { __a.destroy(__p); }
>
>      template<typename _Alloc2, typename _Tp>
> static void
> _S_destroy(_Alloc2&, _Tp* __p, ...)
> { __p->~_Tp(); }
>
>      template<typename _Alloc2>
> static auto
> _S_max_size(_Alloc2& __a, int)
> -> decltype(__a.max_size())
> { return __a.max_size(); }
>
>      template<typename _Alloc2>
> static size_type
> _S_max_size(_Alloc2&, ...)
> {
>
>
>   return __gnu_cxx::__numeric_traits<size_type>::__max
>     / sizeof(value_type);
> }
>
>      template<typename _Alloc2>
> static auto
> _S_select(_Alloc2& __a, int)
> -> decltype(__a.select_on_container_copy_construction())
> { return __a.select_on_container_copy_construction(); }
>
>      template<typename _Alloc2>
> static _Alloc2
> _S_select(_Alloc2& __a, ...)
> { return __a; }
>
>    public:
># 299 "/usr/include/c++/8/bits/alloc_traits.h" 3
>      static pointer
>      allocate(_Alloc& __a, size_type __n)
>      { return __a.allocate(__n); }
># 314 "/usr/include/c++/8/bits/alloc_traits.h" 3
>      static pointer
>      allocate(_Alloc& __a, size_type __n, const_void_pointer __hint)
>      { return _S_allocate(__a, __n, __hint, 0); }
># 326 "/usr/include/c++/8/bits/alloc_traits.h" 3
>      static void
>      deallocate(_Alloc& __a, pointer __p, size_type __n)
>      { __a.deallocate(__p, __n); }
># 341 "/usr/include/c++/8/bits/alloc_traits.h" 3
>      template<typename _Tp, typename... _Args>
> static auto construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
> -> decltype(_S_construct(__a, __p, std::forward<_Args>(__args)...))
> { _S_construct(__a, __p, std::forward<_Args>(__args)...); }
># 354 "/usr/include/c++/8/bits/alloc_traits.h" 3
>      template<typename _Tp>
> static void destroy(_Alloc& __a, _Tp* __p)
> { _S_destroy(__a, __p, 0); }
># 366 "/usr/include/c++/8/bits/alloc_traits.h" 3
>      static size_type max_size(const _Alloc& __a) noexcept
>      { return _S_max_size(__a, 0); }
># 377 "/usr/include/c++/8/bits/alloc_traits.h" 3
>      static _Alloc
>      select_on_container_copy_construction(const _Alloc& __rhs)
>      { return _S_select(__rhs, 0); }
>    };
>
>
>  template<typename _Tp>
>    struct allocator_traits<allocator<_Tp>>
>    {
>
>      using allocator_type = allocator<_Tp>;
>
>      using value_type = _Tp;
>
>
>      using pointer = _Tp*;
>
>
>      using const_pointer = const _Tp*;
>
>
>      using void_pointer = void*;
>
>
>      using const_void_pointer = const void*;
>
>
>      using difference_type = std::ptrdiff_t;
>
>
>      using size_type = std::size_t;
>
>
>      using propagate_on_container_copy_assignment = false_type;
>
>
>      using propagate_on_container_move_assignment = true_type;
>
>
>      using propagate_on_container_swap = false_type;
>
>
>      using is_always_equal = true_type;
>
>      template<typename _Up>
> using rebind_alloc = allocator<_Up>;
>
>      template<typename _Up>
> using rebind_traits = allocator_traits<allocator<_Up>>;
># 434 "/usr/include/c++/8/bits/alloc_traits.h" 3
>      static pointer
>      allocate(allocator_type& __a, size_type __n)
>      { return __a.allocate(__n); }
># 448 "/usr/include/c++/8/bits/alloc_traits.h" 3
>      static pointer
>      allocate(allocator_type& __a, size_type __n, const_void_pointer __hint)
>      { return __a.allocate(__n, __hint); }
># 460 "/usr/include/c++/8/bits/alloc_traits.h" 3
>      static void
>      deallocate(allocator_type& __a, pointer __p, size_type __n)
>      { __a.deallocate(__p, __n); }
># 472 "/usr/include/c++/8/bits/alloc_traits.h" 3
>      template<typename _Up, typename... _Args>
> static void
> construct(allocator_type& __a, _Up* __p, _Args&&... __args)
> { __a.construct(__p, std::forward<_Args>(__args)...); }
># 484 "/usr/include/c++/8/bits/alloc_traits.h" 3
>      template<typename _Up>
> static void
> destroy(allocator_type& __a, _Up* __p)
> { __a.destroy(__p); }
>
>
>
>
>
>
>      static size_type
>      max_size(const allocator_type& __a) noexcept
>      { return __a.max_size(); }
>
>
>
>
>
>
>      static allocator_type
>      select_on_container_copy_construction(const allocator_type& __rhs)
>      { return __rhs; }
>    };
>
>
>  template<typename _Alloc>
>    inline void
>    __do_alloc_on_copy(_Alloc& __one, const _Alloc& __two, true_type)
>    { __one = __two; }
>
>  template<typename _Alloc>
>    inline void
>    __do_alloc_on_copy(_Alloc&, const _Alloc&, false_type)
>    { }
>
>  template<typename _Alloc>
>    inline void __alloc_on_copy(_Alloc& __one, const _Alloc& __two)
>    {
>      typedef allocator_traits<_Alloc> __traits;
>      typedef typename __traits::propagate_on_container_copy_assignment __pocca;
>      __do_alloc_on_copy(__one, __two, __pocca());
>    }
>
>  template<typename _Alloc>
>    inline _Alloc __alloc_on_copy(const _Alloc& __a)
>    {
>      typedef allocator_traits<_Alloc> __traits;
>      return __traits::select_on_container_copy_construction(__a);
>    }
>
>  template<typename _Alloc>
>    inline void __do_alloc_on_move(_Alloc& __one, _Alloc& __two, true_type)
>    { __one = std::move(__two); }
>
>  template<typename _Alloc>
>    inline void __do_alloc_on_move(_Alloc&, _Alloc&, false_type)
>    { }
>
>  template<typename _Alloc>
>    inline void __alloc_on_move(_Alloc& __one, _Alloc& __two)
>    {
>      typedef allocator_traits<_Alloc> __traits;
>      typedef typename __traits::propagate_on_container_move_assignment __pocma;
>      __do_alloc_on_move(__one, __two, __pocma());
>    }
>
>  template<typename _Alloc>
>    inline void __do_alloc_on_swap(_Alloc& __one, _Alloc& __two, true_type)
>    {
>      using std::swap;
>      swap(__one, __two);
>    }
>
>  template<typename _Alloc>
>    inline void __do_alloc_on_swap(_Alloc&, _Alloc&, false_type)
>    { }
>
>  template<typename _Alloc>
>    inline void __alloc_on_swap(_Alloc& __one, _Alloc& __two)
>    {
>      typedef allocator_traits<_Alloc> __traits;
>      typedef typename __traits::propagate_on_container_swap __pocs;
>      __do_alloc_on_swap(__one, __two, __pocs());
>    }
>
>  template<typename _Alloc>
>    class __is_copy_insertable_impl
>    {
>      typedef allocator_traits<_Alloc> _Traits;
>
>      template<typename _Up, typename
>        = decltype(_Traits::construct(std::declval<_Alloc&>(),
>          std::declval<_Up*>(),
>          std::declval<const _Up&>()))>
> static true_type
> _M_select(int);
>
>      template<typename _Up>
> static false_type
> _M_select(...);
>
>    public:
>      typedef decltype(_M_select<typename _Alloc::value_type>(0)) type;
>    };
>
>
>  template<typename _Alloc>
>    struct __is_copy_insertable
>    : __is_copy_insertable_impl<_Alloc>::type
>    { };
>
>
>  template<typename _Tp>
>    struct __is_copy_insertable<allocator<_Tp>>
>    : is_copy_constructible<_Tp>
>    { };
>
>
>
>  template<typename _Alloc, typename = void>
>    struct __is_allocator : false_type { };
>
>  template<typename _Alloc>
>    struct __is_allocator<_Alloc,
>      __void_t<typename _Alloc::value_type,
>        decltype(std::declval<_Alloc&>().allocate(size_t{}))>>
>    : true_type { };
>
>  template<typename _Alloc>
>    using _RequireAllocator
>      = typename enable_if<__is_allocator<_Alloc>::value, _Alloc>::type;
>
>
>
>}
># 37 "/usr/include/c++/8/ext/alloc_traits.h" 2 3
>
>
>
>
>namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>
>
>template<typename _Alloc, typename = typename _Alloc::value_type>
>  struct __alloc_traits
>
>  : std::allocator_traits<_Alloc>
>
>  {
>    typedef _Alloc allocator_type;
>
>    typedef std::allocator_traits<_Alloc> _Base_type;
>    typedef typename _Base_type::value_type value_type;
>    typedef typename _Base_type::pointer pointer;
>    typedef typename _Base_type::const_pointer const_pointer;
>    typedef typename _Base_type::size_type size_type;
>    typedef typename _Base_type::difference_type difference_type;
>
>    typedef value_type& reference;
>    typedef const value_type& const_reference;
>    using _Base_type::allocate;
>    using _Base_type::deallocate;
>    using _Base_type::construct;
>    using _Base_type::destroy;
>    using _Base_type::max_size;
>
>  private:
>    template<typename _Ptr>
>      using __is_custom_pointer
> = std::__and_<std::is_same<pointer, _Ptr>,
>        std::__not_<std::is_pointer<_Ptr>>>;
>
>  public:
>
>    template<typename _Ptr, typename... _Args>
>      static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
>      construct(_Alloc& __a, _Ptr __p, _Args&&... __args)
>      {
> _Base_type::construct(__a, std::__to_address(__p),
>         std::forward<_Args>(__args)...);
>      }
>
>
>    template<typename _Ptr>
>      static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
>      destroy(_Alloc& __a, _Ptr __p)
>      { _Base_type::destroy(__a, std::__to_address(__p)); }
>
>    static _Alloc _S_select_on_copy(const _Alloc& __a)
>    { return _Base_type::select_on_container_copy_construction(__a); }
>
>    static void _S_on_swap(_Alloc& __a, _Alloc& __b)
>    { std::__alloc_on_swap(__a, __b); }
>
>    static constexpr bool _S_propagate_on_copy_assign()
>    { return _Base_type::propagate_on_container_copy_assignment::value; }
>
>    static constexpr bool _S_propagate_on_move_assign()
>    { return _Base_type::propagate_on_container_move_assignment::value; }
>
>    static constexpr bool _S_propagate_on_swap()
>    { return _Base_type::propagate_on_container_swap::value; }
>
>    static constexpr bool _S_always_equal()
>    { return _Base_type::is_always_equal::value; }
>
>    static constexpr bool _S_nothrow_move()
>    { return _S_propagate_on_move_assign() || _S_always_equal(); }
>
>    template<typename _Tp>
>      struct rebind
>      { typedef typename _Base_type::template rebind_alloc<_Tp> other; };
># 158 "/usr/include/c++/8/ext/alloc_traits.h" 3
>  };
>
>
>}
># 41 "/usr/include/c++/8/bits/basic_string.h" 2 3
># 52 "/usr/include/c++/8/bits/basic_string.h" 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>namespace __cxx11 {
># 76 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    class basic_string
>    {
>      typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
> rebind<_CharT>::other _Char_alloc_type;
>      typedef __gnu_cxx::__alloc_traits<_Char_alloc_type> _Alloc_traits;
>
>
>    public:
>      typedef _Traits traits_type;
>      typedef typename _Traits::char_type value_type;
>      typedef _Char_alloc_type allocator_type;
>      typedef typename _Alloc_traits::size_type size_type;
>      typedef typename _Alloc_traits::difference_type difference_type;
>      typedef typename _Alloc_traits::reference reference;
>      typedef typename _Alloc_traits::const_reference const_reference;
>      typedef typename _Alloc_traits::pointer pointer;
>      typedef typename _Alloc_traits::const_pointer const_pointer;
>      typedef __gnu_cxx::__normal_iterator<pointer, basic_string> iterator;
>      typedef __gnu_cxx::__normal_iterator<const_pointer, basic_string>
>       const_iterator;
>      typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
>      typedef std::reverse_iterator<iterator> reverse_iterator;
>
>
>      static const size_type npos = static_cast<size_type>(-1);
>
>    private:
>
>
>
>
>      typedef const_iterator __const_iterator;
># 139 "/usr/include/c++/8/bits/basic_string.h" 3
>      struct _Alloc_hider : allocator_type
>      {
>
>
>
>
> _Alloc_hider(pointer __dat, const _Alloc& __a)
> : allocator_type(__a), _M_p(__dat) { }
>
> _Alloc_hider(pointer __dat, _Alloc&& __a = _Alloc())
> : allocator_type(std::move(__a)), _M_p(__dat) { }
>
>
> pointer _M_p;
>      };
>
>      _Alloc_hider _M_dataplus;
>      size_type _M_string_length;
>
>      enum { _S_local_capacity = 15 / sizeof(_CharT) };
>
>      union
>      {
> _CharT _M_local_buf[_S_local_capacity + 1];
> size_type _M_allocated_capacity;
>      };
>
>      void
>      _M_data(pointer __p)
>      { _M_dataplus._M_p = __p; }
>
>      void
>      _M_length(size_type __length)
>      { _M_string_length = __length; }
>
>      pointer
>      _M_data() const
>      { return _M_dataplus._M_p; }
>
>      pointer
>      _M_local_data()
>      {
>
> return std::pointer_traits<pointer>::pointer_to(*_M_local_buf);
>
>
>
>      }
>
>      const_pointer
>      _M_local_data() const
>      {
>
> return std::pointer_traits<const_pointer>::pointer_to(*_M_local_buf);
>
>
>
>      }
>
>      void
>      _M_capacity(size_type __capacity)
>      { _M_allocated_capacity = __capacity; }
>
>      void
>      _M_set_length(size_type __n)
>      {
> _M_length(__n);
> traits_type::assign(_M_data()[__n], _CharT());
>      }
>
>      bool
>      _M_is_local() const
>      { return _M_data() == _M_local_data(); }
>
>
>      pointer
>      _M_create(size_type&, size_type);
>
>      void
>      _M_dispose()
>      {
> if (!_M_is_local())
>   _M_destroy(_M_allocated_capacity);
>      }
>
>      void
>      _M_destroy(size_type __size) throw()
>      { _Alloc_traits::deallocate(_M_get_allocator(), _M_data(), __size + 1); }
>
>
>
>      template<typename _InIterator>
>        void
>        _M_construct_aux(_InIterator __beg, _InIterator __end,
>    std::__false_type)
> {
>          typedef typename iterator_traits<_InIterator>::iterator_category _Tag;
>          _M_construct(__beg, __end, _Tag());
> }
>
>
>
>      template<typename _Integer>
>        void
>        _M_construct_aux(_Integer __beg, _Integer __end, std::__true_type)
> { _M_construct_aux_2(static_cast<size_type>(__beg), __end); }
>
>      void
>      _M_construct_aux_2(size_type __req, _CharT __c)
>      { _M_construct(__req, __c); }
>
>      template<typename _InIterator>
>        void
>        _M_construct(_InIterator __beg, _InIterator __end)
> {
>   typedef typename std::__is_integer<_InIterator>::__type _Integral;
>   _M_construct_aux(__beg, __end, _Integral());
>        }
>
>
>      template<typename _InIterator>
>        void
>        _M_construct(_InIterator __beg, _InIterator __end,
>       std::input_iterator_tag);
>
>
>
>      template<typename _FwdIterator>
>        void
>        _M_construct(_FwdIterator __beg, _FwdIterator __end,
>       std::forward_iterator_tag);
>
>      void
>      _M_construct(size_type __req, _CharT __c);
>
>      allocator_type&
>      _M_get_allocator()
>      { return _M_dataplus; }
>
>      const allocator_type&
>      _M_get_allocator() const
>      { return _M_dataplus; }
>
>    private:
># 298 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      _M_check(size_type __pos, const char* __s) const
>      {
> if (__pos > this->size())
>   __throw_out_of_range_fmt(("%s: __pos (which is %zu) > " "this->size() (which is %zu)")
>                                         ,
>       __s, __pos, this->size());
> return __pos;
>      }
>
>      void
>      _M_check_length(size_type __n1, size_type __n2, const char* __s) const
>      {
> if (this->max_size() - (this->size() - __n1) < __n2)
>   __throw_length_error((__s));
>      }
>
>
>
>      size_type
>      _M_limit(size_type __pos, size_type __off) const noexcept
>      {
> const bool __testoff = __off < this->size() - __pos;
> return __testoff ? __off : this->size() - __pos;
>      }
>
>
>      bool
>      _M_disjunct(const _CharT* __s) const noexcept
>      {
> return (less<const _CharT*>()(__s, _M_data())
>  || less<const _CharT*>()(_M_data() + this->size(), __s));
>      }
>
>
>
>      static void
>      _S_copy(_CharT* __d, const _CharT* __s, size_type __n)
>      {
> if (__n == 1)
>   traits_type::assign(*__d, *__s);
> else
>   traits_type::copy(__d, __s, __n);
>      }
>
>      static void
>      _S_move(_CharT* __d, const _CharT* __s, size_type __n)
>      {
> if (__n == 1)
>   traits_type::assign(*__d, *__s);
> else
>   traits_type::move(__d, __s, __n);
>      }
>
>      static void
>      _S_assign(_CharT* __d, size_type __n, _CharT __c)
>      {
> if (__n == 1)
>   traits_type::assign(*__d, __c);
> else
>   traits_type::assign(__d, __n, __c);
>      }
>
>
>
>      template<class _Iterator>
>        static void
>        _S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2)
>        {
>   for (; __k1 != __k2; ++__k1, (void)++__p)
>     traits_type::assign(*__p, *__k1);
> }
>
>      static void
>      _S_copy_chars(_CharT* __p, iterator __k1, iterator __k2) noexcept
>      { _S_copy_chars(__p, __k1.base(), __k2.base()); }
>
>      static void
>      _S_copy_chars(_CharT* __p, const_iterator __k1, const_iterator __k2)
>      noexcept
>      { _S_copy_chars(__p, __k1.base(), __k2.base()); }
>
>      static void
>      _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2) noexcept
>      { _S_copy(__p, __k1, __k2 - __k1); }
>
>      static void
>      _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2)
>      noexcept
>      { _S_copy(__p, __k1, __k2 - __k1); }
>
>      static int
>      _S_compare(size_type __n1, size_type __n2) noexcept
>      {
> const difference_type __d = difference_type(__n1 - __n2);
>
> if (__d > __gnu_cxx::__numeric_traits<int>::__max)
>   return __gnu_cxx::__numeric_traits<int>::__max;
> else if (__d < __gnu_cxx::__numeric_traits<int>::__min)
>   return __gnu_cxx::__numeric_traits<int>::__min;
> else
>   return int(__d);
>      }
>
>      void
>      _M_assign(const basic_string&);
>
>      void
>      _M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
>  size_type __len2);
>
>      void
>      _M_erase(size_type __pos, size_type __n);
>
>    public:
>
>
>
>
>
>
>
>      basic_string()
>      noexcept(is_nothrow_default_constructible<_Alloc>::value)
>      : _M_dataplus(_M_local_data())
>      { _M_set_length(0); }
>
>
>
>
>      explicit
>      basic_string(const _Alloc& __a) noexcept
>      : _M_dataplus(_M_local_data(), __a)
>      { _M_set_length(0); }
>
>
>
>
>
>      basic_string(const basic_string& __str)
>      : _M_dataplus(_M_local_data(),
>      _Alloc_traits::_S_select_on_copy(__str._M_get_allocator()))
>      { _M_construct(__str._M_data(), __str._M_data() + __str.length()); }
># 450 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string(const basic_string& __str, size_type __pos,
>     const _Alloc& __a = _Alloc())
>      : _M_dataplus(_M_local_data(), __a)
>      {
> const _CharT* __start = __str._M_data()
>   + __str._M_check(__pos, "basic_string::basic_string");
> _M_construct(__start, __start + __str._M_limit(__pos, npos));
>      }
>
>
>
>
>
>
>
>      basic_string(const basic_string& __str, size_type __pos,
>     size_type __n)
>      : _M_dataplus(_M_local_data())
>      {
> const _CharT* __start = __str._M_data()
>   + __str._M_check(__pos, "basic_string::basic_string");
> _M_construct(__start, __start + __str._M_limit(__pos, __n));
>      }
># 481 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string(const basic_string& __str, size_type __pos,
>     size_type __n, const _Alloc& __a)
>      : _M_dataplus(_M_local_data(), __a)
>      {
> const _CharT* __start
>   = __str._M_data() + __str._M_check(__pos, "string::string");
> _M_construct(__start, __start + __str._M_limit(__pos, __n));
>      }
># 499 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string(const _CharT* __s, size_type __n,
>     const _Alloc& __a = _Alloc())
>      : _M_dataplus(_M_local_data(), __a)
>      { _M_construct(__s, __s + __n); }
>
>
>
>
>
>
>      basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
>      : _M_dataplus(_M_local_data(), __a)
>      { _M_construct(__s, __s ? __s + traits_type::length(__s) : __s+npos); }
>
>
>
>
>
>
>
>      basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
>      : _M_dataplus(_M_local_data(), __a)
>      { _M_construct(__n, __c); }
># 531 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string(basic_string&& __str) noexcept
>      : _M_dataplus(_M_local_data(), std::move(__str._M_get_allocator()))
>      {
> if (__str._M_is_local())
>   {
>     traits_type::copy(_M_local_buf, __str._M_local_buf,
>         _S_local_capacity + 1);
>   }
> else
>   {
>     _M_data(__str._M_data());
>     _M_capacity(__str._M_allocated_capacity);
>   }
>
>
>
>
> _M_length(__str.length());
> __str._M_data(__str._M_local_data());
> __str._M_set_length(0);
>      }
>
>
>
>
>
>
>      basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
>      : _M_dataplus(_M_local_data(), __a)
>      { _M_construct(__l.begin(), __l.end()); }
>
>      basic_string(const basic_string& __str, const _Alloc& __a)
>      : _M_dataplus(_M_local_data(), __a)
>      { _M_construct(__str.begin(), __str.end()); }
>
>      basic_string(basic_string&& __str, const _Alloc& __a)
>      noexcept(_Alloc_traits::_S_always_equal())
>      : _M_dataplus(_M_local_data(), __a)
>      {
> if (__str._M_is_local())
>   {
>     traits_type::copy(_M_local_buf, __str._M_local_buf,
>         _S_local_capacity + 1);
>     _M_length(__str.length());
>     __str._M_set_length(0);
>   }
> else if (_Alloc_traits::_S_always_equal()
>     || __str.get_allocator() == __a)
>   {
>     _M_data(__str._M_data());
>     _M_length(__str.length());
>     _M_capacity(__str._M_allocated_capacity);
>     __str._M_data(__str._M_local_buf);
>     __str._M_set_length(0);
>   }
> else
>   _M_construct(__str.begin(), __str.end());
>      }
># 599 "/usr/include/c++/8/bits/basic_string.h" 3
>      template<typename _InputIterator,
>        typename = std::_RequireInputIter<_InputIterator>>
>
>
>
>        basic_string(_InputIterator __beg, _InputIterator __end,
>       const _Alloc& __a = _Alloc())
> : _M_dataplus(_M_local_data(), __a)
> { _M_construct(__beg, __end); }
># 646 "/usr/include/c++/8/bits/basic_string.h" 3
>      ~basic_string()
>      { _M_dispose(); }
>
>
>
>
>
>      basic_string&
>      operator=(const basic_string& __str)
>      {
>
> if (_Alloc_traits::_S_propagate_on_copy_assign())
>   {
>     if (!_Alloc_traits::_S_always_equal() && !_M_is_local()
>  && _M_get_allocator() != __str._M_get_allocator())
>       {
>
>
>  if (__str.size() <= _S_local_capacity)
>    {
>      _M_destroy(_M_allocated_capacity);
>      _M_data(_M_local_data());
>      _M_set_length(0);
>    }
>  else
>    {
>      const auto __len = __str.size();
>      auto __alloc = __str._M_get_allocator();
>
>      auto __ptr = _Alloc_traits::allocate(__alloc, __len + 1);
>      _M_destroy(_M_allocated_capacity);
>      _M_data(__ptr);
>      _M_capacity(__len);
>      _M_set_length(__len);
>    }
>       }
>     std::__alloc_on_copy(_M_get_allocator(), __str._M_get_allocator());
>   }
>
> return this->assign(__str);
>      }
>
>
>
>
>
>      basic_string&
>      operator=(const _CharT* __s)
>      { return this->assign(__s); }
># 703 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      operator=(_CharT __c)
>      {
> this->assign(1, __c);
> return *this;
>      }
># 721 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      operator=(basic_string&& __str)
>      noexcept(_Alloc_traits::_S_nothrow_move())
>      {
> if (!_M_is_local() && _Alloc_traits::_S_propagate_on_move_assign()
>     && !_Alloc_traits::_S_always_equal()
>     && _M_get_allocator() != __str._M_get_allocator())
>   {
>
>     _M_destroy(_M_allocated_capacity);
>     _M_data(_M_local_data());
>     _M_set_length(0);
>   }
>
> std::__alloc_on_move(_M_get_allocator(), __str._M_get_allocator());
>
> if (!__str._M_is_local()
>     && (_Alloc_traits::_S_propagate_on_move_assign()
>       || _Alloc_traits::_S_always_equal()))
>   {
>     pointer __data = nullptr;
>     size_type __capacity;
>     if (!_M_is_local())
>       {
>  if (_Alloc_traits::_S_always_equal())
>    {
>      __data = _M_data();
>      __capacity = _M_allocated_capacity;
>    }
>  else
>    _M_destroy(_M_allocated_capacity);
>       }
>
>     _M_data(__str._M_data());
>     _M_length(__str.length());
>     _M_capacity(__str._M_allocated_capacity);
>     if (__data)
>       {
>  __str._M_data(__data);
>  __str._M_capacity(__capacity);
>       }
>     else
>       __str._M_data(__str._M_local_buf);
>   }
> else
>     assign(__str);
> __str.clear();
> return *this;
>      }
>
>
>
>
>
>      basic_string&
>      operator=(initializer_list<_CharT> __l)
>      {
> this->assign(__l.begin(), __l.size());
> return *this;
>      }
># 806 "/usr/include/c++/8/bits/basic_string.h" 3
>      iterator
>      begin() noexcept
>      { return iterator(_M_data()); }
>
>
>
>
>
>      const_iterator
>      begin() const noexcept
>      { return const_iterator(_M_data()); }
>
>
>
>
>
>      iterator
>      end() noexcept
>      { return iterator(_M_data() + this->size()); }
>
>
>
>
>
>      const_iterator
>      end() const noexcept
>      { return const_iterator(_M_data() + this->size()); }
>
>
>
>
>
>
>      reverse_iterator
>      rbegin() noexcept
>      { return reverse_iterator(this->end()); }
>
>
>
>
>
>
>      const_reverse_iterator
>      rbegin() const noexcept
>      { return const_reverse_iterator(this->end()); }
>
>
>
>
>
>
>      reverse_iterator
>      rend() noexcept
>      { return reverse_iterator(this->begin()); }
>
>
>
>
>
>
>      const_reverse_iterator
>      rend() const noexcept
>      { return const_reverse_iterator(this->begin()); }
>
>
>
>
>
>
>      const_iterator
>      cbegin() const noexcept
>      { return const_iterator(this->_M_data()); }
>
>
>
>
>
>      const_iterator
>      cend() const noexcept
>      { return const_iterator(this->_M_data() + this->size()); }
>
>
>
>
>
>
>      const_reverse_iterator
>      crbegin() const noexcept
>      { return const_reverse_iterator(this->end()); }
>
>
>
>
>
>
>      const_reverse_iterator
>      crend() const noexcept
>      { return const_reverse_iterator(this->begin()); }
>
>
>    public:
>
>
>
>      size_type
>      size() const noexcept
>      { return _M_string_length; }
>
>
>
>      size_type
>      length() const noexcept
>      { return _M_string_length; }
>
>
>      size_type
>      max_size() const noexcept
>      { return (_Alloc_traits::max_size(_M_get_allocator()) - 1) / 2; }
># 935 "/usr/include/c++/8/bits/basic_string.h" 3
>      void
>      resize(size_type __n, _CharT __c);
># 948 "/usr/include/c++/8/bits/basic_string.h" 3
>      void
>      resize(size_type __n)
>      { this->resize(__n, _CharT()); }
>
>
>
>      void
>      shrink_to_fit() noexcept
>      {
>
> if (capacity() > size())
>   {
>     try
>       { reserve(0); }
>     catch(...)
>       { }
>   }
>
>      }
>
>
>
>
>
>
>      size_type
>      capacity() const noexcept
>      {
> return _M_is_local() ? size_type(_S_local_capacity)
>                      : _M_allocated_capacity;
>      }
># 997 "/usr/include/c++/8/bits/basic_string.h" 3
>      void
>      reserve(size_type __res_arg = 0);
>
>
>
>
>      void
>      clear() noexcept
>      { _M_set_length(0); }
>
>
>
>
>
>      bool
>      empty() const noexcept
>      { return this->size() == 0; }
># 1026 "/usr/include/c++/8/bits/basic_string.h" 3
>      const_reference
>      operator[] (size_type __pos) const noexcept
>      {
> ;
> return _M_data()[__pos];
>      }
># 1043 "/usr/include/c++/8/bits/basic_string.h" 3
>      reference
>      operator[](size_type __pos)
>      {
>
>
> ;
>
> ;
> return _M_data()[__pos];
>      }
># 1064 "/usr/include/c++/8/bits/basic_string.h" 3
>      const_reference
>      at(size_type __n) const
>      {
> if (__n >= this->size())
>   __throw_out_of_range_fmt(("basic_string::at: __n " "(which is %zu) >= this->size() " "(which is %zu)")
>
>                            ,
>       __n, this->size());
> return _M_data()[__n];
>      }
># 1085 "/usr/include/c++/8/bits/basic_string.h" 3
>      reference
>      at(size_type __n)
>      {
> if (__n >= size())
>   __throw_out_of_range_fmt(("basic_string::at: __n " "(which is %zu) >= this->size() " "(which is %zu)")
>
>                            ,
>       __n, this->size());
> return _M_data()[__n];
>      }
>
>
>
>
>
>
>      reference
>      front() noexcept
>      {
> ;
> return operator[](0);
>      }
>
>
>
>
>
>      const_reference
>      front() const noexcept
>      {
> ;
> return operator[](0);
>      }
>
>
>
>
>
>      reference
>      back() noexcept
>      {
> ;
> return operator[](this->size() - 1);
>      }
>
>
>
>
>
>      const_reference
>      back() const noexcept
>      {
> ;
> return operator[](this->size() - 1);
>      }
># 1148 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      operator+=(const basic_string& __str)
>      { return this->append(__str); }
>
>
>
>
>
>
>      basic_string&
>      operator+=(const _CharT* __s)
>      { return this->append(__s); }
>
>
>
>
>
>
>      basic_string&
>      operator+=(_CharT __c)
>      {
> this->push_back(__c);
> return *this;
>      }
>
>
>
>
>
>
>
>      basic_string&
>      operator+=(initializer_list<_CharT> __l)
>      { return this->append(__l.begin(), __l.size()); }
># 1201 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      append(const basic_string& __str)
>      { return _M_append(__str._M_data(), __str.size()); }
># 1218 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      append(const basic_string& __str, size_type __pos, size_type __n)
>      { return _M_append(__str._M_data()
>    + __str._M_check(__pos, "basic_string::append"),
>    __str._M_limit(__pos, __n)); }
>
>
>
>
>
>
>
>      basic_string&
>      append(const _CharT* __s, size_type __n)
>      {
> ;
> _M_check_length(size_type(0), __n, "basic_string::append");
> return _M_append(__s, __n);
>      }
>
>
>
>
>
>
>      basic_string&
>      append(const _CharT* __s)
>      {
> ;
> const size_type __n = traits_type::length(__s);
> _M_check_length(size_type(0), __n, "basic_string::append");
> return _M_append(__s, __n);
>      }
># 1260 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      append(size_type __n, _CharT __c)
>      { return _M_replace_aux(this->size(), size_type(0), __n, __c); }
>
>
>
>
>
>
>
>      basic_string&
>      append(initializer_list<_CharT> __l)
>      { return this->append(__l.begin(), __l.size()); }
># 1284 "/usr/include/c++/8/bits/basic_string.h" 3
>      template<class _InputIterator,
>        typename = std::_RequireInputIter<_InputIterator>>
>
>
>
>        basic_string&
>        append(_InputIterator __first, _InputIterator __last)
>        { return this->replace(end(), end(), __first, __last); }
># 1329 "/usr/include/c++/8/bits/basic_string.h" 3
>      void
>      push_back(_CharT __c)
>      {
> const size_type __size = this->size();
> if (__size + 1 > this->capacity())
>   this->_M_mutate(__size, size_type(0), 0, size_type(1));
> traits_type::assign(this->_M_data()[__size], __c);
> this->_M_set_length(__size + 1);
>      }
>
>
>
>
>
>
>      basic_string&
>      assign(const basic_string& __str)
>      {
> this->_M_assign(__str);
> return *this;
>      }
># 1360 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      assign(basic_string&& __str)
>      noexcept(_Alloc_traits::_S_nothrow_move())
>      {
>
>
> return *this = std::move(__str);
>      }
># 1383 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      assign(const basic_string& __str, size_type __pos, size_type __n)
>      { return _M_replace(size_type(0), this->size(), __str._M_data()
>     + __str._M_check(__pos, "basic_string::assign"),
>     __str._M_limit(__pos, __n)); }
># 1399 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      assign(const _CharT* __s, size_type __n)
>      {
> ;
> return _M_replace(size_type(0), this->size(), __s, __n);
>      }
># 1415 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      assign(const _CharT* __s)
>      {
> ;
> return _M_replace(size_type(0), this->size(), __s,
>     traits_type::length(__s));
>      }
># 1432 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      assign(size_type __n, _CharT __c)
>      { return _M_replace_aux(size_type(0), this->size(), __n, __c); }
># 1445 "/usr/include/c++/8/bits/basic_string.h" 3
>      template<class _InputIterator,
>        typename = std::_RequireInputIter<_InputIterator>>
>
>
>
>        basic_string&
>        assign(_InputIterator __first, _InputIterator __last)
>        { return this->replace(begin(), end(), __first, __last); }
>
>
>
>
>
>
>
>      basic_string&
>      assign(initializer_list<_CharT> __l)
>      { return this->assign(__l.begin(), __l.size()); }
># 1513 "/usr/include/c++/8/bits/basic_string.h" 3
>      iterator
>      insert(const_iterator __p, size_type __n, _CharT __c)
>      {
> ;
> const size_type __pos = __p - begin();
> this->replace(__p, __p, __n, __c);
> return iterator(this->_M_data() + __pos);
>      }
># 1555 "/usr/include/c++/8/bits/basic_string.h" 3
>      template<class _InputIterator,
>        typename = std::_RequireInputIter<_InputIterator>>
> iterator
>        insert(const_iterator __p, _InputIterator __beg, _InputIterator __end)
>        {
>   ;
>   const size_type __pos = __p - begin();
>   this->replace(__p, __p, __beg, __end);
>   return iterator(this->_M_data() + __pos);
> }
># 1591 "/usr/include/c++/8/bits/basic_string.h" 3
>      void
>      insert(iterator __p, initializer_list<_CharT> __l)
>      {
> ;
> this->insert(__p - begin(), __l.begin(), __l.size());
>      }
># 1611 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      insert(size_type __pos1, const basic_string& __str)
>      { return this->replace(__pos1, size_type(0),
>        __str._M_data(), __str.size()); }
># 1634 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      insert(size_type __pos1, const basic_string& __str,
>      size_type __pos2, size_type __n)
>      { return this->replace(__pos1, size_type(0), __str._M_data()
>        + __str._M_check(__pos2, "basic_string::insert"),
>        __str._M_limit(__pos2, __n)); }
># 1657 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      insert(size_type __pos, const _CharT* __s, size_type __n)
>      { return this->replace(__pos, size_type(0), __s, __n); }
># 1676 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      insert(size_type __pos, const _CharT* __s)
>      {
> ;
> return this->replace(__pos, size_type(0), __s,
>        traits_type::length(__s));
>      }
># 1700 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      insert(size_type __pos, size_type __n, _CharT __c)
>      { return _M_replace_aux(_M_check(__pos, "basic_string::insert"),
>         size_type(0), __n, __c); }
># 1718 "/usr/include/c++/8/bits/basic_string.h" 3
>      iterator
>      insert(__const_iterator __p, _CharT __c)
>      {
> ;
> const size_type __pos = __p - begin();
> _M_replace_aux(__pos, size_type(0), size_type(1), __c);
> return iterator(_M_data() + __pos);
>      }
># 1778 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      erase(size_type __pos = 0, size_type __n = npos)
>      {
> _M_check(__pos, "basic_string::erase");
> if (__n == npos)
>   this->_M_set_length(__pos);
> else if (__n != 0)
>   this->_M_erase(__pos, _M_limit(__pos, __n));
> return *this;
>      }
># 1797 "/usr/include/c++/8/bits/basic_string.h" 3
>      iterator
>      erase(__const_iterator __position)
>      {
>
>                           ;
> const size_type __pos = __position - begin();
> this->_M_erase(__pos, size_type(1));
> return iterator(_M_data() + __pos);
>      }
># 1816 "/usr/include/c++/8/bits/basic_string.h" 3
>      iterator
>      erase(__const_iterator __first, __const_iterator __last)
>      {
>
>                        ;
>        const size_type __pos = __first - begin();
> if (__last == end())
>   this->_M_set_length(__pos);
> else
>   this->_M_erase(__pos, __last - __first);
> return iterator(this->_M_data() + __pos);
>      }
>
>
>
>
>
>
>
>      void
>      pop_back() noexcept
>      {
> ;
> _M_erase(size() - 1, 1);
>      }
># 1860 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      replace(size_type __pos, size_type __n, const basic_string& __str)
>      { return this->replace(__pos, __n, __str._M_data(), __str.size()); }
># 1882 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      replace(size_type __pos1, size_type __n1, const basic_string& __str,
>       size_type __pos2, size_type __n2)
>      { return this->replace(__pos1, __n1, __str._M_data()
>        + __str._M_check(__pos2, "basic_string::replace"),
>        __str._M_limit(__pos2, __n2)); }
># 1907 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      replace(size_type __pos, size_type __n1, const _CharT* __s,
>       size_type __n2)
>      {
> ;
> return _M_replace(_M_check(__pos, "basic_string::replace"),
>     _M_limit(__pos, __n1), __s, __n2);
>      }
># 1932 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      replace(size_type __pos, size_type __n1, const _CharT* __s)
>      {
> ;
> return this->replace(__pos, __n1, __s, traits_type::length(__s));
>      }
># 1956 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      replace(size_type __pos, size_type __n1, size_type __n2, _CharT __c)
>      { return _M_replace_aux(_M_check(__pos, "basic_string::replace"),
>         _M_limit(__pos, __n1), __n2, __c); }
># 1974 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      replace(__const_iterator __i1, __const_iterator __i2,
>       const basic_string& __str)
>      { return this->replace(__i1, __i2, __str._M_data(), __str.size()); }
># 1994 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      replace(__const_iterator __i1, __const_iterator __i2,
>       const _CharT* __s, size_type __n)
>      {
>
>                      ;
> return this->replace(__i1 - begin(), __i2 - __i1, __s, __n);
>      }
># 2016 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      replace(__const_iterator __i1, __const_iterator __i2, const _CharT* __s)
>      {
> ;
> return this->replace(__i1, __i2, __s, traits_type::length(__s));
>      }
># 2037 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      replace(__const_iterator __i1, __const_iterator __i2, size_type __n,
>       _CharT __c)
>      {
>
>                      ;
> return _M_replace_aux(__i1 - begin(), __i2 - __i1, __n, __c);
>      }
># 2062 "/usr/include/c++/8/bits/basic_string.h" 3
>      template<class _InputIterator,
>        typename = std::_RequireInputIter<_InputIterator>>
>        basic_string&
>        replace(const_iterator __i1, const_iterator __i2,
>  _InputIterator __k1, _InputIterator __k2)
>        {
>  
>                        ;
>   ;
>   return this->_M_replace_dispatch(__i1, __i2, __k1, __k2,
>        std::__false_type());
> }
># 2094 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string&
>      replace(__const_iterator __i1, __const_iterator __i2,
>       _CharT* __k1, _CharT* __k2)
>      {
>
>                      ;
> ;
> return this->replace(__i1 - begin(), __i2 - __i1,
>        __k1, __k2 - __k1);
>      }
>
>      basic_string&
>      replace(__const_iterator __i1, __const_iterator __i2,
>       const _CharT* __k1, const _CharT* __k2)
>      {
>
>                      ;
> ;
> return this->replace(__i1 - begin(), __i2 - __i1,
>        __k1, __k2 - __k1);
>      }
>
>      basic_string&
>      replace(__const_iterator __i1, __const_iterator __i2,
>       iterator __k1, iterator __k2)
>      {
>
>                      ;
> ;
> return this->replace(__i1 - begin(), __i2 - __i1,
>        __k1.base(), __k2 - __k1);
>      }
>
>      basic_string&
>      replace(__const_iterator __i1, __const_iterator __i2,
>       const_iterator __k1, const_iterator __k2)
>      {
>
>                      ;
> ;
> return this->replace(__i1 - begin(), __i2 - __i1,
>        __k1.base(), __k2 - __k1);
>      }
># 2153 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string& replace(const_iterator __i1, const_iterator __i2,
>       initializer_list<_CharT> __l)
>      { return this->replace(__i1, __i2, __l.begin(), __l.size()); }
># 2212 "/usr/include/c++/8/bits/basic_string.h" 3
>    private:
>      template<class _Integer>
> basic_string&
> _M_replace_dispatch(const_iterator __i1, const_iterator __i2,
>       _Integer __n, _Integer __val, __true_type)
>        { return _M_replace_aux(__i1 - begin(), __i2 - __i1, __n, __val); }
>
>      template<class _InputIterator>
> basic_string&
> _M_replace_dispatch(const_iterator __i1, const_iterator __i2,
>       _InputIterator __k1, _InputIterator __k2,
>       __false_type);
>
>      basic_string&
>      _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
>       _CharT __c);
>
>      basic_string&
>      _M_replace(size_type __pos, size_type __len1, const _CharT* __s,
>   const size_type __len2);
>
>      basic_string&
>      _M_append(const _CharT* __s, size_type __n);
>
>    public:
># 2250 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      copy(_CharT* __s, size_type __n, size_type __pos = 0) const;
># 2260 "/usr/include/c++/8/bits/basic_string.h" 3
>      void
>      swap(basic_string& __s) noexcept;
># 2270 "/usr/include/c++/8/bits/basic_string.h" 3
>      const _CharT*
>      c_str() const noexcept
>      { return _M_data(); }
># 2282 "/usr/include/c++/8/bits/basic_string.h" 3
>      const _CharT*
>      data() const noexcept
>      { return _M_data(); }
># 2301 "/usr/include/c++/8/bits/basic_string.h" 3
>      allocator_type
>      get_allocator() const noexcept
>      { return _M_get_allocator(); }
># 2317 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find(const _CharT* __s, size_type __pos, size_type __n) const
>      noexcept;
># 2331 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find(const basic_string& __str, size_type __pos = 0) const
>      noexcept
>      { return this->find(__str.data(), __pos, __str.size()); }
># 2363 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find(const _CharT* __s, size_type __pos = 0) const noexcept
>      {
> ;
> return this->find(__s, __pos, traits_type::length(__s));
>      }
># 2380 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find(_CharT __c, size_type __pos = 0) const noexcept;
># 2393 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      rfind(const basic_string& __str, size_type __pos = npos) const
>      noexcept
>      { return this->rfind(__str.data(), __pos, __str.size()); }
># 2427 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      rfind(const _CharT* __s, size_type __pos, size_type __n) const
>      noexcept;
># 2441 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      rfind(const _CharT* __s, size_type __pos = npos) const
>      {
> ;
> return this->rfind(__s, __pos, traits_type::length(__s));
>      }
># 2458 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      rfind(_CharT __c, size_type __pos = npos) const noexcept;
># 2472 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_first_of(const basic_string& __str, size_type __pos = 0) const
>      noexcept
>      { return this->find_first_of(__str.data(), __pos, __str.size()); }
># 2507 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
>      noexcept;
># 2521 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_first_of(const _CharT* __s, size_type __pos = 0) const
>      noexcept
>      {
> ;
> return this->find_first_of(__s, __pos, traits_type::length(__s));
>      }
># 2541 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_first_of(_CharT __c, size_type __pos = 0) const noexcept
>      { return this->find(__c, __pos); }
># 2556 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_last_of(const basic_string& __str, size_type __pos = npos) const
>      noexcept
>      { return this->find_last_of(__str.data(), __pos, __str.size()); }
># 2591 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
>      noexcept;
># 2605 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_last_of(const _CharT* __s, size_type __pos = npos) const
>      noexcept
>      {
> ;
> return this->find_last_of(__s, __pos, traits_type::length(__s));
>      }
># 2625 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_last_of(_CharT __c, size_type __pos = npos) const noexcept
>      { return this->rfind(__c, __pos); }
># 2639 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_first_not_of(const basic_string& __str, size_type __pos = 0) const
>      noexcept
>      { return this->find_first_not_of(__str.data(), __pos, __str.size()); }
># 2674 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_first_not_of(const _CharT* __s, size_type __pos,
>   size_type __n) const noexcept;
># 2688 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_first_not_of(const _CharT* __s, size_type __pos = 0) const
>      noexcept
>      {
> ;
> return this->find_first_not_of(__s, __pos, traits_type::length(__s));
>      }
># 2706 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_first_not_of(_CharT __c, size_type __pos = 0) const
>      noexcept;
># 2721 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_last_not_of(const basic_string& __str, size_type __pos = npos) const
>      noexcept
>      { return this->find_last_not_of(__str.data(), __pos, __str.size()); }
># 2756 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_last_not_of(const _CharT* __s, size_type __pos,
>         size_type __n) const noexcept;
># 2770 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_last_not_of(const _CharT* __s, size_type __pos = npos) const
>      noexcept
>      {
> ;
> return this->find_last_not_of(__s, __pos, traits_type::length(__s));
>      }
># 2788 "/usr/include/c++/8/bits/basic_string.h" 3
>      size_type
>      find_last_not_of(_CharT __c, size_type __pos = npos) const
>      noexcept;
># 2804 "/usr/include/c++/8/bits/basic_string.h" 3
>      basic_string
>      substr(size_type __pos = 0, size_type __n = npos) const
>      { return basic_string(*this,
>       _M_check(__pos, "basic_string::substr"), __n); }
># 2823 "/usr/include/c++/8/bits/basic_string.h" 3
>      int
>      compare(const basic_string& __str) const
>      {
> const size_type __size = this->size();
> const size_type __osize = __str.size();
> const size_type __len = std::min(__size, __osize);
>
> int __r = traits_type::compare(_M_data(), __str.data(), __len);
> if (!__r)
>   __r = _S_compare(__size, __osize);
> return __r;
>      }
># 2916 "/usr/include/c++/8/bits/basic_string.h" 3
>      int
>      compare(size_type __pos, size_type __n, const basic_string& __str) const;
># 2942 "/usr/include/c++/8/bits/basic_string.h" 3
>      int
>      compare(size_type __pos1, size_type __n1, const basic_string& __str,
>       size_type __pos2, size_type __n2) const;
># 2960 "/usr/include/c++/8/bits/basic_string.h" 3
>      int
>      compare(const _CharT* __s) const noexcept;
># 2984 "/usr/include/c++/8/bits/basic_string.h" 3
>      int
>      compare(size_type __pos, size_type __n1, const _CharT* __s) const;
># 3011 "/usr/include/c++/8/bits/basic_string.h" 3
>      int
>      compare(size_type __pos, size_type __n1, const _CharT* __s,
>       size_type __n2) const;
>
>
>      template<typename, typename, typename> friend class basic_stringbuf;
>    };
>}
># 5886 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    basic_string<_CharT, _Traits, _Alloc>
>    operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>       const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    {
>      basic_string<_CharT, _Traits, _Alloc> __str(__lhs);
>      __str.append(__rhs);
>      return __str;
>    }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    basic_string<_CharT,_Traits,_Alloc>
>    operator+(const _CharT* __lhs,
>       const basic_string<_CharT,_Traits,_Alloc>& __rhs);
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    basic_string<_CharT,_Traits,_Alloc>
>    operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs);
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_string<_CharT, _Traits, _Alloc>
>    operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>       const _CharT* __rhs)
>    {
>      basic_string<_CharT, _Traits, _Alloc> __str(__lhs);
>      __str.append(__rhs);
>      return __str;
>    }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_string<_CharT, _Traits, _Alloc>
>    operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
>    {
>      typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
>      typedef typename __string_type::size_type __size_type;
>      __string_type __str(__lhs);
>      __str.append(__size_type(1), __rhs);
>      return __str;
>    }
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_string<_CharT, _Traits, _Alloc>
>    operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
>       const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    { return std::move(__lhs.append(__rhs)); }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_string<_CharT, _Traits, _Alloc>
>    operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>       basic_string<_CharT, _Traits, _Alloc>&& __rhs)
>    { return std::move(__rhs.insert(0, __lhs)); }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_string<_CharT, _Traits, _Alloc>
>    operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
>       basic_string<_CharT, _Traits, _Alloc>&& __rhs)
>    {
>      const auto __size = __lhs.size() + __rhs.size();
>      const bool __cond = (__size > __lhs.capacity()
>      && __size <= __rhs.capacity());
>      return __cond ? std::move(__rhs.insert(0, __lhs))
>             : std::move(__lhs.append(__rhs));
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_string<_CharT, _Traits, _Alloc>
>    operator+(const _CharT* __lhs,
>       basic_string<_CharT, _Traits, _Alloc>&& __rhs)
>    { return std::move(__rhs.insert(0, __lhs)); }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_string<_CharT, _Traits, _Alloc>
>    operator+(_CharT __lhs,
>       basic_string<_CharT, _Traits, _Alloc>&& __rhs)
>    { return std::move(__rhs.insert(0, 1, __lhs)); }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_string<_CharT, _Traits, _Alloc>
>    operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
>       const _CharT* __rhs)
>    { return std::move(__lhs.append(__rhs)); }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_string<_CharT, _Traits, _Alloc>
>    operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
>       _CharT __rhs)
>    { return std::move(__lhs.append(1, __rhs)); }
># 6007 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>        const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    noexcept
>    { return __lhs.compare(__rhs) == 0; }
>
>  template<typename _CharT>
>    inline
>    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, bool>::__type
>    operator==(const basic_string<_CharT>& __lhs,
>        const basic_string<_CharT>& __rhs) noexcept
>    { return (__lhs.size() == __rhs.size()
>       && !std::char_traits<_CharT>::compare(__lhs.data(), __rhs.data(),
>          __lhs.size())); }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator==(const _CharT* __lhs,
>        const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    { return __rhs.compare(__lhs) == 0; }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>        const _CharT* __rhs)
>    { return __lhs.compare(__rhs) == 0; }
># 6054 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>        const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    noexcept
>    { return !(__lhs == __rhs); }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator!=(const _CharT* __lhs,
>        const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    { return !(__lhs == __rhs); }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>        const _CharT* __rhs)
>    { return !(__lhs == __rhs); }
># 6092 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>       const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    noexcept
>    { return __lhs.compare(__rhs) < 0; }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>       const _CharT* __rhs)
>    { return __lhs.compare(__rhs) < 0; }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator<(const _CharT* __lhs,
>       const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    { return __rhs.compare(__lhs) > 0; }
># 6130 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>       const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    noexcept
>    { return __lhs.compare(__rhs) > 0; }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>       const _CharT* __rhs)
>    { return __lhs.compare(__rhs) > 0; }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator>(const _CharT* __lhs,
>       const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    { return __rhs.compare(__lhs) < 0; }
># 6168 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator<=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>        const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    noexcept
>    { return __lhs.compare(__rhs) <= 0; }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator<=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>        const _CharT* __rhs)
>    { return __lhs.compare(__rhs) <= 0; }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator<=(const _CharT* __lhs,
>        const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    { return __rhs.compare(__lhs) >= 0; }
># 6206 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator>=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>        const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    noexcept
>    { return __lhs.compare(__rhs) >= 0; }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator>=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
>        const _CharT* __rhs)
>    { return __lhs.compare(__rhs) >= 0; }
>
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline bool
>    operator>=(const _CharT* __lhs,
>      const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    { return __rhs.compare(__lhs) <= 0; }
># 6244 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline void
>    swap(basic_string<_CharT, _Traits, _Alloc>& __lhs,
>  basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    noexcept(noexcept(__lhs.swap(__rhs)))
>    { __lhs.swap(__rhs); }
># 6264 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    basic_istream<_CharT, _Traits>&
>    operator>>(basic_istream<_CharT, _Traits>& __is,
>        basic_string<_CharT, _Traits, _Alloc>& __str);
>
>  template<>
>    basic_istream<char>&
>    operator>>(basic_istream<char>& __is, basic_string<char>& __str);
># 6282 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_ostream<_CharT, _Traits>&
>    operator<<(basic_ostream<_CharT, _Traits>& __os,
>        const basic_string<_CharT, _Traits, _Alloc>& __str)
>    {
>
>
>      return __ostream_insert(__os, __str.data(), __str.size());
>    }
># 6305 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    basic_istream<_CharT, _Traits>&
>    getline(basic_istream<_CharT, _Traits>& __is,
>     basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim);
># 6322 "/usr/include/c++/8/bits/basic_string.h" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_istream<_CharT, _Traits>&
>    getline(basic_istream<_CharT, _Traits>& __is,
>     basic_string<_CharT, _Traits, _Alloc>& __str)
>    { return std::getline(__is, __str, __is.widen('\n')); }
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_istream<_CharT, _Traits>&
>    getline(basic_istream<_CharT, _Traits>&& __is,
>     basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim)
>    { return std::getline(__is, __str, __delim); }
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    inline basic_istream<_CharT, _Traits>&
>    getline(basic_istream<_CharT, _Traits>&& __is,
>     basic_string<_CharT, _Traits, _Alloc>& __str)
>    { return std::getline(__is, __str); }
>
>
>  template<>
>    basic_istream<char>&
>    getline(basic_istream<char>& __in, basic_string<char>& __str,
>     char __delim);
>
>
>  template<>
>    basic_istream<wchar_t>&
>    getline(basic_istream<wchar_t>& __in, basic_string<wchar_t>& __str,
>     wchar_t __delim);
>
>
>
>}
>
>
>
># 1 "/usr/include/c++/8/ext/string_conversions.h" 1 3
># 32 "/usr/include/c++/8/ext/string_conversions.h" 3
>       
># 33 "/usr/include/c++/8/ext/string_conversions.h" 3
># 41 "/usr/include/c++/8/ext/string_conversions.h" 3
># 1 "/usr/include/c++/8/cstdlib" 1 3
># 39 "/usr/include/c++/8/cstdlib" 3
>       
># 40 "/usr/include/c++/8/cstdlib" 3
># 75 "/usr/include/c++/8/cstdlib" 3
># 1 "/usr/include/stdlib.h" 1 3 4
># 25 "/usr/include/stdlib.h" 3 4
># 1 "/usr/include/bits/libc-header-start.h" 1 3 4
># 26 "/usr/include/stdlib.h" 2 3 4
>
>
>
>
>
># 1 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 1 3 4
># 32 "/usr/include/stdlib.h" 2 3 4
>
>extern "C" {
>
>
>
>
>
># 1 "/usr/include/bits/waitflags.h" 1 3 4
># 40 "/usr/include/stdlib.h" 2 3 4
># 1 "/usr/include/bits/waitstatus.h" 1 3 4
># 41 "/usr/include/stdlib.h" 2 3 4
># 58 "/usr/include/stdlib.h" 3 4
>typedef struct
>  {
>    int quot;
>    int rem;
>  } div_t;
>
>
>
>typedef struct
>  {
>    long int quot;
>    long int rem;
>  } ldiv_t;
>
>
>
>
>
>__extension__ typedef struct
>  {
>    long long int quot;
>    long long int rem;
>  } lldiv_t;
># 97 "/usr/include/stdlib.h" 3 4
>extern size_t __ctype_get_mb_cur_max (void) throw () ;
>
>
>
>extern double atof (const char *__nptr)
>     throw () __attribute__ ((__pure__)) __attribute__ ((__nonnull__ (1))) ;
>
>extern int atoi (const char *__nptr)
>     throw () __attribute__ ((__pure__)) __attribute__ ((__nonnull__ (1))) ;
>
>extern long int atol (const char *__nptr)
>     throw () __attribute__ ((__pure__)) __attribute__ ((__nonnull__ (1))) ;
>
>
>
>__extension__ extern long long int atoll (const char *__nptr)
>     throw () __attribute__ ((__pure__)) __attribute__ ((__nonnull__ (1))) ;
>
>
>
>extern double strtod (const char *__restrict __nptr,
>        char **__restrict __endptr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern float strtof (const char *__restrict __nptr,
>       char **__restrict __endptr) throw () __attribute__ ((__nonnull__ (1)));
>
>extern long double strtold (const char *__restrict __nptr,
>       char **__restrict __endptr)
>     throw () __attribute__ ((__nonnull__ (1)));
># 140 "/usr/include/stdlib.h" 3 4
>extern _Float32 strtof32 (const char *__restrict __nptr,
>     char **__restrict __endptr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern _Float64 strtof64 (const char *__restrict __nptr,
>     char **__restrict __endptr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern _Float128 strtof128 (const char *__restrict __nptr,
>       char **__restrict __endptr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern _Float32x strtof32x (const char *__restrict __nptr,
>       char **__restrict __endptr)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>extern _Float64x strtof64x (const char *__restrict __nptr,
>       char **__restrict __endptr)
>     throw () __attribute__ ((__nonnull__ (1)));
># 176 "/usr/include/stdlib.h" 3 4
>extern long int strtol (const char *__restrict __nptr,
>   char **__restrict __endptr, int __base)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>extern unsigned long int strtoul (const char *__restrict __nptr,
>      char **__restrict __endptr, int __base)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>__extension__
>extern long long int strtoq (const char *__restrict __nptr,
>        char **__restrict __endptr, int __base)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>__extension__
>extern unsigned long long int strtouq (const char *__restrict __nptr,
>           char **__restrict __endptr, int __base)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>__extension__
>extern long long int strtoll (const char *__restrict __nptr,
>         char **__restrict __endptr, int __base)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>__extension__
>extern unsigned long long int strtoull (const char *__restrict __nptr,
>     char **__restrict __endptr, int __base)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>extern int strfromd (char *__dest, size_t __size, const char *__format,
>       double __f)
>     throw () __attribute__ ((__nonnull__ (3)));
>
>extern int strfromf (char *__dest, size_t __size, const char *__format,
>       float __f)
>     throw () __attribute__ ((__nonnull__ (3)));
>
>extern int strfroml (char *__dest, size_t __size, const char *__format,
>       long double __f)
>     throw () __attribute__ ((__nonnull__ (3)));
># 232 "/usr/include/stdlib.h" 3 4
>extern int strfromf32 (char *__dest, size_t __size, const char * __format,
>         _Float32 __f)
>     throw () __attribute__ ((__nonnull__ (3)));
>
>
>
>extern int strfromf64 (char *__dest, size_t __size, const char * __format,
>         _Float64 __f)
>     throw () __attribute__ ((__nonnull__ (3)));
>
>
>
>extern int strfromf128 (char *__dest, size_t __size, const char * __format,
>   _Float128 __f)
>     throw () __attribute__ ((__nonnull__ (3)));
>
>
>
>extern int strfromf32x (char *__dest, size_t __size, const char * __format,
>   _Float32x __f)
>     throw () __attribute__ ((__nonnull__ (3)));
>
>
>
>extern int strfromf64x (char *__dest, size_t __size, const char * __format,
>   _Float64x __f)
>     throw () __attribute__ ((__nonnull__ (3)));
># 274 "/usr/include/stdlib.h" 3 4
>extern long int strtol_l (const char *__restrict __nptr,
>     char **__restrict __endptr, int __base,
>     locale_t __loc) throw () __attribute__ ((__nonnull__ (1, 4)));
>
>extern unsigned long int strtoul_l (const char *__restrict __nptr,
>        char **__restrict __endptr,
>        int __base, locale_t __loc)
>     throw () __attribute__ ((__nonnull__ (1, 4)));
>
>__extension__
>extern long long int strtoll_l (const char *__restrict __nptr,
>    char **__restrict __endptr, int __base,
>    locale_t __loc)
>     throw () __attribute__ ((__nonnull__ (1, 4)));
>
>__extension__
>extern unsigned long long int strtoull_l (const char *__restrict __nptr,
>       char **__restrict __endptr,
>       int __base, locale_t __loc)
>     throw () __attribute__ ((__nonnull__ (1, 4)));
>
>extern double strtod_l (const char *__restrict __nptr,
>   char **__restrict __endptr, locale_t __loc)
>     throw () __attribute__ ((__nonnull__ (1, 3)));
>
>extern float strtof_l (const char *__restrict __nptr,
>         char **__restrict __endptr, locale_t __loc)
>     throw () __attribute__ ((__nonnull__ (1, 3)));
>
>extern long double strtold_l (const char *__restrict __nptr,
>         char **__restrict __endptr,
>         locale_t __loc)
>     throw () __attribute__ ((__nonnull__ (1, 3)));
># 316 "/usr/include/stdlib.h" 3 4
>extern _Float32 strtof32_l (const char *__restrict __nptr,
>       char **__restrict __endptr,
>       locale_t __loc)
>     throw () __attribute__ ((__nonnull__ (1, 3)));
>
>
>
>extern _Float64 strtof64_l (const char *__restrict __nptr,
>       char **__restrict __endptr,
>       locale_t __loc)
>     throw () __attribute__ ((__nonnull__ (1, 3)));
>
>
>
>extern _Float128 strtof128_l (const char *__restrict __nptr,
>         char **__restrict __endptr,
>         locale_t __loc)
>     throw () __attribute__ ((__nonnull__ (1, 3)));
>
>
>
>extern _Float32x strtof32x_l (const char *__restrict __nptr,
>         char **__restrict __endptr,
>         locale_t __loc)
>     throw () __attribute__ ((__nonnull__ (1, 3)));
>
>
>
>extern _Float64x strtof64x_l (const char *__restrict __nptr,
>         char **__restrict __endptr,
>         locale_t __loc)
>     throw () __attribute__ ((__nonnull__ (1, 3)));
># 385 "/usr/include/stdlib.h" 3 4
>extern char *l64a (long int __n) throw () ;
>
>
>extern long int a64l (const char *__s)
>     throw () __attribute__ ((__pure__)) __attribute__ ((__nonnull__ (1))) ;
>
>
>
>
># 1 "/usr/include/sys/types.h" 1 3 4
># 27 "/usr/include/sys/types.h" 3 4
>extern "C" {
>
>
>
>
>
>typedef __u_char u_char;
>typedef __u_short u_short;
>typedef __u_int u_int;
>typedef __u_long u_long;
>typedef __quad_t quad_t;
>typedef __u_quad_t u_quad_t;
>typedef __fsid_t fsid_t;
>
>
>typedef __loff_t loff_t;
>
>
>
>
>typedef __ino_t ino_t;
>
>
>
>
>
>
>typedef __ino64_t ino64_t;
>
>
>
>
>typedef __dev_t dev_t;
>
>
>
>
>typedef __gid_t gid_t;
>
>
>
>
>typedef __mode_t mode_t;
>
>
>
>
>typedef __nlink_t nlink_t;
>
>
>
>
>typedef __uid_t uid_t;
>
>
>
>
>
>typedef __off_t off_t;
>
>
>
>
>
>
>typedef __off64_t off64_t;
># 103 "/usr/include/sys/types.h" 3 4
>typedef __id_t id_t;
>
>
>
>
>typedef __ssize_t ssize_t;
>
>
>
>
>
>typedef __daddr_t daddr_t;
>typedef __caddr_t caddr_t;
>
>
>
>
>
>typedef __key_t key_t;
># 134 "/usr/include/sys/types.h" 3 4
>typedef __useconds_t useconds_t;
>
>
>
>typedef __suseconds_t suseconds_t;
>
>
>
>
>
># 1 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 1 3 4
># 145 "/usr/include/sys/types.h" 2 3 4
>
>
>
>typedef unsigned long int ulong;
>typedef unsigned short int ushort;
>typedef unsigned int uint;
># 177 "/usr/include/sys/types.h" 3 4
>typedef unsigned int u_int8_t __attribute__ ((__mode__ (__QI__)));
>typedef unsigned int u_int16_t __attribute__ ((__mode__ (__HI__)));
>typedef unsigned int u_int32_t __attribute__ ((__mode__ (__SI__)));
>typedef unsigned int u_int64_t __attribute__ ((__mode__ (__DI__)));
>
>typedef int register_t __attribute__ ((__mode__ (__word__)));
># 196 "/usr/include/sys/types.h" 3 4
># 1 "/usr/include/sys/select.h" 1 3 4
># 30 "/usr/include/sys/select.h" 3 4
># 1 "/usr/include/bits/select.h" 1 3 4
># 22 "/usr/include/bits/select.h" 3 4
># 1 "/usr/include/bits/wordsize.h" 1 3 4
># 23 "/usr/include/bits/select.h" 2 3 4
># 31 "/usr/include/sys/select.h" 2 3 4
>
>
># 1 "/usr/include/bits/types/sigset_t.h" 1 3 4
>
>
>
># 1 "/usr/include/bits/types/__sigset_t.h" 1 3 4
>
>
>
>
>typedef struct
>{
>  unsigned long int __val[(1024 / (8 * sizeof (unsigned long int)))];
>} __sigset_t;
># 5 "/usr/include/bits/types/sigset_t.h" 2 3 4
>
>
>typedef __sigset_t sigset_t;
># 34 "/usr/include/sys/select.h" 2 3 4
># 49 "/usr/include/sys/select.h" 3 4
>typedef long int __fd_mask;
># 59 "/usr/include/sys/select.h" 3 4
>typedef struct
>  {
>
>
>
>    __fd_mask fds_bits[1024 / (8 * (int) sizeof (__fd_mask))];
>
>
>
>
>
>  } fd_set;
>
>
>
>
>
>
>typedef __fd_mask fd_mask;
># 91 "/usr/include/sys/select.h" 3 4
>extern "C" {
># 101 "/usr/include/sys/select.h" 3 4
>extern int select (int __nfds, fd_set *__restrict __readfds,
>     fd_set *__restrict __writefds,
>     fd_set *__restrict __exceptfds,
>     struct timeval *__restrict __timeout);
># 113 "/usr/include/sys/select.h" 3 4
>extern int pselect (int __nfds, fd_set *__restrict __readfds,
>      fd_set *__restrict __writefds,
>      fd_set *__restrict __exceptfds,
>      const struct timespec *__restrict __timeout,
>      const __sigset_t *__restrict __sigmask);
># 126 "/usr/include/sys/select.h" 3 4
>}
># 197 "/usr/include/sys/types.h" 2 3 4
>
>
>
>
>
>typedef __blksize_t blksize_t;
>
>
>
>
>
>
>typedef __blkcnt_t blkcnt_t;
>
>
>
>typedef __fsblkcnt_t fsblkcnt_t;
>
>
>
>typedef __fsfilcnt_t fsfilcnt_t;
># 236 "/usr/include/sys/types.h" 3 4
>typedef __blkcnt64_t blkcnt64_t;
>typedef __fsblkcnt64_t fsblkcnt64_t;
>typedef __fsfilcnt64_t fsfilcnt64_t;
># 247 "/usr/include/sys/types.h" 3 4
>}
># 395 "/usr/include/stdlib.h" 2 3 4
>
>
>
>
>
>
>extern long int random (void) throw ();
>
>
>extern void srandom (unsigned int __seed) throw ();
>
>
>
>
>
>extern char *initstate (unsigned int __seed, char *__statebuf,
>   size_t __statelen) throw () __attribute__ ((__nonnull__ (2)));
>
>
>
>extern char *setstate (char *__statebuf) throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>
>
>
>struct random_data
>  {
>    int32_t *fptr;
>    int32_t *rptr;
>    int32_t *state;
>    int rand_type;
>    int rand_deg;
>    int rand_sep;
>    int32_t *end_ptr;
>  };
>
>extern int random_r (struct random_data *__restrict __buf,
>       int32_t *__restrict __result) throw () __attribute__ ((__nonnull__ (1, 2)));
>
>extern int srandom_r (unsigned int __seed, struct random_data *__buf)
>     throw () __attribute__ ((__nonnull__ (2)));
>
>extern int initstate_r (unsigned int __seed, char *__restrict __statebuf,
>   size_t __statelen,
>   struct random_data *__restrict __buf)
>     throw () __attribute__ ((__nonnull__ (2, 4)));
>
>extern int setstate_r (char *__restrict __statebuf,
>         struct random_data *__restrict __buf)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>
>
>
>extern int rand (void) throw ();
>
>extern void srand (unsigned int __seed) throw ();
>
>
>
>extern int rand_r (unsigned int *__seed) throw ();
>
>
>
>
>
>
>
>extern double drand48 (void) throw ();
>extern double erand48 (unsigned short int __xsubi[3]) throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern long int lrand48 (void) throw ();
>extern long int nrand48 (unsigned short int __xsubi[3])
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern long int mrand48 (void) throw ();
>extern long int jrand48 (unsigned short int __xsubi[3])
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>extern void srand48 (long int __seedval) throw ();
>extern unsigned short int *seed48 (unsigned short int __seed16v[3])
>     throw () __attribute__ ((__nonnull__ (1)));
>extern void lcong48 (unsigned short int __param[7]) throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>
>struct drand48_data
>  {
>    unsigned short int __x[3];
>    unsigned short int __old_x[3];
>    unsigned short int __c;
>    unsigned short int __init;
>    __extension__ unsigned long long int __a;
>
>  };
>
>
>extern int drand48_r (struct drand48_data *__restrict __buffer,
>        double *__restrict __result) throw () __attribute__ ((__nonnull__ (1, 2)));
>extern int erand48_r (unsigned short int __xsubi[3],
>        struct drand48_data *__restrict __buffer,
>        double *__restrict __result) throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int lrand48_r (struct drand48_data *__restrict __buffer,
>        long int *__restrict __result)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>extern int nrand48_r (unsigned short int __xsubi[3],
>        struct drand48_data *__restrict __buffer,
>        long int *__restrict __result)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int mrand48_r (struct drand48_data *__restrict __buffer,
>        long int *__restrict __result)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>extern int jrand48_r (unsigned short int __xsubi[3],
>        struct drand48_data *__restrict __buffer,
>        long int *__restrict __result)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>extern int srand48_r (long int __seedval, struct drand48_data *__buffer)
>     throw () __attribute__ ((__nonnull__ (2)));
>
>extern int seed48_r (unsigned short int __seed16v[3],
>       struct drand48_data *__buffer) throw () __attribute__ ((__nonnull__ (1, 2)));
>
>extern int lcong48_r (unsigned short int __param[7],
>        struct drand48_data *__buffer)
>     throw () __attribute__ ((__nonnull__ (1, 2)));
>
>
>
>
>extern void *malloc (size_t __size) throw () __attribute__ ((__malloc__)) ;
>
>extern void *calloc (size_t __nmemb, size_t __size)
>     throw () __attribute__ ((__malloc__)) ;
>
>
>
>
>
>
>extern void *realloc (void *__ptr, size_t __size)
>     throw () __attribute__ ((__warn_unused_result__));
>
>
>
>
>
>
>
>extern void *reallocarray (void *__ptr, size_t __nmemb, size_t __size)
>     throw () __attribute__ ((__warn_unused_result__));
>
>
>
>extern void free (void *__ptr) throw ();
>
>
># 1 "/usr/include/alloca.h" 1 3 4
># 24 "/usr/include/alloca.h" 3 4
># 1 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 1 3 4
># 25 "/usr/include/alloca.h" 2 3 4
>
>extern "C" {
>
>
>
>
>
>extern void *alloca (size_t __size) throw ();
>
>
>
>
>
>}
># 567 "/usr/include/stdlib.h" 2 3 4
>
>
>
>
>
>extern void *valloc (size_t __size) throw () __attribute__ ((__malloc__)) ;
>
>
>
>
>extern int posix_memalign (void **__memptr, size_t __alignment, size_t __size)
>     throw () __attribute__ ((__nonnull__ (1))) ;
>
>
>
>
>extern void *aligned_alloc (size_t __alignment, size_t __size)
>     throw () __attribute__ ((__malloc__)) __attribute__ ((__alloc_size__ (2))) ;
>
>
>
>extern void abort (void) throw () __attribute__ ((__noreturn__));
>
>
>
>extern int atexit (void (*__func) (void)) throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>extern "C++" int at_quick_exit (void (*__func) (void))
>     throw () __asm ("at_quick_exit") __attribute__ ((__nonnull__ (1)));
># 607 "/usr/include/stdlib.h" 3 4
>extern int on_exit (void (*__func) (int __status, void *__arg), void *__arg)
>     throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>
>extern void exit (int __status) throw () __attribute__ ((__noreturn__));
>
>
>
>
>
>extern void quick_exit (int __status) throw () __attribute__ ((__noreturn__));
>
>
>
>
>
>extern void _Exit (int __status) throw () __attribute__ ((__noreturn__));
>
>
>
>
>extern char *getenv (const char *__name) throw () __attribute__ ((__nonnull__ (1))) ;
>
>
>
>
>extern char *secure_getenv (const char *__name)
>     throw () __attribute__ ((__nonnull__ (1))) ;
>
>
>
>
>
>
>extern int putenv (char *__string) throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>
>extern int setenv (const char *__name, const char *__value, int __replace)
>     throw () __attribute__ ((__nonnull__ (2)));
>
>
>extern int unsetenv (const char *__name) throw () __attribute__ ((__nonnull__ (1)));
>
>
>
>
>
>
>extern int clearenv (void) throw ();
># 672 "/usr/include/stdlib.h" 3 4
>extern char *mktemp (char *__template) throw () __attribute__ ((__nonnull__ (1)));
># 685 "/usr/include/stdlib.h" 3 4
>extern int mkstemp (char *__template) __attribute__ ((__nonnull__ (1))) ;
># 695 "/usr/include/stdlib.h" 3 4
>extern int mkstemp64 (char *__template) __attribute__ ((__nonnull__ (1))) ;
># 707 "/usr/include/stdlib.h" 3 4
>extern int mkstemps (char *__template, int __suffixlen) __attribute__ ((__nonnull__ (1))) ;
># 717 "/usr/include/stdlib.h" 3 4
>extern int mkstemps64 (char *__template, int __suffixlen)
>     __attribute__ ((__nonnull__ (1))) ;
># 728 "/usr/include/stdlib.h" 3 4
>extern char *mkdtemp (char *__template) throw () __attribute__ ((__nonnull__ (1))) ;
># 739 "/usr/include/stdlib.h" 3 4
>extern int mkostemp (char *__template, int __flags) __attribute__ ((__nonnull__ (1))) ;
># 749 "/usr/include/stdlib.h" 3 4
>extern int mkostemp64 (char *__template, int __flags) __attribute__ ((__nonnull__ (1))) ;
># 759 "/usr/include/stdlib.h" 3 4
>extern int mkostemps (char *__template, int __suffixlen, int __flags)
>     __attribute__ ((__nonnull__ (1))) ;
># 771 "/usr/include/stdlib.h" 3 4
>extern int mkostemps64 (char *__template, int __suffixlen, int __flags)
>     __attribute__ ((__nonnull__ (1))) ;
># 781 "/usr/include/stdlib.h" 3 4
>extern int system (const char *__command) ;
>
>
>
>
>
>extern char *canonicalize_file_name (const char *__name)
>     throw () __attribute__ ((__nonnull__ (1))) ;
># 797 "/usr/include/stdlib.h" 3 4
>extern char *realpath (const char *__restrict __name,
>         char *__restrict __resolved) throw () ;
>
>
>
>
>
>
>typedef int (*__compar_fn_t) (const void *, const void *);
>
>
>typedef __compar_fn_t comparison_fn_t;
>
>
>
>typedef int (*__compar_d_fn_t) (const void *, const void *, void *);
>
>
>
>
>extern void *bsearch (const void *__key, const void *__base,
>        size_t __nmemb, size_t __size, __compar_fn_t __compar)
>     __attribute__ ((__nonnull__ (1, 2, 5))) ;
>
>
>
>
>
>
>
>extern void qsort (void *__base, size_t __nmemb, size_t __size,
>     __compar_fn_t __compar) __attribute__ ((__nonnull__ (1, 4)));
>
>extern void qsort_r (void *__base, size_t __nmemb, size_t __size,
>       __compar_d_fn_t __compar, void *__arg)
>  __attribute__ ((__nonnull__ (1, 4)));
>
>
>
>
>extern int abs (int __x) throw () __attribute__ ((__const__)) ;
>extern long int labs (long int __x) throw () __attribute__ ((__const__)) ;
>
>
>__extension__ extern long long int llabs (long long int __x)
>     throw () __attribute__ ((__const__)) ;
>
>
>
>
>
>
>extern div_t div (int __numer, int __denom)
>     throw () __attribute__ ((__const__)) ;
>extern ldiv_t ldiv (long int __numer, long int __denom)
>     throw () __attribute__ ((__const__)) ;
>
>
>__extension__ extern lldiv_t lldiv (long long int __numer,
>        long long int __denom)
>     throw () __attribute__ ((__const__)) ;
># 869 "/usr/include/stdlib.h" 3 4
>extern char *ecvt (double __value, int __ndigit, int *__restrict __decpt,
>     int *__restrict __sign) throw () __attribute__ ((__nonnull__ (3, 4))) ;
>
>
>
>
>extern char *fcvt (double __value, int __ndigit, int *__restrict __decpt,
>     int *__restrict __sign) throw () __attribute__ ((__nonnull__ (3, 4))) ;
>
>
>
>
>extern char *gcvt (double __value, int __ndigit, char *__buf)
>     throw () __attribute__ ((__nonnull__ (3))) ;
>
>
>
>
>extern char *qecvt (long double __value, int __ndigit,
>      int *__restrict __decpt, int *__restrict __sign)
>     throw () __attribute__ ((__nonnull__ (3, 4))) ;
>extern char *qfcvt (long double __value, int __ndigit,
>      int *__restrict __decpt, int *__restrict __sign)
>     throw () __attribute__ ((__nonnull__ (3, 4))) ;
>extern char *qgcvt (long double __value, int __ndigit, char *__buf)
>     throw () __attribute__ ((__nonnull__ (3))) ;
>
>
>
>
>extern int ecvt_r (double __value, int __ndigit, int *__restrict __decpt,
>     int *__restrict __sign, char *__restrict __buf,
>     size_t __len) throw () __attribute__ ((__nonnull__ (3, 4, 5)));
>extern int fcvt_r (double __value, int __ndigit, int *__restrict __decpt,
>     int *__restrict __sign, char *__restrict __buf,
>     size_t __len) throw () __attribute__ ((__nonnull__ (3, 4, 5)));
>
>extern int qecvt_r (long double __value, int __ndigit,
>      int *__restrict __decpt, int *__restrict __sign,
>      char *__restrict __buf, size_t __len)
>     throw () __attribute__ ((__nonnull__ (3, 4, 5)));
>extern int qfcvt_r (long double __value, int __ndigit,
>      int *__restrict __decpt, int *__restrict __sign,
>      char *__restrict __buf, size_t __len)
>     throw () __attribute__ ((__nonnull__ (3, 4, 5)));
>
>
>
>
>
>extern int mblen (const char *__s, size_t __n) throw ();
>
>
>extern int mbtowc (wchar_t *__restrict __pwc,
>     const char *__restrict __s, size_t __n) throw ();
>
>
>extern int wctomb (char *__s, wchar_t __wchar) throw ();
>
>
>
>extern size_t mbstowcs (wchar_t *__restrict __pwcs,
>   const char *__restrict __s, size_t __n) throw ();
>
>extern size_t wcstombs (char *__restrict __s,
>   const wchar_t *__restrict __pwcs, size_t __n)
>     throw ();
>
>
>
>
>
>
>
>extern int rpmatch (const char *__response) throw () __attribute__ ((__nonnull__ (1))) ;
># 954 "/usr/include/stdlib.h" 3 4
>extern int getsubopt (char **__restrict __optionp,
>        char *const *__restrict __tokens,
>        char **__restrict __valuep)
>     throw () __attribute__ ((__nonnull__ (1, 2, 3))) ;
>
>
>
>
>
>
>
>extern int posix_openpt (int __oflag) ;
>
>
>
>
>
>
>
>extern int grantpt (int __fd) throw ();
>
>
>
>extern int unlockpt (int __fd) throw ();
>
>
>
>
>extern char *ptsname (int __fd) throw () ;
>
>
>
>
>
>
>extern int ptsname_r (int __fd, char *__buf, size_t __buflen)
>     throw () __attribute__ ((__nonnull__ (2)));
>
>
>extern int getpt (void);
>
>
>
>
>
>
>extern int getloadavg (double __loadavg[], int __nelem)
>     throw () __attribute__ ((__nonnull__ (1)));
># 1010 "/usr/include/stdlib.h" 3 4
># 1 "/usr/include/bits/stdlib-float.h" 1 3 4
># 1011 "/usr/include/stdlib.h" 2 3 4
># 1020 "/usr/include/stdlib.h" 3 4
>}
># 76 "/usr/include/c++/8/cstdlib" 2 3
>
># 1 "/usr/include/c++/8/bits/std_abs.h" 1 3
># 33 "/usr/include/c++/8/bits/std_abs.h" 3
>       
># 34 "/usr/include/c++/8/bits/std_abs.h" 3
># 46 "/usr/include/c++/8/bits/std_abs.h" 3
>extern "C++"
>{
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  using ::abs;
>
>
>  inline long
>  abs(long __i) { return __builtin_labs(__i); }
>
>
>
>  inline long long
>  abs(long long __x) { return __builtin_llabs (__x); }
>
>
>
>
>
>
>
>  inline constexpr double
>  abs(double __x)
>  { return __builtin_fabs(__x); }
>
>  inline constexpr float
>  abs(float __x)
>  { return __builtin_fabsf(__x); }
>
>  inline constexpr long double
>  abs(long double __x)
>  { return __builtin_fabsl(__x); }
>
>
>
>  inline constexpr __int128
>  abs(__int128 __x) { return __x >= 0 ? __x : -__x; }
># 100 "/usr/include/c++/8/bits/std_abs.h" 3
>  inline constexpr
>  __float128
>  abs(__float128 __x)
>  { return __x < 0 ? -__x : __x; }
>
>
>
>}
>}
># 78 "/usr/include/c++/8/cstdlib" 2 3
># 121 "/usr/include/c++/8/cstdlib" 3
>extern "C++"
>{
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  using ::div_t;
>  using ::ldiv_t;
>
>  using ::abort;
>
>
>
>  using ::atexit;
>
>
>  using ::at_quick_exit;
>
>
>  using ::atof;
>  using ::atoi;
>  using ::atol;
>  using ::bsearch;
>  using ::calloc;
>  using ::div;
>  using ::exit;
>  using ::free;
>  using ::getenv;
>  using ::labs;
>  using ::ldiv;
>  using ::malloc;
>
>  using ::mblen;
>  using ::mbstowcs;
>  using ::mbtowc;
>
>  using ::qsort;
>
>
>  using ::quick_exit;
>
>
>  using ::rand;
>  using ::realloc;
>  using ::srand;
>  using ::strtod;
>  using ::strtol;
>  using ::strtoul;
>  using ::system;
>
>  using ::wcstombs;
>  using ::wctomb;
>
>
>
>  inline ldiv_t
>  div(long __i, long __j) { return ldiv(__i, __j); }
>
>
>
>
>}
># 195 "/usr/include/c++/8/cstdlib" 3
>namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>  using ::lldiv_t;
>
>
>
>
>
>  using ::_Exit;
>
>
>
>  using ::llabs;
>
>  inline lldiv_t
>  div(long long __n, long long __d)
>  { lldiv_t __q; __q.quot = __n / __d; __q.rem = __n % __d; return __q; }
>
>  using ::lldiv;
># 227 "/usr/include/c++/8/cstdlib" 3
>  using ::atoll;
>  using ::strtoll;
>  using ::strtoull;
>
>  using ::strtof;
>  using ::strtold;
>
>
>}
>
>namespace std
>{
>
>  using ::__gnu_cxx::lldiv_t;
>
>  using ::__gnu_cxx::_Exit;
>
>  using ::__gnu_cxx::llabs;
>  using ::__gnu_cxx::div;
>  using ::__gnu_cxx::lldiv;
>
>  using ::__gnu_cxx::atoll;
>  using ::__gnu_cxx::strtof;
>  using ::__gnu_cxx::strtoll;
>  using ::__gnu_cxx::strtoull;
>  using ::__gnu_cxx::strtold;
>}
>
>
>
>}
># 42 "/usr/include/c++/8/ext/string_conversions.h" 2 3
># 1 "/usr/include/c++/8/cwchar" 1 3
># 39 "/usr/include/c++/8/cwchar" 3
>       
># 40 "/usr/include/c++/8/cwchar" 3
># 43 "/usr/include/c++/8/ext/string_conversions.h" 2 3
># 1 "/usr/include/c++/8/cstdio" 1 3
># 39 "/usr/include/c++/8/cstdio" 3
>       
># 40 "/usr/include/c++/8/cstdio" 3
>
>
># 1 "/usr/include/stdio.h" 1 3 4
># 27 "/usr/include/stdio.h" 3 4
># 1 "/usr/include/bits/libc-header-start.h" 1 3 4
># 28 "/usr/include/stdio.h" 2 3 4
>
>extern "C" {
>
>
>
># 1 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stddef.h" 1 3 4
># 34 "/usr/include/stdio.h" 2 3 4
>
>
># 1 "/usr/lib/gcc/x86_64-redhat-linux/8/include/stdarg.h" 1 3 4
># 37 "/usr/include/stdio.h" 2 3 4
>
>
># 1 "/usr/include/bits/types/__fpos_t.h" 1 3 4
># 10 "/usr/include/bits/types/__fpos_t.h" 3 4
>typedef struct _G_fpos_t
>{
>  __off_t __pos;
>  __mbstate_t __state;
>} __fpos_t;
># 40 "/usr/include/stdio.h" 2 3 4
># 1 "/usr/include/bits/types/__fpos64_t.h" 1 3 4
># 10 "/usr/include/bits/types/__fpos64_t.h" 3 4
>typedef struct _G_fpos64_t
>{
>  __off64_t __pos;
>  __mbstate_t __state;
>} __fpos64_t;
># 41 "/usr/include/stdio.h" 2 3 4
>
>
># 1 "/usr/include/bits/types/struct_FILE.h" 1 3 4
># 35 "/usr/include/bits/types/struct_FILE.h" 3 4
>struct _IO_FILE;
>struct _IO_marker;
>struct _IO_codecvt;
>struct _IO_wide_data;
>
>
>
>
>typedef void _IO_lock_t;
>
>
>
>
>
>struct _IO_FILE
>{
>  int _flags;
>
>
>  char *_IO_read_ptr;
>  char *_IO_read_end;
>  char *_IO_read_base;
>  char *_IO_write_base;
>  char *_IO_write_ptr;
>  char *_IO_write_end;
>  char *_IO_buf_base;
>  char *_IO_buf_end;
>
>
>  char *_IO_save_base;
>  char *_IO_backup_base;
>  char *_IO_save_end;
>
>  struct _IO_marker *_markers;
>
>  struct _IO_FILE *_chain;
>
>  int _fileno;
>  int _flags2;
>  __off_t _old_offset;
>
>
>  unsigned short _cur_column;
>  signed char _vtable_offset;
>  char _shortbuf[1];
>
>  _IO_lock_t *_lock;
>
>
>
>
>
>
>
>  __off64_t _offset;
>
>  struct _IO_codecvt *_codecvt;
>  struct _IO_wide_data *_wide_data;
>  struct _IO_FILE *_freeres_list;
>  void *_freeres_buf;
>  size_t __pad5;
>  int _mode;
>
>  char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)];
>};
># 44 "/usr/include/stdio.h" 2 3 4
>
>
># 1 "/usr/include/bits/types/cookie_io_functions_t.h" 1 3 4
># 27 "/usr/include/bits/types/cookie_io_functions_t.h" 3 4
>typedef __ssize_t cookie_read_function_t (void *__cookie, char *__buf,
>                                          size_t __nbytes);
>
>
>
>
>
>
>
>typedef __ssize_t cookie_write_function_t (void *__cookie, const char *__buf,
>                                           size_t __nbytes);
>
>
>
>
>
>
>
>typedef int cookie_seek_function_t (void *__cookie, __off64_t *__pos, int __w);
>
>
>typedef int cookie_close_function_t (void *__cookie);
>
>
>
>
>
>
>typedef struct _IO_cookie_io_functions_t
>{
>  cookie_read_function_t *read;
>  cookie_write_function_t *write;
>  cookie_seek_function_t *seek;
>  cookie_close_function_t *close;
>} cookie_io_functions_t;
># 47 "/usr/include/stdio.h" 2 3 4
>
>
>
>
>
>typedef __gnuc_va_list va_list;
># 84 "/usr/include/stdio.h" 3 4
>typedef __fpos_t fpos_t;
>
>
>
>
>typedef __fpos64_t fpos64_t;
># 133 "/usr/include/stdio.h" 3 4
># 1 "/usr/include/bits/stdio_lim.h" 1 3 4
># 134 "/usr/include/stdio.h" 2 3 4
>
>
>
>extern FILE *stdin;
>extern FILE *stdout;
>extern FILE *stderr;
>
>
>
>
>
>
>extern int remove (const char *__filename) throw ();
>
>extern int rename (const char *__old, const char *__new) throw ();
>
>
>
>extern int renameat (int __oldfd, const char *__old, int __newfd,
>       const char *__new) throw ();
>
>
>
>
>
>
>
>extern FILE *tmpfile (void) ;
># 171 "/usr/include/stdio.h" 3 4
>extern FILE *tmpfile64 (void) ;
>
>
>
>extern char *tmpnam (char *__s) throw () ;
>
>
>
>
>extern char *tmpnam_r (char *__s) throw () ;
># 192 "/usr/include/stdio.h" 3 4
>extern char *tempnam (const char *__dir, const char *__pfx)
>     throw () __attribute__ ((__malloc__)) ;
>
>
>
>
>
>
>
>extern int fclose (FILE *__stream);
>
>
>
>
>extern int fflush (FILE *__stream);
># 215 "/usr/include/stdio.h" 3 4
>extern int fflush_unlocked (FILE *__stream);
># 225 "/usr/include/stdio.h" 3 4
>extern int fcloseall (void);
># 234 "/usr/include/stdio.h" 3 4
>extern FILE *fopen (const char *__restrict __filename,
>      const char *__restrict __modes) ;
>
>
>
>
>extern FILE *freopen (const char *__restrict __filename,
>        const char *__restrict __modes,
>        FILE *__restrict __stream) ;
># 258 "/usr/include/stdio.h" 3 4
>extern FILE *fopen64 (const char *__restrict __filename,
>        const char *__restrict __modes) ;
>extern FILE *freopen64 (const char *__restrict __filename,
>   const char *__restrict __modes,
>   FILE *__restrict __stream) ;
>
>
>
>
>extern FILE *fdopen (int __fd, const char *__modes) throw () ;
>
>
>
>
>
>extern FILE *fopencookie (void *__restrict __magic_cookie,
>     const char *__restrict __modes,
>     cookie_io_functions_t __io_funcs) throw () ;
>
>
>
>
>extern FILE *fmemopen (void *__s, size_t __len, const char *__modes)
>  throw () ;
>
>
>
>
>extern FILE *open_memstream (char **__bufloc, size_t *__sizeloc) throw () ;
>
>
>
>
>
>extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) throw ();
>
>
>
>extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf,
>      int __modes, size_t __n) throw ();
>
>
>
>
>extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf,
>         size_t __size) throw ();
>
>
>extern void setlinebuf (FILE *__stream) throw ();
>
>
>
>
>
>
>
>extern int fprintf (FILE *__restrict __stream,
>      const char *__restrict __format, ...);
>
>
>
>
>extern int printf (const char *__restrict __format, ...);
>
>extern int sprintf (char *__restrict __s,
>      const char *__restrict __format, ...) throw ();
>
>
>
>
>
>extern int vfprintf (FILE *__restrict __s, const char *__restrict __format,
>       __gnuc_va_list __arg);
>
>
>
>
>extern int vprintf (const char *__restrict __format, __gnuc_va_list __arg);
>
>extern int vsprintf (char *__restrict __s, const char *__restrict __format,
>       __gnuc_va_list __arg) throw ();
>
>
>
>extern int snprintf (char *__restrict __s, size_t __maxlen,
>       const char *__restrict __format, ...)
>     throw () __attribute__ ((__format__ (__printf__, 3, 4)));
>
>extern int vsnprintf (char *__restrict __s, size_t __maxlen,
>        const char *__restrict __format, __gnuc_va_list __arg)
>     throw () __attribute__ ((__format__ (__printf__, 3, 0)));
>
>
>
>
>
>extern int vasprintf (char **__restrict __ptr, const char *__restrict __f,
>        __gnuc_va_list __arg)
>     throw () __attribute__ ((__format__ (__printf__, 2, 0))) ;
>extern int __asprintf (char **__restrict __ptr,
>         const char *__restrict __fmt, ...)
>     throw () __attribute__ ((__format__ (__printf__, 2, 3))) ;
>extern int asprintf (char **__restrict __ptr,
>       const char *__restrict __fmt, ...)
>     throw () __attribute__ ((__format__ (__printf__, 2, 3))) ;
>
>
>
>
>extern int vdprintf (int __fd, const char *__restrict __fmt,
>       __gnuc_va_list __arg)
>     __attribute__ ((__format__ (__printf__, 2, 0)));
>extern int dprintf (int __fd, const char *__restrict __fmt, ...)
>     __attribute__ ((__format__ (__printf__, 2, 3)));
>
>
>
>
>
>
>
>extern int fscanf (FILE *__restrict __stream,
>     const char *__restrict __format, ...) ;
>
>
>
>
>extern int scanf (const char *__restrict __format, ...) ;
>
>extern int sscanf (const char *__restrict __s,
>     const char *__restrict __format, ...) throw ();
># 422 "/usr/include/stdio.h" 3 4
>extern int vfscanf (FILE *__restrict __s, const char *__restrict __format,
>      __gnuc_va_list __arg)
>     __attribute__ ((__format__ (__scanf__, 2, 0))) ;
>
>
>
>
>
>extern int vscanf (const char *__restrict __format, __gnuc_va_list __arg)
>     __attribute__ ((__format__ (__scanf__, 1, 0))) ;
>
>
>extern int vsscanf (const char *__restrict __s,
>      const char *__restrict __format, __gnuc_va_list __arg)
>     throw () __attribute__ ((__format__ (__scanf__, 2, 0)));
># 479 "/usr/include/stdio.h" 3 4
>extern int fgetc (FILE *__stream);
>extern int getc (FILE *__stream);
>
>
>
>
>
>extern int getchar (void);
>
>
>
>
>
>
>extern int getc_unlocked (FILE *__stream);
>extern int getchar_unlocked (void);
># 504 "/usr/include/stdio.h" 3 4
>extern int fgetc_unlocked (FILE *__stream);
># 515 "/usr/include/stdio.h" 3 4
>extern int fputc (int __c, FILE *__stream);
>extern int putc (int __c, FILE *__stream);
>
>
>
>
>
>extern int putchar (int __c);
># 531 "/usr/include/stdio.h" 3 4
>extern int fputc_unlocked (int __c, FILE *__stream);
>
>
>
>
>
>
>
>extern int putc_unlocked (int __c, FILE *__stream);
>extern int putchar_unlocked (int __c);
>
>
>
>
>
>
>extern int getw (FILE *__stream);
>
>
>extern int putw (int __w, FILE *__stream);
>
>
>
>
>
>
>
>extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
>     ;
># 581 "/usr/include/stdio.h" 3 4
>extern char *fgets_unlocked (char *__restrict __s, int __n,
>        FILE *__restrict __stream) ;
># 597 "/usr/include/stdio.h" 3 4
>extern __ssize_t __getdelim (char **__restrict __lineptr,
>                             size_t *__restrict __n, int __delimiter,
>                             FILE *__restrict __stream) ;
>extern __ssize_t getdelim (char **__restrict __lineptr,
>                           size_t *__restrict __n, int __delimiter,
>                           FILE *__restrict __stream) ;
>
>
>
>
>
>
>
>extern __ssize_t getline (char **__restrict __lineptr,
>                          size_t *__restrict __n,
>                          FILE *__restrict __stream) ;
>
>
>
>
>
>
>
>extern int fputs (const char *__restrict __s, FILE *__restrict __stream);
>
>
>
>
>
>extern int puts (const char *__s);
>
>
>
>
>
>
>extern int ungetc (int __c, FILE *__stream);
>
>
>
>
>
>
>extern size_t fread (void *__restrict __ptr, size_t __size,
>       size_t __n, FILE *__restrict __stream) ;
>
>
>
>
>extern size_t fwrite (const void *__restrict __ptr, size_t __size,
>        size_t __n, FILE *__restrict __s);
># 656 "/usr/include/stdio.h" 3 4
>extern int fputs_unlocked (const char *__restrict __s,
>      FILE *__restrict __stream);
># 667 "/usr/include/stdio.h" 3 4
>extern size_t fread_unlocked (void *__restrict __ptr, size_t __size,
>         size_t __n, FILE *__restrict __stream) ;
>extern size_t fwrite_unlocked (const void *__restrict __ptr, size_t __size,
>          size_t __n, FILE *__restrict __stream);
>
>
>
>
>
>
>
>extern int fseek (FILE *__stream, long int __off, int __whence);
>
>
>
>
>extern long int ftell (FILE *__stream) ;
>
>
>
>
>extern void rewind (FILE *__stream);
># 701 "/usr/include/stdio.h" 3 4
>extern int fseeko (FILE *__stream, __off_t __off, int __whence);
>
>
>
>
>extern __off_t ftello (FILE *__stream) ;
># 725 "/usr/include/stdio.h" 3 4
>extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos);
>
>
>
>
>extern int fsetpos (FILE *__stream, const fpos_t *__pos);
># 744 "/usr/include/stdio.h" 3 4
>extern int fseeko64 (FILE *__stream, __off64_t __off, int __whence);
>extern __off64_t ftello64 (FILE *__stream) ;
>extern int fgetpos64 (FILE *__restrict __stream, fpos64_t *__restrict __pos);
>extern int fsetpos64 (FILE *__stream, const fpos64_t *__pos);
>
>
>
>extern void clearerr (FILE *__stream) throw ();
>
>extern int feof (FILE *__stream) throw () ;
>
>extern int ferror (FILE *__stream) throw () ;
>
>
>
>extern void clearerr_unlocked (FILE *__stream) throw ();
>extern int feof_unlocked (FILE *__stream) throw () ;
>extern int ferror_unlocked (FILE *__stream) throw () ;
>
>
>
>
>
>
>
>extern void perror (const char *__s);
>
>
>
>
>
># 1 "/usr/include/bits/sys_errlist.h" 1 3 4
># 26 "/usr/include/bits/sys_errlist.h" 3 4
>extern int sys_nerr;
>extern const char *const sys_errlist[];
>
>
>extern int _sys_nerr;
>extern const char *const _sys_errlist[];
># 776 "/usr/include/stdio.h" 2 3 4
>
>
>
>
>extern int fileno (FILE *__stream) throw () ;
>
>
>
>
>extern int fileno_unlocked (FILE *__stream) throw () ;
># 794 "/usr/include/stdio.h" 3 4
>extern FILE *popen (const char *__command, const char *__modes) ;
>
>
>
>
>
>extern int pclose (FILE *__stream);
>
>
>
>
>
>extern char *ctermid (char *__s) throw ();
>
>
>
>
>
>extern char *cuserid (char *__s);
>
>
>
>
>struct obstack;
>
>
>extern int obstack_printf (struct obstack *__restrict __obstack,
>      const char *__restrict __format, ...)
>     throw () __attribute__ ((__format__ (__printf__, 2, 3)));
>extern int obstack_vprintf (struct obstack *__restrict __obstack,
>       const char *__restrict __format,
>       __gnuc_va_list __args)
>     throw () __attribute__ ((__format__ (__printf__, 2, 0)));
>
>
>
>
>
>
>
>extern void flockfile (FILE *__stream) throw ();
>
>
>
>extern int ftrylockfile (FILE *__stream) throw () ;
>
>
>extern void funlockfile (FILE *__stream) throw ();
># 852 "/usr/include/stdio.h" 3 4
>extern int __uflow (FILE *);
>extern int __overflow (FILE *, int);
># 867 "/usr/include/stdio.h" 3 4
>}
># 43 "/usr/include/c++/8/cstdio" 2 3
># 96 "/usr/include/c++/8/cstdio" 3
>namespace std
>{
>  using ::FILE;
>  using ::fpos_t;
>
>  using ::clearerr;
>  using ::fclose;
>  using ::feof;
>  using ::ferror;
>  using ::fflush;
>  using ::fgetc;
>  using ::fgetpos;
>  using ::fgets;
>  using ::fopen;
>  using ::fprintf;
>  using ::fputc;
>  using ::fputs;
>  using ::fread;
>  using ::freopen;
>  using ::fscanf;
>  using ::fseek;
>  using ::fsetpos;
>  using ::ftell;
>  using ::fwrite;
>  using ::getc;
>  using ::getchar;
>
>
>
>
>  using ::perror;
>  using ::printf;
>  using ::putc;
>  using ::putchar;
>  using ::puts;
>  using ::remove;
>  using ::rename;
>  using ::rewind;
>  using ::scanf;
>  using ::setbuf;
>  using ::setvbuf;
>  using ::sprintf;
>  using ::sscanf;
>  using ::tmpfile;
>
>  using ::tmpnam;
>
>  using ::ungetc;
>  using ::vfprintf;
>  using ::vprintf;
>  using ::vsprintf;
>}
># 157 "/usr/include/c++/8/cstdio" 3
>namespace __gnu_cxx
>{
># 175 "/usr/include/c++/8/cstdio" 3
>  using ::snprintf;
>  using ::vfscanf;
>  using ::vscanf;
>  using ::vsnprintf;
>  using ::vsscanf;
>
>}
>
>namespace std
>{
>  using ::__gnu_cxx::snprintf;
>  using ::__gnu_cxx::vfscanf;
>  using ::__gnu_cxx::vscanf;
>  using ::__gnu_cxx::vsnprintf;
>  using ::__gnu_cxx::vsscanf;
>}
># 44 "/usr/include/c++/8/ext/string_conversions.h" 2 3
># 1 "/usr/include/c++/8/cerrno" 1 3
># 39 "/usr/include/c++/8/cerrno" 3
>       
># 40 "/usr/include/c++/8/cerrno" 3
>
>
># 1 "/usr/include/errno.h" 1 3 4
># 28 "/usr/include/errno.h" 3 4
># 1 "/usr/include/bits/errno.h" 1 3 4
># 26 "/usr/include/bits/errno.h" 3 4
># 1 "/usr/include/linux/errno.h" 1 3 4
># 1 "/usr/include/asm/errno.h" 1 3 4
># 1 "/usr/include/asm-generic/errno.h" 1 3 4
>
>
>
>
># 1 "/usr/include/asm-generic/errno-base.h" 1 3 4
># 6 "/usr/include/asm-generic/errno.h" 2 3 4
># 1 "/usr/include/asm/errno.h" 2 3 4
># 1 "/usr/include/linux/errno.h" 2 3 4
># 27 "/usr/include/bits/errno.h" 2 3 4
># 29 "/usr/include/errno.h" 2 3 4
>
>
>
>
>
>extern "C" {
>
>
>extern int *__errno_location (void) throw () __attribute__ ((__const__));
>
>
>
>
>
>
>
>extern char *program_invocation_name;
>extern char *program_invocation_short_name;
>
># 1 "/usr/include/bits/types/error_t.h" 1 3 4
># 22 "/usr/include/bits/types/error_t.h" 3 4
>typedef int error_t;
># 49 "/usr/include/errno.h" 2 3 4
>
>
>
>}
># 43 "/usr/include/c++/8/cerrno" 2 3
># 45 "/usr/include/c++/8/ext/string_conversions.h" 2 3
>
>namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>  template<typename _TRet, typename _Ret = _TRet, typename _CharT,
>    typename... _Base>
>    _Ret
>    __stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...),
>    const char* __name, const _CharT* __str, std::size_t* __idx,
>    _Base... __base)
>    {
>      _Ret __ret;
>
>      _CharT* __endptr;
>
>      struct _Save_errno {
> _Save_errno() : _M_errno((*__errno_location ())) { (*__errno_location ()) = 0; }
> ~_Save_errno() { if ((*__errno_location ()) == 0) (*__errno_location ()) = _M_errno; }
> int _M_errno;
>      } const __save_errno;
>
>      struct _Range_chk {
>   static bool
>   _S_chk(_TRet, std::false_type) { return false; }
>
>   static bool
>   _S_chk(_TRet __val, std::true_type)
>   {
>     return __val < _TRet(__numeric_traits<int>::__min)
>       || __val > _TRet(__numeric_traits<int>::__max);
>   }
>      };
>
>      const _TRet __tmp = __convf(__str, &__endptr, __base...);
>
>      if (__endptr == __str)
> std::__throw_invalid_argument(__name);
>      else if ((*__errno_location ()) == 34
>   || _Range_chk::_S_chk(__tmp, std::is_same<_Ret, int>{}))
> std::__throw_out_of_range(__name);
>      else
> __ret = __tmp;
>
>      if (__idx)
> *__idx = __endptr - __str;
>
>      return __ret;
>    }
>
>
>  template<typename _String, typename _CharT = typename _String::value_type>
>    _String
>    __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*,
>     __builtin_va_list), std::size_t __n,
>   const _CharT* __fmt, ...)
>    {
>
>
>      _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
>         * __n));
>
>      __builtin_va_list __args;
>      __builtin_va_start(__args, __fmt);
>
>      const int __len = __convf(__s, __n, __fmt, __args);
>
>      __builtin_va_end(__args);
>
>      return _String(__s, __s + __len);
>    }
>
>
>}
># 6362 "/usr/include/c++/8/bits/basic_string.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>namespace __cxx11 {
>
>
>
>  inline int
>  stoi(const string& __str, size_t* __idx = 0, int __base = 10)
>  { return __gnu_cxx::__stoa<long, int>(&std::strtol, "stoi", __str.c_str(),
>     __idx, __base); }
>
>  inline long
>  stol(const string& __str, size_t* __idx = 0, int __base = 10)
>  { return __gnu_cxx::__stoa(&std::strtol, "stol", __str.c_str(),
>        __idx, __base); }
>
>  inline unsigned long
>  stoul(const string& __str, size_t* __idx = 0, int __base = 10)
>  { return __gnu_cxx::__stoa(&std::strtoul, "stoul", __str.c_str(),
>        __idx, __base); }
>
>  inline long long
>  stoll(const string& __str, size_t* __idx = 0, int __base = 10)
>  { return __gnu_cxx::__stoa(&std::strtoll, "stoll", __str.c_str(),
>        __idx, __base); }
>
>  inline unsigned long long
>  stoull(const string& __str, size_t* __idx = 0, int __base = 10)
>  { return __gnu_cxx::__stoa(&std::strtoull, "stoull", __str.c_str(),
>        __idx, __base); }
>
>
>  inline float
>  stof(const string& __str, size_t* __idx = 0)
>  { return __gnu_cxx::__stoa(&std::strtof, "stof", __str.c_str(), __idx); }
>
>  inline double
>  stod(const string& __str, size_t* __idx = 0)
>  { return __gnu_cxx::__stoa(&std::strtod, "stod", __str.c_str(), __idx); }
>
>  inline long double
>  stold(const string& __str, size_t* __idx = 0)
>  { return __gnu_cxx::__stoa(&std::strtold, "stold", __str.c_str(), __idx); }
>
>
>
>
>
>
>  inline string
>  to_string(int __val)
>  { return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, 4 * sizeof(int),
>        "%d", __val); }
>
>  inline string
>  to_string(unsigned __val)
>  { return __gnu_cxx::__to_xstring<string>(&std::vsnprintf,
>        4 * sizeof(unsigned),
>        "%u", __val); }
>
>  inline string
>  to_string(long __val)
>  { return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, 4 * sizeof(long),
>        "%ld", __val); }
>
>  inline string
>  to_string(unsigned long __val)
>  { return __gnu_cxx::__to_xstring<string>(&std::vsnprintf,
>        4 * sizeof(unsigned long),
>        "%lu", __val); }
>
>  inline string
>  to_string(long long __val)
>  { return __gnu_cxx::__to_xstring<string>(&std::vsnprintf,
>        4 * sizeof(long long),
>        "%lld", __val); }
>
>  inline string
>  to_string(unsigned long long __val)
>  { return __gnu_cxx::__to_xstring<string>(&std::vsnprintf,
>        4 * sizeof(unsigned long long),
>        "%llu", __val); }
>
>  inline string
>  to_string(float __val)
>  {
>    const int __n =
>      __gnu_cxx::__numeric_traits<float>::__max_exponent10 + 20;
>    return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, __n,
>        "%f", __val);
>  }
>
>  inline string
>  to_string(double __val)
>  {
>    const int __n =
>      __gnu_cxx::__numeric_traits<double>::__max_exponent10 + 20;
>    return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, __n,
>        "%f", __val);
>  }
>
>  inline string
>  to_string(long double __val)
>  {
>    const int __n =
>      __gnu_cxx::__numeric_traits<long double>::__max_exponent10 + 20;
>    return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, __n,
>        "%Lf", __val);
>  }
>
>
>
>  inline int
>  stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
>  { return __gnu_cxx::__stoa<long, int>(&std::wcstol, "stoi", __str.c_str(),
>     __idx, __base); }
>
>  inline long
>  stol(const wstring& __str, size_t* __idx = 0, int __base = 10)
>  { return __gnu_cxx::__stoa(&std::wcstol, "stol", __str.c_str(),
>        __idx, __base); }
>
>  inline unsigned long
>  stoul(const wstring& __str, size_t* __idx = 0, int __base = 10)
>  { return __gnu_cxx::__stoa(&std::wcstoul, "stoul", __str.c_str(),
>        __idx, __base); }
>
>  inline long long
>  stoll(const wstring& __str, size_t* __idx = 0, int __base = 10)
>  { return __gnu_cxx::__stoa(&std::wcstoll, "stoll", __str.c_str(),
>        __idx, __base); }
>
>  inline unsigned long long
>  stoull(const wstring& __str, size_t* __idx = 0, int __base = 10)
>  { return __gnu_cxx::__stoa(&std::wcstoull, "stoull", __str.c_str(),
>        __idx, __base); }
>
>
>  inline float
>  stof(const wstring& __str, size_t* __idx = 0)
>  { return __gnu_cxx::__stoa(&std::wcstof, "stof", __str.c_str(), __idx); }
>
>  inline double
>  stod(const wstring& __str, size_t* __idx = 0)
>  { return __gnu_cxx::__stoa(&std::wcstod, "stod", __str.c_str(), __idx); }
>
>  inline long double
>  stold(const wstring& __str, size_t* __idx = 0)
>  { return __gnu_cxx::__stoa(&std::wcstold, "stold", __str.c_str(), __idx); }
>
>
>
>  inline wstring
>  to_wstring(int __val)
>  { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, 4 * sizeof(int),
>         L"%d", __val); }
>
>  inline wstring
>  to_wstring(unsigned __val)
>  { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf,
>         4 * sizeof(unsigned),
>         L"%u", __val); }
>
>  inline wstring
>  to_wstring(long __val)
>  { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, 4 * sizeof(long),
>         L"%ld", __val); }
>
>  inline wstring
>  to_wstring(unsigned long __val)
>  { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf,
>         4 * sizeof(unsigned long),
>         L"%lu", __val); }
>
>  inline wstring
>  to_wstring(long long __val)
>  { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf,
>         4 * sizeof(long long),
>         L"%lld", __val); }
>
>  inline wstring
>  to_wstring(unsigned long long __val)
>  { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf,
>         4 * sizeof(unsigned long long),
>         L"%llu", __val); }
>
>  inline wstring
>  to_wstring(float __val)
>  {
>    const int __n =
>      __gnu_cxx::__numeric_traits<float>::__max_exponent10 + 20;
>    return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, __n,
>         L"%f", __val);
>  }
>
>  inline wstring
>  to_wstring(double __val)
>  {
>    const int __n =
>      __gnu_cxx::__numeric_traits<double>::__max_exponent10 + 20;
>    return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, __n,
>         L"%f", __val);
>  }
>
>  inline wstring
>  to_wstring(long double __val)
>  {
>    const int __n =
>      __gnu_cxx::__numeric_traits<long double>::__max_exponent10 + 20;
>    return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, __n,
>         L"%Lf", __val);
>  }
>
>
>
>}
>
>}
>
>
>
>
>
># 1 "/usr/include/c++/8/bits/functional_hash.h" 1 3
># 33 "/usr/include/c++/8/bits/functional_hash.h" 3
>       
># 34 "/usr/include/c++/8/bits/functional_hash.h" 3
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 49 "/usr/include/c++/8/bits/functional_hash.h" 3
>  template<typename _Result, typename _Arg>
>    struct __hash_base
>    {
>      typedef _Result result_type ;
>      typedef _Arg argument_type ;
>    };
>
>
>  template<typename _Tp>
>    struct hash;
>
>  template<typename _Tp, typename = void>
>    struct __poison_hash
>    {
>      static constexpr bool __enable_hash_call = false;
>    private:
>
>      __poison_hash(__poison_hash&&);
>      ~__poison_hash();
>    };
>
>  template<typename _Tp>
>    struct __poison_hash<_Tp, __void_t<decltype(hash<_Tp>()(declval<_Tp>()))>>
>    {
>      static constexpr bool __enable_hash_call = true;
>    };
>
>
>  template<typename _Tp, bool = is_enum<_Tp>::value>
>    struct __hash_enum
>    {
>    private:
>
>      __hash_enum(__hash_enum&&);
>      ~__hash_enum();
>    };
>
>
>  template<typename _Tp>
>    struct __hash_enum<_Tp, true> : public __hash_base<size_t, _Tp>
>    {
>      size_t
>      operator()(_Tp __val) const noexcept
>      {
>       using __type = typename underlying_type<_Tp>::type;
>       return hash<__type>{}(static_cast<__type>(__val));
>      }
>    };
>
>
>
>  template<typename _Tp>
>    struct hash : __hash_enum<_Tp>
>    { };
>
>
>  template<typename _Tp>
>    struct hash<_Tp*> : public __hash_base<size_t, _Tp*>
>    {
>      size_t
>      operator()(_Tp* __p) const noexcept
>      { return reinterpret_cast<size_t>(__p); }
>    };
># 124 "/usr/include/c++/8/bits/functional_hash.h" 3
>  template<> struct hash<bool> : public __hash_base<size_t, bool> { size_t operator()(bool __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<char> : public __hash_base<size_t, char> { size_t operator()(char __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<signed char> : public __hash_base<size_t, signed char> { size_t operator()(signed char __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<unsigned char> : public __hash_base<size_t, unsigned char> { size_t operator()(unsigned char __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<wchar_t> : public __hash_base<size_t, wchar_t> { size_t operator()(wchar_t __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<char16_t> : public __hash_base<size_t, char16_t> { size_t operator()(char16_t __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<char32_t> : public __hash_base<size_t, char32_t> { size_t operator()(char32_t __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<short> : public __hash_base<size_t, short> { size_t operator()(short __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<int> : public __hash_base<size_t, int> { size_t operator()(int __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<long> : public __hash_base<size_t, long> { size_t operator()(long __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<long long> : public __hash_base<size_t, long long> { size_t operator()(long long __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<unsigned short> : public __hash_base<size_t, unsigned short> { size_t operator()(unsigned short __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<unsigned int> : public __hash_base<size_t, unsigned int> { size_t operator()(unsigned int __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<unsigned long> : public __hash_base<size_t, unsigned long> { size_t operator()(unsigned long __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<unsigned long long> : public __hash_base<size_t, unsigned long long> { size_t operator()(unsigned long long __val) const noexcept { return static_cast<size_t>(__val); } };
>
>
>  template<> struct hash<__int128> : public __hash_base<size_t, __int128> { size_t operator()(__int128 __val) const noexcept { return static_cast<size_t>(__val); } };
>  template<> struct hash<__int128 unsigned> : public __hash_base<size_t, __int128 unsigned> { size_t operator()(__int128 unsigned __val) const noexcept { return static_cast<size_t>(__val); } };
># 187 "/usr/include/c++/8/bits/functional_hash.h" 3
>  struct _Hash_impl
>  {
>    static size_t
>    hash(const void* __ptr, size_t __clength,
>  size_t __seed = static_cast<size_t>(0xc70f6907UL))
>    { return _Hash_bytes(__ptr, __clength, __seed); }
>
>    template<typename _Tp>
>      static size_t
>      hash(const _Tp& __val)
>      { return hash(&__val, sizeof(__val)); }
>
>    template<typename _Tp>
>      static size_t
>      __hash_combine(const _Tp& __val, size_t __hash)
>      { return hash(&__val, sizeof(__val), __hash); }
>  };
>
>
>  struct _Fnv_hash_impl
>  {
>    static size_t
>    hash(const void* __ptr, size_t __clength,
>  size_t __seed = static_cast<size_t>(2166136261UL))
>    { return _Fnv_hash_bytes(__ptr, __clength, __seed); }
>
>    template<typename _Tp>
>      static size_t
>      hash(const _Tp& __val)
>      { return hash(&__val, sizeof(__val)); }
>
>    template<typename _Tp>
>      static size_t
>      __hash_combine(const _Tp& __val, size_t __hash)
>      { return hash(&__val, sizeof(__val), __hash); }
>  };
>
>
>  template<>
>    struct hash<float> : public __hash_base<size_t, float>
>    {
>      size_t
>      operator()(float __val) const noexcept
>      {
>
> return __val != 0.0f ? std::_Hash_impl::hash(__val) : 0;
>      }
>    };
>
>
>  template<>
>    struct hash<double> : public __hash_base<size_t, double>
>    {
>      size_t
>      operator()(double __val) const noexcept
>      {
>
> return __val != 0.0 ? std::_Hash_impl::hash(__val) : 0;
>      }
>    };
>
>
>  template<>
>    struct hash<long double>
>    : public __hash_base<size_t, long double>
>    {
>      __attribute__ ((__pure__)) size_t
>      operator()(long double __val) const noexcept;
>    };
>
>
>
>
>
>
>
>  template<typename _Hash>
>    struct __is_fast_hash : public std::true_type
>    { };
>
>  template<>
>    struct __is_fast_hash<hash<long double>> : public std::false_type
>    { };
>
>
>}
># 6588 "/usr/include/c++/8/bits/basic_string.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>
>
>  template<>
>    struct hash<string>
>    : public __hash_base<size_t, string>
>    {
>      size_t
>      operator()(const string& __s) const noexcept
>      { return std::_Hash_impl::hash(__s.data(), __s.length()); }
>    };
>
>  template<>
>    struct __is_fast_hash<hash<string>> : std::false_type
>    { };
>
>
>
>  template<>
>    struct hash<wstring>
>    : public __hash_base<size_t, wstring>
>    {
>      size_t
>      operator()(const wstring& __s) const noexcept
>      { return std::_Hash_impl::hash(__s.data(),
>                                     __s.length() * sizeof(wchar_t)); }
>    };
>
>  template<>
>    struct __is_fast_hash<hash<wstring>> : std::false_type
>    { };
>
>
>
>
>
>  template<>
>    struct hash<u16string>
>    : public __hash_base<size_t, u16string>
>    {
>      size_t
>      operator()(const u16string& __s) const noexcept
>      { return std::_Hash_impl::hash(__s.data(),
>                                     __s.length() * sizeof(char16_t)); }
>    };
>
>  template<>
>    struct __is_fast_hash<hash<u16string>> : std::false_type
>    { };
>
>
>  template<>
>    struct hash<u32string>
>    : public __hash_base<size_t, u32string>
>    {
>      size_t
>      operator()(const u32string& __s) const noexcept
>      { return std::_Hash_impl::hash(__s.data(),
>                                     __s.length() * sizeof(char32_t)); }
>    };
>
>  template<>
>    struct __is_fast_hash<hash<u32string>> : std::false_type
>    { };
>
>
>
>
>
>
>  inline namespace literals
>  {
>  inline namespace string_literals
>  {
>#pragma GCC diagnostic push
>#pragma GCC diagnostic ignored "-Wliteral-suffix"
>    __attribute ((__abi_tag__ ("cxx11")))
>    inline basic_string<char>
>    operator""s(const char* __str, size_t __len)
>    { return basic_string<char>{__str, __len}; }
>
>
>    __attribute ((__abi_tag__ ("cxx11")))
>    inline basic_string<wchar_t>
>    operator""s(const wchar_t* __str, size_t __len)
>    { return basic_string<wchar_t>{__str, __len}; }
>
>
>
>    __attribute ((__abi_tag__ ("cxx11")))
>    inline basic_string<char16_t>
>    operator""s(const char16_t* __str, size_t __len)
>    { return basic_string<char16_t>{__str, __len}; }
>
>    __attribute ((__abi_tag__ ("cxx11")))
>    inline basic_string<char32_t>
>    operator""s(const char32_t* __str, size_t __len)
>    { return basic_string<char32_t>{__str, __len}; }
>
>
>#pragma GCC diagnostic pop
>  }
>  }
>
>
>
>
>}
># 53 "/usr/include/c++/8/string" 2 3
># 1 "/usr/include/c++/8/bits/basic_string.tcc" 1 3
># 42 "/usr/include/c++/8/bits/basic_string.tcc" 3
>       
># 43 "/usr/include/c++/8/bits/basic_string.tcc" 3
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    const typename basic_string<_CharT, _Traits, _Alloc>::size_type
>    basic_string<_CharT, _Traits, _Alloc>::npos;
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    void
>    basic_string<_CharT, _Traits, _Alloc>::
>    swap(basic_string& __s) noexcept
>    {
>      if (this == &__s)
> return;
>
>      _Alloc_traits::_S_on_swap(_M_get_allocator(), __s._M_get_allocator());
>
>      if (_M_is_local())
> if (__s._M_is_local())
>   {
>     if (length() && __s.length())
>       {
>  _CharT __tmp_data[_S_local_capacity + 1];
>  traits_type::copy(__tmp_data, __s._M_local_buf,
>      _S_local_capacity + 1);
>  traits_type::copy(__s._M_local_buf, _M_local_buf,
>      _S_local_capacity + 1);
>  traits_type::copy(_M_local_buf, __tmp_data,
>      _S_local_capacity + 1);
>       }
>     else if (__s.length())
>       {
>  traits_type::copy(_M_local_buf, __s._M_local_buf,
>      _S_local_capacity + 1);
>  _M_length(__s.length());
>  __s._M_set_length(0);
>  return;
>       }
>     else if (length())
>       {
>  traits_type::copy(__s._M_local_buf, _M_local_buf,
>      _S_local_capacity + 1);
>  __s._M_length(length());
>  _M_set_length(0);
>  return;
>       }
>   }
> else
>   {
>     const size_type __tmp_capacity = __s._M_allocated_capacity;
>     traits_type::copy(__s._M_local_buf, _M_local_buf,
>         _S_local_capacity + 1);
>     _M_data(__s._M_data());
>     __s._M_data(__s._M_local_buf);
>     _M_capacity(__tmp_capacity);
>   }
>      else
> {
>   const size_type __tmp_capacity = _M_allocated_capacity;
>   if (__s._M_is_local())
>     {
>       traits_type::copy(_M_local_buf, __s._M_local_buf,
>    _S_local_capacity + 1);
>       __s._M_data(_M_data());
>       _M_data(_M_local_buf);
>     }
>   else
>     {
>       pointer __tmp_ptr = _M_data();
>       _M_data(__s._M_data());
>       __s._M_data(__tmp_ptr);
>       _M_capacity(__s._M_allocated_capacity);
>     }
>   __s._M_capacity(__tmp_capacity);
> }
>
>      const size_type __tmp_length = length();
>      _M_length(__s.length());
>      __s._M_length(__tmp_length);
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    typename basic_string<_CharT, _Traits, _Alloc>::pointer
>    basic_string<_CharT, _Traits, _Alloc>::
>    _M_create(size_type& __capacity, size_type __old_capacity)
>    {
>
>
>      if (__capacity > max_size())
> std::__throw_length_error(("basic_string::_M_create"));
>
>
>
>
>      if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
> {
>   __capacity = 2 * __old_capacity;
>
>   if (__capacity > max_size())
>     __capacity = max_size();
> }
>
>
>
>      return _Alloc_traits::allocate(_M_get_allocator(), __capacity + 1);
>    }
>
>
>
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    template<typename _InIterator>
>      void
>      basic_string<_CharT, _Traits, _Alloc>::
>      _M_construct(_InIterator __beg, _InIterator __end,
>     std::input_iterator_tag)
>      {
> size_type __len = 0;
> size_type __capacity = size_type(_S_local_capacity);
>
> while (__beg != __end && __len < __capacity)
>   {
>     _M_data()[__len++] = *__beg;
>     ++__beg;
>   }
>
> try
>   {
>     while (__beg != __end)
>       {
>  if (__len == __capacity)
>    {
>
>      __capacity = __len + 1;
>      pointer __another = _M_create(__capacity, __len);
>      this->_S_copy(__another, _M_data(), __len);
>      _M_dispose();
>      _M_data(__another);
>      _M_capacity(__capacity);
>    }
>  _M_data()[__len++] = *__beg;
>  ++__beg;
>       }
>   }
> catch(...)
>   {
>     _M_dispose();
>     throw;
>   }
>
> _M_set_length(__len);
>      }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    template<typename _InIterator>
>      void
>      basic_string<_CharT, _Traits, _Alloc>::
>      _M_construct(_InIterator __beg, _InIterator __end,
>     std::forward_iterator_tag)
>      {
>
> if (__gnu_cxx::__is_null_pointer(__beg) && __beg != __end)
>   std::__throw_logic_error(("basic_string::" "_M_construct null not valid")
>                                         );
>
> size_type __dnew = static_cast<size_type>(std::distance(__beg, __end));
>
> if (__dnew > size_type(_S_local_capacity))
>   {
>     _M_data(_M_create(__dnew, size_type(0)));
>     _M_capacity(__dnew);
>   }
>
>
> try
>   { this->_S_copy_chars(_M_data(), __beg, __end); }
> catch(...)
>   {
>     _M_dispose();
>     throw;
>   }
>
> _M_set_length(__dnew);
>      }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    void
>    basic_string<_CharT, _Traits, _Alloc>::
>    _M_construct(size_type __n, _CharT __c)
>    {
>      if (__n > size_type(_S_local_capacity))
> {
>   _M_data(_M_create(__n, size_type(0)));
>   _M_capacity(__n);
> }
>
>      if (__n)
> this->_S_assign(_M_data(), __n, __c);
>
>      _M_set_length(__n);
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    void
>    basic_string<_CharT, _Traits, _Alloc>::
>    _M_assign(const basic_string& __str)
>    {
>      if (this != &__str)
> {
>   const size_type __rsize = __str.length();
>   const size_type __capacity = capacity();
>
>   if (__rsize > __capacity)
>     {
>       size_type __new_capacity = __rsize;
>       pointer __tmp = _M_create(__new_capacity, __capacity);
>       _M_dispose();
>       _M_data(__tmp);
>       _M_capacity(__new_capacity);
>     }
>
>   if (__rsize)
>     this->_S_copy(_M_data(), __str._M_data(), __rsize);
>
>   _M_set_length(__rsize);
> }
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    void
>    basic_string<_CharT, _Traits, _Alloc>::
>    reserve(size_type __res)
>    {
>
>      if (__res < length())
> __res = length();
>
>      const size_type __capacity = capacity();
>      if (__res != __capacity)
> {
>   if (__res > __capacity
>       || __res > size_type(_S_local_capacity))
>     {
>       pointer __tmp = _M_create(__res, __capacity);
>       this->_S_copy(__tmp, _M_data(), length() + 1);
>       _M_dispose();
>       _M_data(__tmp);
>       _M_capacity(__res);
>     }
>   else if (!_M_is_local())
>     {
>       this->_S_copy(_M_local_data(), _M_data(), length() + 1);
>       _M_destroy(__capacity);
>       _M_data(_M_local_data());
>     }
> }
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    void
>    basic_string<_CharT, _Traits, _Alloc>::
>    _M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
>       size_type __len2)
>    {
>      const size_type __how_much = length() - __pos - __len1;
>
>      size_type __new_capacity = length() + __len2 - __len1;
>      pointer __r = _M_create(__new_capacity, capacity());
>
>      if (__pos)
> this->_S_copy(__r, _M_data(), __pos);
>      if (__s && __len2)
> this->_S_copy(__r + __pos, __s, __len2);
>      if (__how_much)
> this->_S_copy(__r + __pos + __len2,
>        _M_data() + __pos + __len1, __how_much);
>
>      _M_dispose();
>      _M_data(__r);
>      _M_capacity(__new_capacity);
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    void
>    basic_string<_CharT, _Traits, _Alloc>::
>    _M_erase(size_type __pos, size_type __n)
>    {
>      const size_type __how_much = length() - __pos - __n;
>
>      if (__how_much && __n)
> this->_S_move(_M_data() + __pos, _M_data() + __pos + __n, __how_much);
>
>      _M_set_length(length() - __n);
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    void
>    basic_string<_CharT, _Traits, _Alloc>::
>    resize(size_type __n, _CharT __c)
>    {
>      const size_type __size = this->size();
>      if (__size < __n)
> this->append(__n - __size, __c);
>      else if (__n < __size)
> this->_M_set_length(__n);
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    basic_string<_CharT, _Traits, _Alloc>&
>    basic_string<_CharT, _Traits, _Alloc>::
>    _M_append(const _CharT* __s, size_type __n)
>    {
>      const size_type __len = __n + this->size();
>
>      if (__len <= this->capacity())
> {
>   if (__n)
>     this->_S_copy(this->_M_data() + this->size(), __s, __n);
> }
>      else
> this->_M_mutate(this->size(), size_type(0), __s, __n);
>
>      this->_M_set_length(__len);
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    template<typename _InputIterator>
>      basic_string<_CharT, _Traits, _Alloc>&
>      basic_string<_CharT, _Traits, _Alloc>::
>      _M_replace_dispatch(const_iterator __i1, const_iterator __i2,
>     _InputIterator __k1, _InputIterator __k2,
>     std::__false_type)
>      {
> const basic_string __s(__k1, __k2);
> const size_type __n1 = __i2 - __i1;
> return _M_replace(__i1 - begin(), __n1, __s._M_data(),
>     __s.size());
>      }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    basic_string<_CharT, _Traits, _Alloc>&
>    basic_string<_CharT, _Traits, _Alloc>::
>    _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
>     _CharT __c)
>    {
>      _M_check_length(__n1, __n2, "basic_string::_M_replace_aux");
>
>      const size_type __old_size = this->size();
>      const size_type __new_size = __old_size + __n2 - __n1;
>
>      if (__new_size <= this->capacity())
> {
>   pointer __p = this->_M_data() + __pos1;
>
>   const size_type __how_much = __old_size - __pos1 - __n1;
>   if (__how_much && __n1 != __n2)
>     this->_S_move(__p + __n2, __p + __n1, __how_much);
> }
>      else
> this->_M_mutate(__pos1, __n1, 0, __n2);
>
>      if (__n2)
> this->_S_assign(this->_M_data() + __pos1, __n2, __c);
>
>      this->_M_set_length(__new_size);
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    basic_string<_CharT, _Traits, _Alloc>&
>    basic_string<_CharT, _Traits, _Alloc>::
>    _M_replace(size_type __pos, size_type __len1, const _CharT* __s,
>        const size_type __len2)
>    {
>      _M_check_length(__len1, __len2, "basic_string::_M_replace");
>
>      const size_type __old_size = this->size();
>      const size_type __new_size = __old_size + __len2 - __len1;
>
>      if (__new_size <= this->capacity())
> {
>   pointer __p = this->_M_data() + __pos;
>
>   const size_type __how_much = __old_size - __pos - __len1;
>   if (_M_disjunct(__s))
>     {
>       if (__how_much && __len1 != __len2)
>  this->_S_move(__p + __len2, __p + __len1, __how_much);
>       if (__len2)
>  this->_S_copy(__p, __s, __len2);
>     }
>   else
>     {
>
>       if (__len2 && __len2 <= __len1)
>  this->_S_move(__p, __s, __len2);
>       if (__how_much && __len1 != __len2)
>  this->_S_move(__p + __len2, __p + __len1, __how_much);
>       if (__len2 > __len1)
>  {
>    if (__s + __len2 <= __p + __len1)
>      this->_S_move(__p, __s, __len2);
>    else if (__s >= __p + __len1)
>      this->_S_copy(__p, __s + __len2 - __len1, __len2);
>    else
>      {
>        const size_type __nleft = (__p + __len1) - __s;
>        this->_S_move(__p, __s, __nleft);
>        this->_S_copy(__p + __nleft, __p + __len2,
>        __len2 - __nleft);
>      }
>  }
>     }
> }
>      else
> this->_M_mutate(__pos, __len1, __s, __len2);
>
>      this->_M_set_length(__new_size);
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    typename basic_string<_CharT, _Traits, _Alloc>::size_type
>    basic_string<_CharT, _Traits, _Alloc>::
>    copy(_CharT* __s, size_type __n, size_type __pos) const
>    {
>      _M_check(__pos, "basic_string::copy");
>      __n = _M_limit(__pos, __n);
>      ;
>      if (__n)
> _S_copy(__s, _M_data() + __pos, __n);
>
>      return __n;
>    }
># 1155 "/usr/include/c++/8/bits/basic_string.tcc" 3
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    basic_string<_CharT, _Traits, _Alloc>
>    operator+(const _CharT* __lhs,
>       const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    {
>      ;
>      typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
>      typedef typename __string_type::size_type __size_type;
>      const __size_type __len = _Traits::length(__lhs);
>      __string_type __str;
>      __str.reserve(__len + __rhs.size());
>      __str.append(__lhs, __len);
>      __str.append(__rhs);
>      return __str;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    basic_string<_CharT, _Traits, _Alloc>
>    operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
>    {
>      typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
>      typedef typename __string_type::size_type __size_type;
>      __string_type __str;
>      const __size_type __len = __rhs.size();
>      __str.reserve(__len + 1);
>      __str.append(__size_type(1), __lhs);
>      __str.append(__rhs);
>      return __str;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    typename basic_string<_CharT, _Traits, _Alloc>::size_type
>    basic_string<_CharT, _Traits, _Alloc>::
>    find(const _CharT* __s, size_type __pos, size_type __n) const
>    noexcept
>    {
>      ;
>      const size_type __size = this->size();
>
>      if (__n == 0)
> return __pos <= __size ? __pos : npos;
>      if (__pos >= __size)
> return npos;
>
>      const _CharT __elem0 = __s[0];
>      const _CharT* const __data = data();
>      const _CharT* __first = __data + __pos;
>      const _CharT* const __last = __data + __size;
>      size_type __len = __size - __pos;
>
>      while (__len >= __n)
> {
>
>   __first = traits_type::find(__first, __len - __n + 1, __elem0);
>   if (!__first)
>     return npos;
>
>
>
>   if (traits_type::compare(__first, __s, __n) == 0)
>     return __first - __data;
>   __len = __last - ++__first;
> }
>      return npos;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    typename basic_string<_CharT, _Traits, _Alloc>::size_type
>    basic_string<_CharT, _Traits, _Alloc>::
>    find(_CharT __c, size_type __pos) const noexcept
>    {
>      size_type __ret = npos;
>      const size_type __size = this->size();
>      if (__pos < __size)
> {
>   const _CharT* __data = _M_data();
>   const size_type __n = __size - __pos;
>   const _CharT* __p = traits_type::find(__data + __pos, __n, __c);
>   if (__p)
>     __ret = __p - __data;
> }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    typename basic_string<_CharT, _Traits, _Alloc>::size_type
>    basic_string<_CharT, _Traits, _Alloc>::
>    rfind(const _CharT* __s, size_type __pos, size_type __n) const
>    noexcept
>    {
>      ;
>      const size_type __size = this->size();
>      if (__n <= __size)
> {
>   __pos = std::min(size_type(__size - __n), __pos);
>   const _CharT* __data = _M_data();
>   do
>     {
>       if (traits_type::compare(__data + __pos, __s, __n) == 0)
>  return __pos;
>     }
>   while (__pos-- > 0);
> }
>      return npos;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    typename basic_string<_CharT, _Traits, _Alloc>::size_type
>    basic_string<_CharT, _Traits, _Alloc>::
>    rfind(_CharT __c, size_type __pos) const noexcept
>    {
>      size_type __size = this->size();
>      if (__size)
> {
>   if (--__size > __pos)
>     __size = __pos;
>   for (++__size; __size-- > 0; )
>     if (traits_type::eq(_M_data()[__size], __c))
>       return __size;
> }
>      return npos;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    typename basic_string<_CharT, _Traits, _Alloc>::size_type
>    basic_string<_CharT, _Traits, _Alloc>::
>    find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
>    noexcept
>    {
>      ;
>      for (; __n && __pos < this->size(); ++__pos)
> {
>   const _CharT* __p = traits_type::find(__s, __n, _M_data()[__pos]);
>   if (__p)
>     return __pos;
> }
>      return npos;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    typename basic_string<_CharT, _Traits, _Alloc>::size_type
>    basic_string<_CharT, _Traits, _Alloc>::
>    find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
>    noexcept
>    {
>      ;
>      size_type __size = this->size();
>      if (__size && __n)
> {
>   if (--__size > __pos)
>     __size = __pos;
>   do
>     {
>       if (traits_type::find(__s, __n, _M_data()[__size]))
>  return __size;
>     }
>   while (__size-- != 0);
> }
>      return npos;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    typename basic_string<_CharT, _Traits, _Alloc>::size_type
>    basic_string<_CharT, _Traits, _Alloc>::
>    find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
>    noexcept
>    {
>      ;
>      for (; __pos < this->size(); ++__pos)
> if (!traits_type::find(__s, __n, _M_data()[__pos]))
>   return __pos;
>      return npos;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    typename basic_string<_CharT, _Traits, _Alloc>::size_type
>    basic_string<_CharT, _Traits, _Alloc>::
>    find_first_not_of(_CharT __c, size_type __pos) const noexcept
>    {
>      for (; __pos < this->size(); ++__pos)
> if (!traits_type::eq(_M_data()[__pos], __c))
>   return __pos;
>      return npos;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    typename basic_string<_CharT, _Traits, _Alloc>::size_type
>    basic_string<_CharT, _Traits, _Alloc>::
>    find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
>    noexcept
>    {
>      ;
>      size_type __size = this->size();
>      if (__size)
> {
>   if (--__size > __pos)
>     __size = __pos;
>   do
>     {
>       if (!traits_type::find(__s, __n, _M_data()[__size]))
>  return __size;
>     }
>   while (__size--);
> }
>      return npos;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    typename basic_string<_CharT, _Traits, _Alloc>::size_type
>    basic_string<_CharT, _Traits, _Alloc>::
>    find_last_not_of(_CharT __c, size_type __pos) const noexcept
>    {
>      size_type __size = this->size();
>      if (__size)
> {
>   if (--__size > __pos)
>     __size = __pos;
>   do
>     {
>       if (!traits_type::eq(_M_data()[__size], __c))
>  return __size;
>     }
>   while (__size--);
> }
>      return npos;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    int
>    basic_string<_CharT, _Traits, _Alloc>::
>    compare(size_type __pos, size_type __n, const basic_string& __str) const
>    {
>      _M_check(__pos, "basic_string::compare");
>      __n = _M_limit(__pos, __n);
>      const size_type __osize = __str.size();
>      const size_type __len = std::min(__n, __osize);
>      int __r = traits_type::compare(_M_data() + __pos, __str.data(), __len);
>      if (!__r)
> __r = _S_compare(__n, __osize);
>      return __r;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    int
>    basic_string<_CharT, _Traits, _Alloc>::
>    compare(size_type __pos1, size_type __n1, const basic_string& __str,
>     size_type __pos2, size_type __n2) const
>    {
>      _M_check(__pos1, "basic_string::compare");
>      __str._M_check(__pos2, "basic_string::compare");
>      __n1 = _M_limit(__pos1, __n1);
>      __n2 = __str._M_limit(__pos2, __n2);
>      const size_type __len = std::min(__n1, __n2);
>      int __r = traits_type::compare(_M_data() + __pos1,
>         __str.data() + __pos2, __len);
>      if (!__r)
> __r = _S_compare(__n1, __n2);
>      return __r;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    int
>    basic_string<_CharT, _Traits, _Alloc>::
>    compare(const _CharT* __s) const noexcept
>    {
>      ;
>      const size_type __size = this->size();
>      const size_type __osize = traits_type::length(__s);
>      const size_type __len = std::min(__size, __osize);
>      int __r = traits_type::compare(_M_data(), __s, __len);
>      if (!__r)
> __r = _S_compare(__size, __osize);
>      return __r;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    int
>    basic_string <_CharT, _Traits, _Alloc>::
>    compare(size_type __pos, size_type __n1, const _CharT* __s) const
>    {
>      ;
>      _M_check(__pos, "basic_string::compare");
>      __n1 = _M_limit(__pos, __n1);
>      const size_type __osize = traits_type::length(__s);
>      const size_type __len = std::min(__n1, __osize);
>      int __r = traits_type::compare(_M_data() + __pos, __s, __len);
>      if (!__r)
> __r = _S_compare(__n1, __osize);
>      return __r;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    int
>    basic_string <_CharT, _Traits, _Alloc>::
>    compare(size_type __pos, size_type __n1, const _CharT* __s,
>     size_type __n2) const
>    {
>      ;
>      _M_check(__pos, "basic_string::compare");
>      __n1 = _M_limit(__pos, __n1);
>      const size_type __len = std::min(__n1, __n2);
>      int __r = traits_type::compare(_M_data() + __pos, __s, __len);
>      if (!__r)
> __r = _S_compare(__n1, __n2);
>      return __r;
>    }
>
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    basic_istream<_CharT, _Traits>&
>    operator>>(basic_istream<_CharT, _Traits>& __in,
>        basic_string<_CharT, _Traits, _Alloc>& __str)
>    {
>      typedef basic_istream<_CharT, _Traits> __istream_type;
>      typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
>      typedef typename __istream_type::ios_base __ios_base;
>      typedef typename __istream_type::int_type __int_type;
>      typedef typename __string_type::size_type __size_type;
>      typedef ctype<_CharT> __ctype_type;
>      typedef typename __ctype_type::ctype_base __ctype_base;
>
>      __size_type __extracted = 0;
>      typename __ios_base::iostate __err = __ios_base::goodbit;
>      typename __istream_type::sentry __cerb(__in, false);
>      if (__cerb)
> {
>   try
>     {
>
>       __str.erase();
>       _CharT __buf[128];
>       __size_type __len = 0;
>       const streamsize __w = __in.width();
>       const __size_type __n = __w > 0 ? static_cast<__size_type>(__w)
>                                : __str.max_size();
>       const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
>       const __int_type __eof = _Traits::eof();
>       __int_type __c = __in.rdbuf()->sgetc();
>
>       while (__extracted < __n
>       && !_Traits::eq_int_type(__c, __eof)
>       && !__ct.is(__ctype_base::space,
>     _Traits::to_char_type(__c)))
>  {
>    if (__len == sizeof(__buf) / sizeof(_CharT))
>      {
>        __str.append(__buf, sizeof(__buf) / sizeof(_CharT));
>        __len = 0;
>      }
>    __buf[__len++] = _Traits::to_char_type(__c);
>    ++__extracted;
>    __c = __in.rdbuf()->snextc();
>  }
>       __str.append(__buf, __len);
>
>       if (_Traits::eq_int_type(__c, __eof))
>  __err |= __ios_base::eofbit;
>       __in.width(0);
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       __in._M_setstate(__ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     {
>
>
>
>       __in._M_setstate(__ios_base::badbit);
>     }
> }
>
>      if (!__extracted)
> __err |= __ios_base::failbit;
>      if (__err)
> __in.setstate(__err);
>      return __in;
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    basic_istream<_CharT, _Traits>&
>    getline(basic_istream<_CharT, _Traits>& __in,
>     basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim)
>    {
>      typedef basic_istream<_CharT, _Traits> __istream_type;
>      typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
>      typedef typename __istream_type::ios_base __ios_base;
>      typedef typename __istream_type::int_type __int_type;
>      typedef typename __string_type::size_type __size_type;
>
>      __size_type __extracted = 0;
>      const __size_type __n = __str.max_size();
>      typename __ios_base::iostate __err = __ios_base::goodbit;
>      typename __istream_type::sentry __cerb(__in, true);
>      if (__cerb)
> {
>   try
>     {
>       __str.erase();
>       const __int_type __idelim = _Traits::to_int_type(__delim);
>       const __int_type __eof = _Traits::eof();
>       __int_type __c = __in.rdbuf()->sgetc();
>
>       while (__extracted < __n
>       && !_Traits::eq_int_type(__c, __eof)
>       && !_Traits::eq_int_type(__c, __idelim))
>  {
>    __str += _Traits::to_char_type(__c);
>    ++__extracted;
>    __c = __in.rdbuf()->snextc();
>  }
>
>       if (_Traits::eq_int_type(__c, __eof))
>  __err |= __ios_base::eofbit;
>       else if (_Traits::eq_int_type(__c, __idelim))
>  {
>    ++__extracted;
>    __in.rdbuf()->sbumpc();
>  }
>       else
>  __err |= __ios_base::failbit;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       __in._M_setstate(__ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     {
>
>
>
>       __in._M_setstate(__ios_base::badbit);
>     }
> }
>      if (!__extracted)
> __err |= __ios_base::failbit;
>      if (__err)
> __in.setstate(__err);
>      return __in;
>    }
>
>
>
>
>  extern template class basic_string<char>;
>  extern template
>    basic_istream<char>&
>    operator>>(basic_istream<char>&, string&);
>  extern template
>    basic_ostream<char>&
>    operator<<(basic_ostream<char>&, const string&);
>  extern template
>    basic_istream<char>&
>    getline(basic_istream<char>&, string&, char);
>  extern template
>    basic_istream<char>&
>    getline(basic_istream<char>&, string&);
>
>
>  extern template class basic_string<wchar_t>;
>  extern template
>    basic_istream<wchar_t>&
>    operator>>(basic_istream<wchar_t>&, wstring&);
>  extern template
>    basic_ostream<wchar_t>&
>    operator<<(basic_ostream<wchar_t>&, const wstring&);
>  extern template
>    basic_istream<wchar_t>&
>    getline(basic_istream<wchar_t>&, wstring&, wchar_t);
>  extern template
>    basic_istream<wchar_t>&
>    getline(basic_istream<wchar_t>&, wstring&);
>
>
>
>
>}
># 54 "/usr/include/c++/8/string" 2 3
># 41 "/usr/include/c++/8/bits/locale_classes.h" 2 3
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 62 "/usr/include/c++/8/bits/locale_classes.h" 3
>  class locale
>  {
>  public:
>
>
>    typedef int category;
>
>
>    class facet;
>    class id;
>    class _Impl;
>
>    friend class facet;
>    friend class _Impl;
>
>    template<typename _Facet>
>      friend bool
>      has_facet(const locale&) throw();
>
>    template<typename _Facet>
>      friend const _Facet&
>      use_facet(const locale&);
>
>    template<typename _Cache>
>      friend struct __use_cache;
># 98 "/usr/include/c++/8/bits/locale_classes.h" 3
>    static const category none = 0;
>    static const category ctype = 1L << 0;
>    static const category numeric = 1L << 1;
>    static const category collate = 1L << 2;
>    static const category time = 1L << 3;
>    static const category monetary = 1L << 4;
>    static const category messages = 1L << 5;
>    static const category all = (ctype | numeric | collate |
>        time | monetary | messages);
># 117 "/usr/include/c++/8/bits/locale_classes.h" 3
>    locale() throw();
># 126 "/usr/include/c++/8/bits/locale_classes.h" 3
>    locale(const locale& __other) throw();
># 136 "/usr/include/c++/8/bits/locale_classes.h" 3
>    explicit
>    locale(const char* __s);
># 151 "/usr/include/c++/8/bits/locale_classes.h" 3
>    locale(const locale& __base, const char* __s, category __cat);
># 162 "/usr/include/c++/8/bits/locale_classes.h" 3
>    explicit
>    locale(const std::string& __s) : locale(__s.c_str()) { }
># 177 "/usr/include/c++/8/bits/locale_classes.h" 3
>    locale(const locale& __base, const std::string& __s, category __cat)
>    : locale(__base, __s.c_str(), __cat) { }
># 192 "/usr/include/c++/8/bits/locale_classes.h" 3
>    locale(const locale& __base, const locale& __add, category __cat);
># 205 "/usr/include/c++/8/bits/locale_classes.h" 3
>    template<typename _Facet>
>      locale(const locale& __other, _Facet* __f);
>
>
>    ~locale() throw();
># 219 "/usr/include/c++/8/bits/locale_classes.h" 3
>    const locale&
>    operator=(const locale& __other) throw();
># 234 "/usr/include/c++/8/bits/locale_classes.h" 3
>    template<typename _Facet>
>      locale
>      combine(const locale& __other) const;
>
>
>
>
>
>
>    __attribute ((__abi_tag__ ("cxx11")))
>    string
>    name() const;
># 254 "/usr/include/c++/8/bits/locale_classes.h" 3
>    bool
>    operator==(const locale& __other) const throw();
>
>
>
>
>
>
>
>    bool
>    operator!=(const locale& __other) const throw()
>    { return !(this->operator==(__other)); }
># 282 "/usr/include/c++/8/bits/locale_classes.h" 3
>    template<typename _Char, typename _Traits, typename _Alloc>
>      bool
>      operator()(const basic_string<_Char, _Traits, _Alloc>& __s1,
>   const basic_string<_Char, _Traits, _Alloc>& __s2) const;
># 298 "/usr/include/c++/8/bits/locale_classes.h" 3
>    static locale
>    global(const locale& __loc);
>
>
>
>
>    static const locale&
>    classic();
>
>  private:
>
>    _Impl* _M_impl;
>
>
>    static _Impl* _S_classic;
>
>
>    static _Impl* _S_global;
>
>
>
>
>
>    static const char* const* const _S_categories;
># 333 "/usr/include/c++/8/bits/locale_classes.h" 3
>    enum { _S_categories_size = 6 + 6 };
>
>
>    static __gthread_once_t _S_once;
>
>
>    explicit
>    locale(_Impl*) throw();
>
>    static void
>    _S_initialize();
>
>    static void
>    _S_initialize_once() throw();
>
>    static category
>    _S_normalize_category(category);
>
>    void
>    _M_coalesce(const locale& __base, const locale& __add, category __cat);
>
>
>    static const id* const _S_twinned_facets[];
>
>  };
># 371 "/usr/include/c++/8/bits/locale_classes.h" 3
>  class locale::facet
>  {
>  private:
>    friend class locale;
>    friend class locale::_Impl;
>
>    mutable _Atomic_word _M_refcount;
>
>
>    static __c_locale _S_c_locale;
>
>
>    static const char _S_c_name[2];
>
>
>    static __gthread_once_t _S_once;
>
>
>    static void
>    _S_initialize_once();
>
>  protected:
># 402 "/usr/include/c++/8/bits/locale_classes.h" 3
>    explicit
>    facet(size_t __refs = 0) throw() : _M_refcount(__refs ? 1 : 0)
>    { }
>
>
>    virtual
>    ~facet();
>
>    static void
>    _S_create_c_locale(__c_locale& __cloc, const char* __s,
>         __c_locale __old = 0);
>
>    static __c_locale
>    _S_clone_c_locale(__c_locale& __cloc) throw();
>
>    static void
>    _S_destroy_c_locale(__c_locale& __cloc);
>
>    static __c_locale
>    _S_lc_ctype_c_locale(__c_locale __cloc, const char* __s);
>
>
>
>    static __c_locale
>    _S_get_c_locale();
>
>    __attribute__ ((__const__)) static const char*
>    _S_get_c_name() throw();
># 438 "/usr/include/c++/8/bits/locale_classes.h" 3
>    facet(const facet&) = delete;
>
>    facet&
>    operator=(const facet&) = delete;
>
>
>  private:
>    void
>    _M_add_reference() const throw()
>    { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); }
>
>    void
>    _M_remove_reference() const throw()
>    {
>
>      ;
>      if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1)
> {
>          ;
>   try
>     { delete this; }
>   catch(...)
>     { }
> }
>    }
>
>    const facet* _M_sso_shim(const id*) const;
>    const facet* _M_cow_shim(const id*) const;
>
>  protected:
>    class __shim;
>  };
># 483 "/usr/include/c++/8/bits/locale_classes.h" 3
>  class locale::id
>  {
>  private:
>    friend class locale;
>    friend class locale::_Impl;
>
>    template<typename _Facet>
>      friend const _Facet&
>      use_facet(const locale&);
>
>    template<typename _Facet>
>      friend bool
>      has_facet(const locale&) throw();
>
>
>
>
>    mutable size_t _M_index;
>
>
>    static _Atomic_word _S_refcount;
>
>    void
>    operator=(const id&);
>
>    id(const id&);
>
>  public:
>
>
>
>    id() { }
>
>    size_t
>    _M_id() const throw();
>  };
>
>
>
>  class locale::_Impl
>  {
>  public:
>
>    friend class locale;
>    friend class locale::facet;
>
>    template<typename _Facet>
>      friend bool
>      has_facet(const locale&) throw();
>
>    template<typename _Facet>
>      friend const _Facet&
>      use_facet(const locale&);
>
>    template<typename _Cache>
>      friend struct __use_cache;
>
>  private:
>
>    _Atomic_word _M_refcount;
>    const facet** _M_facets;
>    size_t _M_facets_size;
>    const facet** _M_caches;
>    char** _M_names;
>    static const locale::id* const _S_id_ctype[];
>    static const locale::id* const _S_id_numeric[];
>    static const locale::id* const _S_id_collate[];
>    static const locale::id* const _S_id_time[];
>    static const locale::id* const _S_id_monetary[];
>    static const locale::id* const _S_id_messages[];
>    static const locale::id* const* const _S_facet_categories[];
>
>    void
>    _M_add_reference() throw()
>    { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); }
>
>    void
>    _M_remove_reference() throw()
>    {
>
>      ;
>      if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1)
> {
>          ;
>   try
>     { delete this; }
>   catch(...)
>     { }
> }
>    }
>
>    _Impl(const _Impl&, size_t);
>    _Impl(const char*, size_t);
>    _Impl(size_t) throw();
>
>   ~_Impl() throw();
>
>    _Impl(const _Impl&);
>
>    void
>    operator=(const _Impl&);
>
>    bool
>    _M_check_same_name()
>    {
>      bool __ret = true;
>      if (_M_names[1])
>
> for (size_t __i = 0; __ret && __i < _S_categories_size - 1; ++__i)
>   __ret = __builtin_strcmp(_M_names[__i], _M_names[__i + 1]) == 0;
>      return __ret;
>    }
>
>    void
>    _M_replace_categories(const _Impl*, category);
>
>    void
>    _M_replace_category(const _Impl*, const locale::id* const*);
>
>    void
>    _M_replace_facet(const _Impl*, const locale::id*);
>
>    void
>    _M_install_facet(const locale::id*, const facet*);
>
>    template<typename _Facet>
>      void
>      _M_init_facet(_Facet* __facet)
>      { _M_install_facet(&_Facet::id, __facet); }
>
>    template<typename _Facet>
>      void
>      _M_init_facet_unchecked(_Facet* __facet)
>      {
> __facet->_M_add_reference();
> _M_facets[_Facet::id._M_id()] = __facet;
>      }
>
>    void
>    _M_install_cache(const facet*, size_t);
>
>    void _M_init_extra(facet**);
>    void _M_init_extra(void*, void*, const char*, const char*);
>  };
># 641 "/usr/include/c++/8/bits/locale_classes.h" 3
>  template<typename _CharT>
>    class __cxx11:: collate : public locale::facet
>    {
>    public:
>
>
>
>      typedef _CharT char_type;
>      typedef basic_string<_CharT> string_type;
>
>
>    protected:
>
>
>      __c_locale _M_c_locale_collate;
>
>    public:
>
>      static locale::id id;
># 668 "/usr/include/c++/8/bits/locale_classes.h" 3
>      explicit
>      collate(size_t __refs = 0)
>      : facet(__refs), _M_c_locale_collate(_S_get_c_locale())
>      { }
># 682 "/usr/include/c++/8/bits/locale_classes.h" 3
>      explicit
>      collate(__c_locale __cloc, size_t __refs = 0)
>      : facet(__refs), _M_c_locale_collate(_S_clone_c_locale(__cloc))
>      { }
># 699 "/usr/include/c++/8/bits/locale_classes.h" 3
>      int
>      compare(const _CharT* __lo1, const _CharT* __hi1,
>       const _CharT* __lo2, const _CharT* __hi2) const
>      { return this->do_compare(__lo1, __hi1, __lo2, __hi2); }
># 718 "/usr/include/c++/8/bits/locale_classes.h" 3
>      string_type
>      transform(const _CharT* __lo, const _CharT* __hi) const
>      { return this->do_transform(__lo, __hi); }
># 732 "/usr/include/c++/8/bits/locale_classes.h" 3
>      long
>      hash(const _CharT* __lo, const _CharT* __hi) const
>      { return this->do_hash(__lo, __hi); }
>
>
>      int
>      _M_compare(const _CharT*, const _CharT*) const throw();
>
>      size_t
>      _M_transform(_CharT*, const _CharT*, size_t) const throw();
>
>  protected:
>
>      virtual
>      ~collate()
>      { _S_destroy_c_locale(_M_c_locale_collate); }
># 761 "/usr/include/c++/8/bits/locale_classes.h" 3
>      virtual int
>      do_compare(const _CharT* __lo1, const _CharT* __hi1,
>   const _CharT* __lo2, const _CharT* __hi2) const;
># 775 "/usr/include/c++/8/bits/locale_classes.h" 3
>      virtual string_type
>      do_transform(const _CharT* __lo, const _CharT* __hi) const;
># 788 "/usr/include/c++/8/bits/locale_classes.h" 3
>      virtual long
>      do_hash(const _CharT* __lo, const _CharT* __hi) const;
>    };
>
>  template<typename _CharT>
>    locale::id collate<_CharT>::id;
>
>
>  template<>
>    int
>    collate<char>::_M_compare(const char*, const char*) const throw();
>
>  template<>
>    size_t
>    collate<char>::_M_transform(char*, const char*, size_t) const throw();
>
>
>  template<>
>    int
>    collate<wchar_t>::_M_compare(const wchar_t*, const wchar_t*) const throw();
>
>  template<>
>    size_t
>    collate<wchar_t>::_M_transform(wchar_t*, const wchar_t*, size_t) const throw();
>
>
>
>  template<typename _CharT>
>    class __cxx11:: collate_byname : public collate<_CharT>
>    {
>    public:
>
>
>      typedef _CharT char_type;
>      typedef basic_string<_CharT> string_type;
>
>
>      explicit
>      collate_byname(const char* __s, size_t __refs = 0)
>      : collate<_CharT>(__refs)
>      {
> if (__builtin_strcmp(__s, "C") != 0
>     && __builtin_strcmp(__s, "POSIX") != 0)
>   {
>     this->_S_destroy_c_locale(this->_M_c_locale_collate);
>     this->_S_create_c_locale(this->_M_c_locale_collate, __s);
>   }
>      }
>
>
>      explicit
>      collate_byname(const string& __s, size_t __refs = 0)
>      : collate_byname(__s.c_str(), __refs) { }
>
>
>    protected:
>      virtual
>      ~collate_byname() { }
>    };
>
>
>}
>
># 1 "/usr/include/c++/8/bits/locale_classes.tcc" 1 3
># 37 "/usr/include/c++/8/bits/locale_classes.tcc" 3
>       
># 38 "/usr/include/c++/8/bits/locale_classes.tcc" 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  template<typename _Facet>
>    locale::
>    locale(const locale& __other, _Facet* __f)
>    {
>      _M_impl = new _Impl(*__other._M_impl, 1);
>
>      try
> { _M_impl->_M_install_facet(&_Facet::id, __f); }
>      catch(...)
> {
>   _M_impl->_M_remove_reference();
>   throw;
> }
>      delete [] _M_impl->_M_names[0];
>      _M_impl->_M_names[0] = 0;
>    }
>
>  template<typename _Facet>
>    locale
>    locale::
>    combine(const locale& __other) const
>    {
>      _Impl* __tmp = new _Impl(*_M_impl, 1);
>      try
> {
>   __tmp->_M_replace_facet(__other._M_impl, &_Facet::id);
> }
>      catch(...)
> {
>   __tmp->_M_remove_reference();
>   throw;
> }
>      return locale(__tmp);
>    }
>
>  template<typename _CharT, typename _Traits, typename _Alloc>
>    bool
>    locale::
>    operator()(const basic_string<_CharT, _Traits, _Alloc>& __s1,
>        const basic_string<_CharT, _Traits, _Alloc>& __s2) const
>    {
>      typedef std::collate<_CharT> __collate_type;
>      const __collate_type& __collate = use_facet<__collate_type>(*this);
>      return (__collate.compare(__s1.data(), __s1.data() + __s1.length(),
>    __s2.data(), __s2.data() + __s2.length()) < 0);
>    }
># 102 "/usr/include/c++/8/bits/locale_classes.tcc" 3
>  template<typename _Facet>
>    bool
>    has_facet(const locale& __loc) throw()
>    {
>      const size_t __i = _Facet::id._M_id();
>      const locale::facet** __facets = __loc._M_impl->_M_facets;
>      return (__i < __loc._M_impl->_M_facets_size
>
>       && dynamic_cast<const _Facet*>(__facets[__i]));
>
>
>
>    }
># 130 "/usr/include/c++/8/bits/locale_classes.tcc" 3
>  template<typename _Facet>
>    const _Facet&
>    use_facet(const locale& __loc)
>    {
>      const size_t __i = _Facet::id._M_id();
>      const locale::facet** __facets = __loc._M_impl->_M_facets;
>      if (__i >= __loc._M_impl->_M_facets_size || !__facets[__i])
>        __throw_bad_cast();
>
>      return dynamic_cast<const _Facet&>(*__facets[__i]);
>
>
>
>    }
>
>
>
>  template<typename _CharT>
>    int
>    collate<_CharT>::_M_compare(const _CharT*, const _CharT*) const throw ()
>    { return 0; }
>
>
>  template<typename _CharT>
>    size_t
>    collate<_CharT>::_M_transform(_CharT*, const _CharT*, size_t) const throw ()
>    { return 0; }
>
>  template<typename _CharT>
>    int
>    collate<_CharT>::
>    do_compare(const _CharT* __lo1, const _CharT* __hi1,
>        const _CharT* __lo2, const _CharT* __hi2) const
>    {
>
>
>      const string_type __one(__lo1, __hi1);
>      const string_type __two(__lo2, __hi2);
>
>      const _CharT* __p = __one.c_str();
>      const _CharT* __pend = __one.data() + __one.length();
>      const _CharT* __q = __two.c_str();
>      const _CharT* __qend = __two.data() + __two.length();
>
>
>
>
>      for (;;)
> {
>   const int __res = _M_compare(__p, __q);
>   if (__res)
>     return __res;
>
>   __p += char_traits<_CharT>::length(__p);
>   __q += char_traits<_CharT>::length(__q);
>   if (__p == __pend && __q == __qend)
>     return 0;
>   else if (__p == __pend)
>     return -1;
>   else if (__q == __qend)
>     return 1;
>
>   __p++;
>   __q++;
> }
>    }
>
>  template<typename _CharT>
>    typename collate<_CharT>::string_type
>    collate<_CharT>::
>    do_transform(const _CharT* __lo, const _CharT* __hi) const
>    {
>      string_type __ret;
>
>
>      const string_type __str(__lo, __hi);
>
>      const _CharT* __p = __str.c_str();
>      const _CharT* __pend = __str.data() + __str.length();
>
>      size_t __len = (__hi - __lo) * 2;
>
>      _CharT* __c = new _CharT[__len];
>
>      try
> {
>
>
>
>   for (;;)
>     {
>
>       size_t __res = _M_transform(__c, __p, __len);
>
>
>       if (__res >= __len)
>  {
>    __len = __res + 1;
>    delete [] __c, __c = 0;
>    __c = new _CharT[__len];
>    __res = _M_transform(__c, __p, __len);
>  }
>
>       __ret.append(__c, __res);
>       __p += char_traits<_CharT>::length(__p);
>       if (__p == __pend)
>  break;
>
>       __p++;
>       __ret.push_back(_CharT());
>     }
> }
>      catch(...)
> {
>   delete [] __c;
>   throw;
> }
>
>      delete [] __c;
>
>      return __ret;
>    }
>
>  template<typename _CharT>
>    long
>    collate<_CharT>::
>    do_hash(const _CharT* __lo, const _CharT* __hi) const
>    {
>      unsigned long __val = 0;
>      for (; __lo < __hi; ++__lo)
> __val =
>   *__lo + ((__val << 7)
>     | (__val >> (__gnu_cxx::__numeric_traits<unsigned long>::
>    __digits - 7)));
>      return static_cast<long>(__val);
>    }
>
>
>
>
>  extern template class collate<char>;
>  extern template class collate_byname<char>;
>
>  extern template
>    const collate<char>&
>    use_facet<collate<char> >(const locale&);
>
>  extern template
>    bool
>    has_facet<collate<char> >(const locale&);
>
>
>  extern template class collate<wchar_t>;
>  extern template class collate_byname<wchar_t>;
>
>  extern template
>    const collate<wchar_t>&
>    use_facet<collate<wchar_t> >(const locale&);
>
>  extern template
>    bool
>    has_facet<collate<wchar_t> >(const locale&);
>
>
>
>
>}
># 852 "/usr/include/c++/8/bits/locale_classes.h" 2 3
># 42 "/usr/include/c++/8/bits/ios_base.h" 2 3
>
>
>
>
># 1 "/usr/include/c++/8/system_error" 1 3
># 32 "/usr/include/c++/8/system_error" 3
>       
># 33 "/usr/include/c++/8/system_error" 3
>
>
>
>
>
>
># 1 "/usr/include/c++/8/x86_64-redhat-linux/bits/error_constants.h" 1 3
># 34 "/usr/include/c++/8/x86_64-redhat-linux/bits/error_constants.h" 3
># 1 "/usr/include/c++/8/cerrno" 1 3
># 39 "/usr/include/c++/8/cerrno" 3
>       
># 40 "/usr/include/c++/8/cerrno" 3
># 35 "/usr/include/c++/8/x86_64-redhat-linux/bits/error_constants.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  enum class errc
>    {
>      address_family_not_supported = 97,
>      address_in_use = 98,
>      address_not_available = 99,
>      already_connected = 106,
>      argument_list_too_long = 7,
>      argument_out_of_domain = 33,
>      bad_address = 14,
>      bad_file_descriptor = 9,
>
>
>      bad_message = 74,
>
>
>      broken_pipe = 32,
>      connection_aborted = 103,
>      connection_already_in_progress = 114,
>      connection_refused = 111,
>      connection_reset = 104,
>      cross_device_link = 18,
>      destination_address_required = 89,
>      device_or_resource_busy = 16,
>      directory_not_empty = 39,
>      executable_format_error = 8,
>      file_exists = 17,
>      file_too_large = 27,
>      filename_too_long = 36,
>      function_not_supported = 38,
>      host_unreachable = 113,
>
>
>      identifier_removed = 43,
>
>
>      illegal_byte_sequence = 84,
>      inappropriate_io_control_operation = 25,
>      interrupted = 4,
>      invalid_argument = 22,
>      invalid_seek = 29,
>      io_error = 5,
>      is_a_directory = 21,
>      message_size = 90,
>      network_down = 100,
>      network_reset = 102,
>      network_unreachable = 101,
>      no_buffer_space = 105,
>      no_child_process = 10,
>
>
>      no_link = 67,
>
>
>      no_lock_available = 37,
>
>
>      no_message_available = 61,
>
>
>      no_message = 42,
>      no_protocol_option = 92,
>      no_space_on_device = 28,
>
>
>      no_stream_resources = 63,
>
>
>      no_such_device_or_address = 6,
>      no_such_device = 19,
>      no_such_file_or_directory = 2,
>      no_such_process = 3,
>      not_a_directory = 20,
>      not_a_socket = 88,
>
>
>      not_a_stream = 60,
>
>
>      not_connected = 107,
>      not_enough_memory = 12,
>
>
>      not_supported = 95,
>
>
>
>      operation_canceled = 125,
>
>
>      operation_in_progress = 115,
>      operation_not_permitted = 1,
>      operation_not_supported = 95,
>      operation_would_block = 11,
>
>
>      owner_dead = 130,
>
>
>      permission_denied = 13,
>
>
>      protocol_error = 71,
>
>
>      protocol_not_supported = 93,
>      read_only_file_system = 30,
>      resource_deadlock_would_occur = 35,
>      resource_unavailable_try_again = 11,
>      result_out_of_range = 34,
>
>
>      state_not_recoverable = 131,
>
>
>
>      stream_timeout = 62,
>
>
>
>      text_file_busy = 26,
>
>
>      timed_out = 110,
>      too_many_files_open_in_system = 23,
>      too_many_files_open = 24,
>      too_many_links = 31,
>      too_many_symbolic_link_levels = 40,
>
>
>      value_too_large = 75,
>
>
>      wrong_protocol_type = 91
>    };
>
>
>}
># 40 "/usr/include/c++/8/system_error" 2 3
>
># 1 "/usr/include/c++/8/stdexcept" 1 3
># 36 "/usr/include/c++/8/stdexcept" 3
>       
># 37 "/usr/include/c++/8/stdexcept" 3
>
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>
>  struct __cow_string
>  {
>    union {
>      const char* _M_p;
>      char _M_bytes[sizeof(const char*)];
>    };
>
>    __cow_string();
>    __cow_string(const std::string&);
>    __cow_string(const char*, size_t);
>    __cow_string(const __cow_string&) noexcept;
>    __cow_string& operator=(const __cow_string&) noexcept;
>    ~__cow_string();
>
>    __cow_string(__cow_string&&) noexcept;
>    __cow_string& operator=(__cow_string&&) noexcept;
>
>  };
>
>  typedef basic_string<char> __sso_string;
># 113 "/usr/include/c++/8/stdexcept" 3
>  class logic_error : public exception
>  {
>    __cow_string _M_msg;
>
>  public:
>
>    explicit
>    logic_error(const string& __arg) ;
>
>
>    explicit
>    logic_error(const char*) ;
>
>
>
>    logic_error(const logic_error&) noexcept;
>    logic_error& operator=(const logic_error&) noexcept;
>
>
>    virtual ~logic_error() noexcept;
>
>
>
>    virtual const char*
>    what() const noexcept;
>
>
>
>
>
>  };
>
>
>
>  class domain_error : public logic_error
>  {
>  public:
>    explicit domain_error(const string& __arg) ;
>
>    explicit domain_error(const char*) ;
>
>    virtual ~domain_error() noexcept;
>  };
>
>
>  class invalid_argument : public logic_error
>  {
>  public:
>    explicit invalid_argument(const string& __arg) ;
>
>    explicit invalid_argument(const char*) ;
>
>    virtual ~invalid_argument() noexcept;
>  };
>
>
>
>  class length_error : public logic_error
>  {
>  public:
>    explicit length_error(const string& __arg) ;
>
>    explicit length_error(const char*) ;
>
>    virtual ~length_error() noexcept;
>  };
>
>
>
>  class out_of_range : public logic_error
>  {
>  public:
>    explicit out_of_range(const string& __arg) ;
>
>    explicit out_of_range(const char*) ;
>
>    virtual ~out_of_range() noexcept;
>  };
>
>
>
>
>
>
>  class runtime_error : public exception
>  {
>    __cow_string _M_msg;
>
>  public:
>
>    explicit
>    runtime_error(const string& __arg) ;
>
>
>    explicit
>    runtime_error(const char*) ;
>
>
>
>    runtime_error(const runtime_error&) noexcept;
>    runtime_error& operator=(const runtime_error&) noexcept;
>
>
>    virtual ~runtime_error() noexcept;
>
>
>
>    virtual const char*
>    what() const noexcept;
>
>
>
>
>
>  };
>
>
>  class range_error : public runtime_error
>  {
>  public:
>    explicit range_error(const string& __arg) ;
>
>    explicit range_error(const char*) ;
>
>    virtual ~range_error() noexcept;
>  };
>
>
>  class overflow_error : public runtime_error
>  {
>  public:
>    explicit overflow_error(const string& __arg) ;
>
>    explicit overflow_error(const char*) ;
>
>    virtual ~overflow_error() noexcept;
>  };
>
>
>  class underflow_error : public runtime_error
>  {
>  public:
>    explicit underflow_error(const string& __arg) ;
>
>    explicit underflow_error(const char*) ;
>
>    virtual ~underflow_error() noexcept;
>  };
>
>
>
>
>}
># 42 "/usr/include/c++/8/system_error" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  class error_code;
>  class error_condition;
>  class system_error;
>
>
>  template<typename _Tp>
>    struct is_error_code_enum : public false_type { };
>
>
>  template<typename _Tp>
>    struct is_error_condition_enum : public false_type { };
>
>  template<>
>    struct is_error_condition_enum<errc>
>    : public true_type { };
># 71 "/usr/include/c++/8/system_error" 3
>  inline namespace _V2 {
>
>
>  class error_category
>  {
>  public:
>    constexpr error_category() noexcept = default;
>
>    virtual ~error_category();
>
>    error_category(const error_category&) = delete;
>    error_category& operator=(const error_category&) = delete;
>
>    virtual const char*
>    name() const noexcept = 0;
>
>
>
>
>
>
>  private:
>    __attribute ((__abi_tag__ ("cxx11")))
>    virtual __cow_string
>    _M_message(int) const;
>
>  public:
>    __attribute ((__abi_tag__ ("cxx11")))
>    virtual string
>    message(int) const = 0;
># 110 "/usr/include/c++/8/system_error" 3
>  public:
>    virtual error_condition
>    default_error_condition(int __i) const noexcept;
>
>    virtual bool
>    equivalent(int __i, const error_condition& __cond) const noexcept;
>
>    virtual bool
>    equivalent(const error_code& __code, int __i) const noexcept;
>
>    bool
>    operator<(const error_category& __other) const noexcept
>    { return less<const error_category*>()(this, &__other); }
>
>    bool
>    operator==(const error_category& __other) const noexcept
>    { return this == &__other; }
>
>    bool
>    operator!=(const error_category& __other) const noexcept
>    { return this != &__other; }
>  };
>
>
>  __attribute__ ((__const__)) const error_category& system_category() noexcept;
>  __attribute__ ((__const__)) const error_category& generic_category() noexcept;
>
>  }
>
>  error_code make_error_code(errc) noexcept;
>
>  template<typename _Tp>
>    struct hash;
>
>
>
>  struct error_code
>  {
>    error_code() noexcept
>    : _M_value(0), _M_cat(&system_category()) { }
>
>    error_code(int __v, const error_category& __cat) noexcept
>    : _M_value(__v), _M_cat(&__cat) { }
>
>    template<typename _ErrorCodeEnum, typename = typename
>      enable_if<is_error_code_enum<_ErrorCodeEnum>::value>::type>
>      error_code(_ErrorCodeEnum __e) noexcept
>      { *this = make_error_code(__e); }
>
>    void
>    assign(int __v, const error_category& __cat) noexcept
>    {
>      _M_value = __v;
>      _M_cat = &__cat;
>    }
>
>    void
>    clear() noexcept
>    { assign(0, system_category()); }
>
>
>    template<typename _ErrorCodeEnum>
>      typename enable_if<is_error_code_enum<_ErrorCodeEnum>::value,
>    error_code&>::type
>      operator=(_ErrorCodeEnum __e) noexcept
>      { return *this = make_error_code(__e); }
>
>    int
>    value() const noexcept { return _M_value; }
>
>    const error_category&
>    category() const noexcept { return *_M_cat; }
>
>    error_condition
>    default_error_condition() const noexcept;
>
>    __attribute ((__abi_tag__ ("cxx11")))
>    string
>    message() const
>    { return category().message(value()); }
>
>    explicit operator bool() const noexcept
>    { return _M_value != 0; }
>
>
>  private:
>    friend class hash<error_code>;
>
>    int _M_value;
>    const error_category* _M_cat;
>  };
>
>
>  inline error_code
>  make_error_code(errc __e) noexcept
>  { return error_code(static_cast<int>(__e), generic_category()); }
>
>  inline bool
>  operator<(const error_code& __lhs, const error_code& __rhs) noexcept
>  {
>    return (__lhs.category() < __rhs.category()
>     || (__lhs.category() == __rhs.category()
>  && __lhs.value() < __rhs.value()));
>  }
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits>&
>    operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
>    { return (__os << __e.category().name() << ':' << __e.value()); }
>
>  error_condition make_error_condition(errc) noexcept;
>
>
>
>  struct error_condition
>  {
>    error_condition() noexcept
>    : _M_value(0), _M_cat(&generic_category()) { }
>
>    error_condition(int __v, const error_category& __cat) noexcept
>    : _M_value(__v), _M_cat(&__cat) { }
>
>    template<typename _ErrorConditionEnum, typename = typename
>  enable_if<is_error_condition_enum<_ErrorConditionEnum>::value>::type>
>      error_condition(_ErrorConditionEnum __e) noexcept
>      { *this = make_error_condition(__e); }
>
>    void
>    assign(int __v, const error_category& __cat) noexcept
>    {
>      _M_value = __v;
>      _M_cat = &__cat;
>    }
>
>
>    template<typename _ErrorConditionEnum>
>      typename enable_if<is_error_condition_enum
>    <_ErrorConditionEnum>::value, error_condition&>::type
>      operator=(_ErrorConditionEnum __e) noexcept
>      { return *this = make_error_condition(__e); }
>
>    void
>    clear() noexcept
>    { assign(0, generic_category()); }
>
>
>    int
>    value() const noexcept { return _M_value; }
>
>    const error_category&
>    category() const noexcept { return *_M_cat; }
>
>    __attribute ((__abi_tag__ ("cxx11")))
>    string
>    message() const
>    { return category().message(value()); }
>
>    explicit operator bool() const noexcept
>    { return _M_value != 0; }
>
>
>  private:
>    int _M_value;
>    const error_category* _M_cat;
>  };
>
>
>  inline error_condition
>  make_error_condition(errc __e) noexcept
>  { return error_condition(static_cast<int>(__e), generic_category()); }
>
>  inline bool
>  operator<(const error_condition& __lhs,
>     const error_condition& __rhs) noexcept
>  {
>    return (__lhs.category() < __rhs.category()
>     || (__lhs.category() == __rhs.category()
>  && __lhs.value() < __rhs.value()));
>  }
>
>
>  inline bool
>  operator==(const error_code& __lhs, const error_code& __rhs) noexcept
>  { return (__lhs.category() == __rhs.category()
>     && __lhs.value() == __rhs.value()); }
>
>  inline bool
>  operator==(const error_code& __lhs, const error_condition& __rhs) noexcept
>  {
>    return (__lhs.category().equivalent(__lhs.value(), __rhs)
>     || __rhs.category().equivalent(__lhs, __rhs.value()));
>  }
>
>  inline bool
>  operator==(const error_condition& __lhs, const error_code& __rhs) noexcept
>  {
>    return (__rhs.category().equivalent(__rhs.value(), __lhs)
>     || __lhs.category().equivalent(__rhs, __lhs.value()));
>  }
>
>  inline bool
>  operator==(const error_condition& __lhs,
>      const error_condition& __rhs) noexcept
>  {
>    return (__lhs.category() == __rhs.category()
>     && __lhs.value() == __rhs.value());
>  }
>
>  inline bool
>  operator!=(const error_code& __lhs, const error_code& __rhs) noexcept
>  { return !(__lhs == __rhs); }
>
>  inline bool
>  operator!=(const error_code& __lhs, const error_condition& __rhs) noexcept
>  { return !(__lhs == __rhs); }
>
>  inline bool
>  operator!=(const error_condition& __lhs, const error_code& __rhs) noexcept
>  { return !(__lhs == __rhs); }
>
>  inline bool
>  operator!=(const error_condition& __lhs,
>      const error_condition& __rhs) noexcept
>  { return !(__lhs == __rhs); }
>
>
>
>
>
>
>
>  class system_error : public std::runtime_error
>  {
>  private:
>    error_code _M_code;
>
>  public:
>    system_error(error_code __ec = error_code())
>    : runtime_error(__ec.message()), _M_code(__ec) { }
>
>    system_error(error_code __ec, const string& __what)
>    : runtime_error(__what + ": " + __ec.message()), _M_code(__ec) { }
>
>    system_error(error_code __ec, const char* __what)
>    : runtime_error(__what + (": " + __ec.message())), _M_code(__ec) { }
>
>    system_error(int __v, const error_category& __ecat, const char* __what)
>    : system_error(error_code(__v, __ecat), __what) { }
>
>    system_error(int __v, const error_category& __ecat)
>    : runtime_error(error_code(__v, __ecat).message()),
>      _M_code(__v, __ecat) { }
>
>    system_error(int __v, const error_category& __ecat, const string& __what)
>    : runtime_error(__what + ": " + error_code(__v, __ecat).message()),
>      _M_code(__v, __ecat) { }
>
>    virtual ~system_error() noexcept;
>
>    const error_code&
>    code() const noexcept { return _M_code; }
>  };
>
>
>}
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>
>  template<>
>    struct hash<error_code>
>    : public __hash_base<size_t, error_code>
>    {
>      size_t
>      operator()(const error_code& __e) const noexcept
>      {
> const size_t __tmp = std::_Hash_impl::hash(__e._M_value);
> return std::_Hash_impl::__hash_combine(__e._M_cat, __tmp);
>      }
>    };
># 414 "/usr/include/c++/8/system_error" 3
>
>}
># 47 "/usr/include/c++/8/bits/ios_base.h" 2 3
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>
>
>  enum _Ios_Fmtflags
>    {
>      _S_boolalpha = 1L << 0,
>      _S_dec = 1L << 1,
>      _S_fixed = 1L << 2,
>      _S_hex = 1L << 3,
>      _S_internal = 1L << 4,
>      _S_left = 1L << 5,
>      _S_oct = 1L << 6,
>      _S_right = 1L << 7,
>      _S_scientific = 1L << 8,
>      _S_showbase = 1L << 9,
>      _S_showpoint = 1L << 10,
>      _S_showpos = 1L << 11,
>      _S_skipws = 1L << 12,
>      _S_unitbuf = 1L << 13,
>      _S_uppercase = 1L << 14,
>      _S_adjustfield = _S_left | _S_right | _S_internal,
>      _S_basefield = _S_dec | _S_oct | _S_hex,
>      _S_floatfield = _S_scientific | _S_fixed,
>      _S_ios_fmtflags_end = 1L << 16,
>      _S_ios_fmtflags_max = 0x7fffffff,
>      _S_ios_fmtflags_min = ~0x7fffffff
>    };
>
>  inline constexpr _Ios_Fmtflags
>  operator&(_Ios_Fmtflags __a, _Ios_Fmtflags __b)
>  { return _Ios_Fmtflags(static_cast<int>(__a) & static_cast<int>(__b)); }
>
>  inline constexpr _Ios_Fmtflags
>  operator|(_Ios_Fmtflags __a, _Ios_Fmtflags __b)
>  { return _Ios_Fmtflags(static_cast<int>(__a) | static_cast<int>(__b)); }
>
>  inline constexpr _Ios_Fmtflags
>  operator^(_Ios_Fmtflags __a, _Ios_Fmtflags __b)
>  { return _Ios_Fmtflags(static_cast<int>(__a) ^ static_cast<int>(__b)); }
>
>  inline constexpr _Ios_Fmtflags
>  operator~(_Ios_Fmtflags __a)
>  { return _Ios_Fmtflags(~static_cast<int>(__a)); }
>
>  inline const _Ios_Fmtflags&
>  operator|=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b)
>  { return __a = __a | __b; }
>
>  inline const _Ios_Fmtflags&
>  operator&=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b)
>  { return __a = __a & __b; }
>
>  inline const _Ios_Fmtflags&
>  operator^=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b)
>  { return __a = __a ^ __b; }
>
>
>  enum _Ios_Openmode
>    {
>      _S_app = 1L << 0,
>      _S_ate = 1L << 1,
>      _S_bin = 1L << 2,
>      _S_in = 1L << 3,
>      _S_out = 1L << 4,
>      _S_trunc = 1L << 5,
>      _S_ios_openmode_end = 1L << 16,
>      _S_ios_openmode_max = 0x7fffffff,
>      _S_ios_openmode_min = ~0x7fffffff
>    };
>
>  inline constexpr _Ios_Openmode
>  operator&(_Ios_Openmode __a, _Ios_Openmode __b)
>  { return _Ios_Openmode(static_cast<int>(__a) & static_cast<int>(__b)); }
>
>  inline constexpr _Ios_Openmode
>  operator|(_Ios_Openmode __a, _Ios_Openmode __b)
>  { return _Ios_Openmode(static_cast<int>(__a) | static_cast<int>(__b)); }
>
>  inline constexpr _Ios_Openmode
>  operator^(_Ios_Openmode __a, _Ios_Openmode __b)
>  { return _Ios_Openmode(static_cast<int>(__a) ^ static_cast<int>(__b)); }
>
>  inline constexpr _Ios_Openmode
>  operator~(_Ios_Openmode __a)
>  { return _Ios_Openmode(~static_cast<int>(__a)); }
>
>  inline const _Ios_Openmode&
>  operator|=(_Ios_Openmode& __a, _Ios_Openmode __b)
>  { return __a = __a | __b; }
>
>  inline const _Ios_Openmode&
>  operator&=(_Ios_Openmode& __a, _Ios_Openmode __b)
>  { return __a = __a & __b; }
>
>  inline const _Ios_Openmode&
>  operator^=(_Ios_Openmode& __a, _Ios_Openmode __b)
>  { return __a = __a ^ __b; }
>
>
>  enum _Ios_Iostate
>    {
>      _S_goodbit = 0,
>      _S_badbit = 1L << 0,
>      _S_eofbit = 1L << 1,
>      _S_failbit = 1L << 2,
>      _S_ios_iostate_end = 1L << 16,
>      _S_ios_iostate_max = 0x7fffffff,
>      _S_ios_iostate_min = ~0x7fffffff
>    };
>
>  inline constexpr _Ios_Iostate
>  operator&(_Ios_Iostate __a, _Ios_Iostate __b)
>  { return _Ios_Iostate(static_cast<int>(__a) & static_cast<int>(__b)); }
>
>  inline constexpr _Ios_Iostate
>  operator|(_Ios_Iostate __a, _Ios_Iostate __b)
>  { return _Ios_Iostate(static_cast<int>(__a) | static_cast<int>(__b)); }
>
>  inline constexpr _Ios_Iostate
>  operator^(_Ios_Iostate __a, _Ios_Iostate __b)
>  { return _Ios_Iostate(static_cast<int>(__a) ^ static_cast<int>(__b)); }
>
>  inline constexpr _Ios_Iostate
>  operator~(_Ios_Iostate __a)
>  { return _Ios_Iostate(~static_cast<int>(__a)); }
>
>  inline const _Ios_Iostate&
>  operator|=(_Ios_Iostate& __a, _Ios_Iostate __b)
>  { return __a = __a | __b; }
>
>  inline const _Ios_Iostate&
>  operator&=(_Ios_Iostate& __a, _Ios_Iostate __b)
>  { return __a = __a & __b; }
>
>  inline const _Ios_Iostate&
>  operator^=(_Ios_Iostate& __a, _Ios_Iostate __b)
>  { return __a = __a ^ __b; }
>
>
>  enum _Ios_Seekdir
>    {
>      _S_beg = 0,
>      _S_cur = 1,
>      _S_end = 2,
>      _S_ios_seekdir_end = 1L << 16
>    };
>
>
>
>  enum class io_errc { stream = 1 };
>
>  template <> struct is_error_code_enum<io_errc> : public true_type { };
>
>  const error_category& iostream_category() noexcept;
>
>  inline error_code
>  make_error_code(io_errc __e) noexcept
>  { return error_code(static_cast<int>(__e), iostream_category()); }
>
>  inline error_condition
>  make_error_condition(io_errc __e) noexcept
>  { return error_condition(static_cast<int>(__e), iostream_category()); }
># 228 "/usr/include/c++/8/bits/ios_base.h" 3
>  class ios_base
>  {
># 246 "/usr/include/c++/8/bits/ios_base.h" 3
>  public:
># 255 "/usr/include/c++/8/bits/ios_base.h" 3
>    class __attribute ((__abi_tag__ ("cxx11"))) failure : public system_error
>    {
>    public:
>      explicit
>      failure(const string& __str);
>
>
>      explicit
>      failure(const string&, const error_code&);
>
>      explicit
>      failure(const char*, const error_code& = io_errc::stream);
>
>
>      virtual
>      ~failure() throw();
>
>      virtual const char*
>      what() const throw();
>    };
># 323 "/usr/include/c++/8/bits/ios_base.h" 3
>    typedef _Ios_Fmtflags fmtflags;
>
>
>    static const fmtflags boolalpha = _S_boolalpha;
>
>
>    static const fmtflags dec = _S_dec;
>
>
>    static const fmtflags fixed = _S_fixed;
>
>
>    static const fmtflags hex = _S_hex;
>
>
>
>
>    static const fmtflags internal = _S_internal;
>
>
>
>    static const fmtflags left = _S_left;
>
>
>    static const fmtflags oct = _S_oct;
>
>
>
>    static const fmtflags right = _S_right;
>
>
>    static const fmtflags scientific = _S_scientific;
>
>
>
>    static const fmtflags showbase = _S_showbase;
>
>
>
>    static const fmtflags showpoint = _S_showpoint;
>
>
>    static const fmtflags showpos = _S_showpos;
>
>
>    static const fmtflags skipws = _S_skipws;
>
>
>    static const fmtflags unitbuf = _S_unitbuf;
>
>
>
>    static const fmtflags uppercase = _S_uppercase;
>
>
>    static const fmtflags adjustfield = _S_adjustfield;
>
>
>    static const fmtflags basefield = _S_basefield;
>
>
>    static const fmtflags floatfield = _S_floatfield;
># 398 "/usr/include/c++/8/bits/ios_base.h" 3
>    typedef _Ios_Iostate iostate;
>
>
>
>    static const iostate badbit = _S_badbit;
>
>
>    static const iostate eofbit = _S_eofbit;
>
>
>
>
>    static const iostate failbit = _S_failbit;
>
>
>    static const iostate goodbit = _S_goodbit;
># 429 "/usr/include/c++/8/bits/ios_base.h" 3
>    typedef _Ios_Openmode openmode;
>
>
>    static const openmode app = _S_app;
>
>
>    static const openmode ate = _S_ate;
>
>
>
>
>    static const openmode binary = _S_bin;
>
>
>    static const openmode in = _S_in;
>
>
>    static const openmode out = _S_out;
>
>
>    static const openmode trunc = _S_trunc;
># 461 "/usr/include/c++/8/bits/ios_base.h" 3
>    typedef _Ios_Seekdir seekdir;
>
>
>    static const seekdir beg = _S_beg;
>
>
>    static const seekdir cur = _S_cur;
>
>
>    static const seekdir end = _S_end;
>
>
>
>    typedef int io_state;
>    typedef int open_mode;
>    typedef int seek_dir;
>
>    typedef std::streampos streampos;
>    typedef std::streamoff streamoff;
># 489 "/usr/include/c++/8/bits/ios_base.h" 3
>    enum event
>    {
>      erase_event,
>      imbue_event,
>      copyfmt_event
>    };
># 506 "/usr/include/c++/8/bits/ios_base.h" 3
>    typedef void (*event_callback) (event __e, ios_base& __b, int __i);
># 518 "/usr/include/c++/8/bits/ios_base.h" 3
>    void
>    register_callback(event_callback __fn, int __index);
>
>  protected:
>    streamsize _M_precision;
>    streamsize _M_width;
>    fmtflags _M_flags;
>    iostate _M_exception;
>    iostate _M_streambuf_state;
>
>
>
>    struct _Callback_list
>    {
>
>      _Callback_list* _M_next;
>      ios_base::event_callback _M_fn;
>      int _M_index;
>      _Atomic_word _M_refcount;
>
>      _Callback_list(ios_base::event_callback __fn, int __index,
>       _Callback_list* __cb)
>      : _M_next(__cb), _M_fn(__fn), _M_index(__index), _M_refcount(0) { }
>
>      void
>      _M_add_reference() { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); }
>
>
>      int
>      _M_remove_reference()
>      {
>
>        ;
>        int __res = __gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1);
>        if (__res == 0)
>          {
>            ;
>          }
>        return __res;
>      }
>    };
>
>     _Callback_list* _M_callbacks;
>
>    void
>    _M_call_callbacks(event __ev) throw();
>
>    void
>    _M_dispose_callbacks(void) throw();
>
>
>    struct _Words
>    {
>      void* _M_pword;
>      long _M_iword;
>      _Words() : _M_pword(0), _M_iword(0) { }
>    };
>
>
>    _Words _M_word_zero;
>
>
>
>    enum { _S_local_word_size = 8 };
>    _Words _M_local_word[_S_local_word_size];
>
>
>    int _M_word_size;
>    _Words* _M_word;
>
>    _Words&
>    _M_grow_words(int __index, bool __iword);
>
>
>    locale _M_ios_locale;
>
>    void
>    _M_init() throw();
>
>  public:
>
>
>
>
>
>    class Init
>    {
>      friend class ios_base;
>    public:
>      Init();
>      ~Init();
>
>    private:
>      static _Atomic_word _S_refcount;
>      static bool _S_synced_with_stdio;
>    };
>
>
>
>
>
>
>    fmtflags
>    flags() const
>    { return _M_flags; }
># 631 "/usr/include/c++/8/bits/ios_base.h" 3
>    fmtflags
>    flags(fmtflags __fmtfl)
>    {
>      fmtflags __old = _M_flags;
>      _M_flags = __fmtfl;
>      return __old;
>    }
># 647 "/usr/include/c++/8/bits/ios_base.h" 3
>    fmtflags
>    setf(fmtflags __fmtfl)
>    {
>      fmtflags __old = _M_flags;
>      _M_flags |= __fmtfl;
>      return __old;
>    }
># 664 "/usr/include/c++/8/bits/ios_base.h" 3
>    fmtflags
>    setf(fmtflags __fmtfl, fmtflags __mask)
>    {
>      fmtflags __old = _M_flags;
>      _M_flags &= ~__mask;
>      _M_flags |= (__fmtfl & __mask);
>      return __old;
>    }
>
>
>
>
>
>
>
>    void
>    unsetf(fmtflags __mask)
>    { _M_flags &= ~__mask; }
># 690 "/usr/include/c++/8/bits/ios_base.h" 3
>    streamsize
>    precision() const
>    { return _M_precision; }
>
>
>
>
>
>
>    streamsize
>    precision(streamsize __prec)
>    {
>      streamsize __old = _M_precision;
>      _M_precision = __prec;
>      return __old;
>    }
>
>
>
>
>
>
>
>    streamsize
>    width() const
>    { return _M_width; }
>
>
>
>
>
>
>    streamsize
>    width(streamsize __wide)
>    {
>      streamsize __old = _M_width;
>      _M_width = __wide;
>      return __old;
>    }
># 741 "/usr/include/c++/8/bits/ios_base.h" 3
>    static bool
>    sync_with_stdio(bool __sync = true);
># 753 "/usr/include/c++/8/bits/ios_base.h" 3
>    locale
>    imbue(const locale& __loc) throw();
># 764 "/usr/include/c++/8/bits/ios_base.h" 3
>    locale
>    getloc() const
>    { return _M_ios_locale; }
># 775 "/usr/include/c++/8/bits/ios_base.h" 3
>    const locale&
>    _M_getloc() const
>    { return _M_ios_locale; }
># 794 "/usr/include/c++/8/bits/ios_base.h" 3
>    static int
>    xalloc() throw();
># 810 "/usr/include/c++/8/bits/ios_base.h" 3
>    long&
>    iword(int __ix)
>    {
>      _Words& __word = (__ix < _M_word_size)
>   ? _M_word[__ix] : _M_grow_words(__ix, true);
>      return __word._M_iword;
>    }
># 831 "/usr/include/c++/8/bits/ios_base.h" 3
>    void*&
>    pword(int __ix)
>    {
>      _Words& __word = (__ix < _M_word_size)
>   ? _M_word[__ix] : _M_grow_words(__ix, false);
>      return __word._M_pword;
>    }
># 848 "/usr/include/c++/8/bits/ios_base.h" 3
>    virtual ~ios_base();
>
>  protected:
>    ios_base() throw ();
># 862 "/usr/include/c++/8/bits/ios_base.h" 3
>  public:
>    ios_base(const ios_base&) = delete;
>
>    ios_base&
>    operator=(const ios_base&) = delete;
>
>  protected:
>    void
>    _M_move(ios_base&) noexcept;
>
>    void
>    _M_swap(ios_base& __rhs) noexcept;
>
>  };
>
>
>
>  inline ios_base&
>  boolalpha(ios_base& __base)
>  {
>    __base.setf(ios_base::boolalpha);
>    return __base;
>  }
>
>
>  inline ios_base&
>  noboolalpha(ios_base& __base)
>  {
>    __base.unsetf(ios_base::boolalpha);
>    return __base;
>  }
>
>
>  inline ios_base&
>  showbase(ios_base& __base)
>  {
>    __base.setf(ios_base::showbase);
>    return __base;
>  }
>
>
>  inline ios_base&
>  noshowbase(ios_base& __base)
>  {
>    __base.unsetf(ios_base::showbase);
>    return __base;
>  }
>
>
>  inline ios_base&
>  showpoint(ios_base& __base)
>  {
>    __base.setf(ios_base::showpoint);
>    return __base;
>  }
>
>
>  inline ios_base&
>  noshowpoint(ios_base& __base)
>  {
>    __base.unsetf(ios_base::showpoint);
>    return __base;
>  }
>
>
>  inline ios_base&
>  showpos(ios_base& __base)
>  {
>    __base.setf(ios_base::showpos);
>    return __base;
>  }
>
>
>  inline ios_base&
>  noshowpos(ios_base& __base)
>  {
>    __base.unsetf(ios_base::showpos);
>    return __base;
>  }
>
>
>  inline ios_base&
>  skipws(ios_base& __base)
>  {
>    __base.setf(ios_base::skipws);
>    return __base;
>  }
>
>
>  inline ios_base&
>  noskipws(ios_base& __base)
>  {
>    __base.unsetf(ios_base::skipws);
>    return __base;
>  }
>
>
>  inline ios_base&
>  uppercase(ios_base& __base)
>  {
>    __base.setf(ios_base::uppercase);
>    return __base;
>  }
>
>
>  inline ios_base&
>  nouppercase(ios_base& __base)
>  {
>    __base.unsetf(ios_base::uppercase);
>    return __base;
>  }
>
>
>  inline ios_base&
>  unitbuf(ios_base& __base)
>  {
>     __base.setf(ios_base::unitbuf);
>     return __base;
>  }
>
>
>  inline ios_base&
>  nounitbuf(ios_base& __base)
>  {
>     __base.unsetf(ios_base::unitbuf);
>     return __base;
>  }
>
>
>
>  inline ios_base&
>  internal(ios_base& __base)
>  {
>     __base.setf(ios_base::internal, ios_base::adjustfield);
>     return __base;
>  }
>
>
>  inline ios_base&
>  left(ios_base& __base)
>  {
>    __base.setf(ios_base::left, ios_base::adjustfield);
>    return __base;
>  }
>
>
>  inline ios_base&
>  right(ios_base& __base)
>  {
>    __base.setf(ios_base::right, ios_base::adjustfield);
>    return __base;
>  }
>
>
>
>  inline ios_base&
>  dec(ios_base& __base)
>  {
>    __base.setf(ios_base::dec, ios_base::basefield);
>    return __base;
>  }
>
>
>  inline ios_base&
>  hex(ios_base& __base)
>  {
>    __base.setf(ios_base::hex, ios_base::basefield);
>    return __base;
>  }
>
>
>  inline ios_base&
>  oct(ios_base& __base)
>  {
>    __base.setf(ios_base::oct, ios_base::basefield);
>    return __base;
>  }
>
>
>
>  inline ios_base&
>  fixed(ios_base& __base)
>  {
>    __base.setf(ios_base::fixed, ios_base::floatfield);
>    return __base;
>  }
>
>
>  inline ios_base&
>  scientific(ios_base& __base)
>  {
>    __base.setf(ios_base::scientific, ios_base::floatfield);
>    return __base;
>  }
>
>
>
>
>
>
>  inline ios_base&
>  hexfloat(ios_base& __base)
>  {
>    __base.setf(ios_base::fixed | ios_base::scientific, ios_base::floatfield);
>    return __base;
>  }
>
>
>  inline ios_base&
>  defaultfloat(ios_base& __base)
>  {
>    __base.unsetf(ios_base::floatfield);
>    return __base;
>  }
>
>
>
>}
># 43 "/usr/include/c++/8/ios" 2 3
># 1 "/usr/include/c++/8/streambuf" 1 3
># 36 "/usr/include/c++/8/streambuf" 3
>       
># 37 "/usr/include/c++/8/streambuf" 3
># 45 "/usr/include/c++/8/streambuf" 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>  template<typename _CharT, typename _Traits>
>    streamsize
>    __copy_streambufs_eof(basic_streambuf<_CharT, _Traits>*,
>     basic_streambuf<_CharT, _Traits>*, bool&);
># 121 "/usr/include/c++/8/streambuf" 3
>  template<typename _CharT, typename _Traits>
>    class basic_streambuf
>    {
>    public:
>
>
>
>
>
>
>      typedef _CharT char_type;
>      typedef _Traits traits_type;
>      typedef typename traits_type::int_type int_type;
>      typedef typename traits_type::pos_type pos_type;
>      typedef typename traits_type::off_type off_type;
>
>
>
>
>      typedef basic_streambuf<char_type, traits_type> __streambuf_type;
>
>
>      friend class basic_ios<char_type, traits_type>;
>      friend class basic_istream<char_type, traits_type>;
>      friend class basic_ostream<char_type, traits_type>;
>      friend class istreambuf_iterator<char_type, traits_type>;
>      friend class ostreambuf_iterator<char_type, traits_type>;
>
>      friend streamsize
>      __copy_streambufs_eof<>(basic_streambuf*, basic_streambuf*, bool&);
>
>      template<bool _IsMove, typename _CharT2>
>        friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
>            _CharT2*>::__type
>        __copy_move_a2(istreambuf_iterator<_CharT2>,
>         istreambuf_iterator<_CharT2>, _CharT2*);
>
>      template<typename _CharT2>
>        friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
>      istreambuf_iterator<_CharT2> >::__type
>        find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
>      const _CharT2&);
>
>      template<typename _CharT2, typename _Distance>
>        friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
>            void>::__type
>        advance(istreambuf_iterator<_CharT2>&, _Distance);
>
>      template<typename _CharT2, typename _Traits2>
>        friend basic_istream<_CharT2, _Traits2>&
>        operator>>(basic_istream<_CharT2, _Traits2>&, _CharT2*);
>
>      template<typename _CharT2, typename _Traits2, typename _Alloc>
>        friend basic_istream<_CharT2, _Traits2>&
>        operator>>(basic_istream<_CharT2, _Traits2>&,
>     basic_string<_CharT2, _Traits2, _Alloc>&);
>
>      template<typename _CharT2, typename _Traits2, typename _Alloc>
>        friend basic_istream<_CharT2, _Traits2>&
>        getline(basic_istream<_CharT2, _Traits2>&,
>  basic_string<_CharT2, _Traits2, _Alloc>&, _CharT2);
>
>    protected:
>
>
>
>
>
>
>
>      char_type* _M_in_beg;
>      char_type* _M_in_cur;
>      char_type* _M_in_end;
>      char_type* _M_out_beg;
>      char_type* _M_out_cur;
>      char_type* _M_out_end;
>
>
>      locale _M_buf_locale;
>
>  public:
>
>      virtual
>      ~basic_streambuf()
>      { }
># 215 "/usr/include/c++/8/streambuf" 3
>      locale
>      pubimbue(const locale& __loc)
>      {
> locale __tmp(this->getloc());
> this->imbue(__loc);
> _M_buf_locale = __loc;
> return __tmp;
>      }
># 232 "/usr/include/c++/8/streambuf" 3
>      locale
>      getloc() const
>      { return _M_buf_locale; }
># 245 "/usr/include/c++/8/streambuf" 3
>      basic_streambuf*
>      pubsetbuf(char_type* __s, streamsize __n)
>      { return this->setbuf(__s, __n); }
># 257 "/usr/include/c++/8/streambuf" 3
>      pos_type
>      pubseekoff(off_type __off, ios_base::seekdir __way,
>   ios_base::openmode __mode = ios_base::in | ios_base::out)
>      { return this->seekoff(__off, __way, __mode); }
># 269 "/usr/include/c++/8/streambuf" 3
>      pos_type
>      pubseekpos(pos_type __sp,
>   ios_base::openmode __mode = ios_base::in | ios_base::out)
>      { return this->seekpos(__sp, __mode); }
>
>
>
>
>      int
>      pubsync() { return this->sync(); }
># 290 "/usr/include/c++/8/streambuf" 3
>      streamsize
>      in_avail()
>      {
> const streamsize __ret = this->egptr() - this->gptr();
> return __ret ? __ret : this->showmanyc();
>      }
># 304 "/usr/include/c++/8/streambuf" 3
>      int_type
>      snextc()
>      {
> int_type __ret = traits_type::eof();
> if (__builtin_expect(!traits_type::eq_int_type(this->sbumpc(),
>             __ret), true))
>   __ret = this->sgetc();
> return __ret;
>      }
># 322 "/usr/include/c++/8/streambuf" 3
>      int_type
>      sbumpc()
>      {
> int_type __ret;
> if (__builtin_expect(this->gptr() < this->egptr(), true))
>   {
>     __ret = traits_type::to_int_type(*this->gptr());
>     this->gbump(1);
>   }
> else
>   __ret = this->uflow();
> return __ret;
>      }
># 344 "/usr/include/c++/8/streambuf" 3
>      int_type
>      sgetc()
>      {
> int_type __ret;
> if (__builtin_expect(this->gptr() < this->egptr(), true))
>   __ret = traits_type::to_int_type(*this->gptr());
> else
>   __ret = this->underflow();
> return __ret;
>      }
># 363 "/usr/include/c++/8/streambuf" 3
>      streamsize
>      sgetn(char_type* __s, streamsize __n)
>      { return this->xsgetn(__s, __n); }
># 378 "/usr/include/c++/8/streambuf" 3
>      int_type
>      sputbackc(char_type __c)
>      {
> int_type __ret;
> const bool __testpos = this->eback() < this->gptr();
> if (__builtin_expect(!__testpos ||
>        !traits_type::eq(__c, this->gptr()[-1]), false))
>   __ret = this->pbackfail(traits_type::to_int_type(__c));
> else
>   {
>     this->gbump(-1);
>     __ret = traits_type::to_int_type(*this->gptr());
>   }
> return __ret;
>      }
># 403 "/usr/include/c++/8/streambuf" 3
>      int_type
>      sungetc()
>      {
> int_type __ret;
> if (__builtin_expect(this->eback() < this->gptr(), true))
>   {
>     this->gbump(-1);
>     __ret = traits_type::to_int_type(*this->gptr());
>   }
> else
>   __ret = this->pbackfail();
> return __ret;
>      }
># 430 "/usr/include/c++/8/streambuf" 3
>      int_type
>      sputc(char_type __c)
>      {
> int_type __ret;
> if (__builtin_expect(this->pptr() < this->epptr(), true))
>   {
>     *this->pptr() = __c;
>     this->pbump(1);
>     __ret = traits_type::to_int_type(__c);
>   }
> else
>   __ret = this->overflow(traits_type::to_int_type(__c));
> return __ret;
>      }
># 456 "/usr/include/c++/8/streambuf" 3
>      streamsize
>      sputn(const char_type* __s, streamsize __n)
>      { return this->xsputn(__s, __n); }
>
>    protected:
># 470 "/usr/include/c++/8/streambuf" 3
>      basic_streambuf()
>      : _M_in_beg(0), _M_in_cur(0), _M_in_end(0),
>      _M_out_beg(0), _M_out_cur(0), _M_out_end(0),
>      _M_buf_locale(locale())
>      { }
># 488 "/usr/include/c++/8/streambuf" 3
>      char_type*
>      eback() const { return _M_in_beg; }
>
>      char_type*
>      gptr() const { return _M_in_cur; }
>
>      char_type*
>      egptr() const { return _M_in_end; }
># 504 "/usr/include/c++/8/streambuf" 3
>      void
>      gbump(int __n) { _M_in_cur += __n; }
># 515 "/usr/include/c++/8/streambuf" 3
>      void
>      setg(char_type* __gbeg, char_type* __gnext, char_type* __gend)
>      {
> _M_in_beg = __gbeg;
> _M_in_cur = __gnext;
> _M_in_end = __gend;
>      }
># 535 "/usr/include/c++/8/streambuf" 3
>      char_type*
>      pbase() const { return _M_out_beg; }
>
>      char_type*
>      pptr() const { return _M_out_cur; }
>
>      char_type*
>      epptr() const { return _M_out_end; }
># 551 "/usr/include/c++/8/streambuf" 3
>      void
>      pbump(int __n) { _M_out_cur += __n; }
># 561 "/usr/include/c++/8/streambuf" 3
>      void
>      setp(char_type* __pbeg, char_type* __pend)
>      {
> _M_out_beg = _M_out_cur = __pbeg;
> _M_out_end = __pend;
>      }
># 582 "/usr/include/c++/8/streambuf" 3
>      virtual void
>      imbue(const locale& __loc __attribute__ ((__unused__)))
>      { }
># 597 "/usr/include/c++/8/streambuf" 3
>      virtual basic_streambuf<char_type,_Traits>*
>      setbuf(char_type*, streamsize)
>      { return this; }
># 608 "/usr/include/c++/8/streambuf" 3
>      virtual pos_type
>      seekoff(off_type, ios_base::seekdir,
>       ios_base::openmode = ios_base::in | ios_base::out)
>      { return pos_type(off_type(-1)); }
># 620 "/usr/include/c++/8/streambuf" 3
>      virtual pos_type
>      seekpos(pos_type,
>       ios_base::openmode = ios_base::in | ios_base::out)
>      { return pos_type(off_type(-1)); }
># 633 "/usr/include/c++/8/streambuf" 3
>      virtual int
>      sync() { return 0; }
># 655 "/usr/include/c++/8/streambuf" 3
>      virtual streamsize
>      showmanyc() { return 0; }
># 671 "/usr/include/c++/8/streambuf" 3
>      virtual streamsize
>      xsgetn(char_type* __s, streamsize __n);
># 693 "/usr/include/c++/8/streambuf" 3
>      virtual int_type
>      underflow()
>      { return traits_type::eof(); }
># 706 "/usr/include/c++/8/streambuf" 3
>      virtual int_type
>      uflow()
>      {
> int_type __ret = traits_type::eof();
> const bool __testeof = traits_type::eq_int_type(this->underflow(),
>       __ret);
> if (!__testeof)
>   {
>     __ret = traits_type::to_int_type(*this->gptr());
>     this->gbump(1);
>   }
> return __ret;
>      }
># 730 "/usr/include/c++/8/streambuf" 3
>      virtual int_type
>      pbackfail(int_type __c __attribute__ ((__unused__)) = traits_type::eof())
>      { return traits_type::eof(); }
># 748 "/usr/include/c++/8/streambuf" 3
>      virtual streamsize
>      xsputn(const char_type* __s, streamsize __n);
># 774 "/usr/include/c++/8/streambuf" 3
>      virtual int_type
>      overflow(int_type __c __attribute__ ((__unused__)) = traits_type::eof())
>      { return traits_type::eof(); }
>
>
>
>    public:
># 790 "/usr/include/c++/8/streambuf" 3
>      [[__deprecated__("stossc is deprecated, use sbumpc instead")]]
>
>      void
>      stossc()
>      {
> if (this->gptr() < this->egptr())
>   this->gbump(1);
> else
>   this->uflow();
>      }
>
>
>
>      void
>      __safe_gbump(streamsize __n) { _M_in_cur += __n; }
>
>      void
>      __safe_pbump(streamsize __n) { _M_out_cur += __n; }
>
>
>
>
>    protected:
>
>      basic_streambuf(const basic_streambuf&);
>
>      basic_streambuf&
>      operator=(const basic_streambuf&);
>
>
>      void
>      swap(basic_streambuf& __sb)
>      {
> std::swap(_M_in_beg, __sb._M_in_beg);
> std::swap(_M_in_cur, __sb._M_in_cur);
> std::swap(_M_in_end, __sb._M_in_end);
> std::swap(_M_out_beg, __sb._M_out_beg);
> std::swap(_M_out_cur, __sb._M_out_cur);
> std::swap(_M_out_end, __sb._M_out_end);
> std::swap(_M_buf_locale, __sb._M_buf_locale);
>      }
>
>    };
>
>
>  template<typename _CharT, typename _Traits>
>    std::basic_streambuf<_CharT, _Traits>::
>    basic_streambuf(const basic_streambuf&) = default;
>
>  template<typename _CharT, typename _Traits>
>    std::basic_streambuf<_CharT, _Traits>&
>    std::basic_streambuf<_CharT, _Traits>::
>    operator=(const basic_streambuf&) = default;
>
>
>
>  template<>
>    streamsize
>    __copy_streambufs_eof(basic_streambuf<char>* __sbin,
>     basic_streambuf<char>* __sbout, bool& __ineof);
>
>  template<>
>    streamsize
>    __copy_streambufs_eof(basic_streambuf<wchar_t>* __sbin,
>     basic_streambuf<wchar_t>* __sbout, bool& __ineof);
>
>
>
>
>
>}
>
># 1 "/usr/include/c++/8/bits/streambuf.tcc" 1 3
># 37 "/usr/include/c++/8/bits/streambuf.tcc" 3
>       
># 38 "/usr/include/c++/8/bits/streambuf.tcc" 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  template<typename _CharT, typename _Traits>
>    streamsize
>    basic_streambuf<_CharT, _Traits>::
>    xsgetn(char_type* __s, streamsize __n)
>    {
>      streamsize __ret = 0;
>      while (__ret < __n)
> {
>   const streamsize __buf_len = this->egptr() - this->gptr();
>   if (__buf_len)
>     {
>       const streamsize __remaining = __n - __ret;
>       const streamsize __len = std::min(__buf_len, __remaining);
>       traits_type::copy(__s, this->gptr(), __len);
>       __ret += __len;
>       __s += __len;
>       this->__safe_gbump(__len);
>     }
>
>   if (__ret < __n)
>     {
>       const int_type __c = this->uflow();
>       if (!traits_type::eq_int_type(__c, traits_type::eof()))
>  {
>    traits_type::assign(*__s++, traits_type::to_char_type(__c));
>    ++__ret;
>  }
>       else
>  break;
>     }
> }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    streamsize
>    basic_streambuf<_CharT, _Traits>::
>    xsputn(const char_type* __s, streamsize __n)
>    {
>      streamsize __ret = 0;
>      while (__ret < __n)
> {
>   const streamsize __buf_len = this->epptr() - this->pptr();
>   if (__buf_len)
>     {
>       const streamsize __remaining = __n - __ret;
>       const streamsize __len = std::min(__buf_len, __remaining);
>       traits_type::copy(this->pptr(), __s, __len);
>       __ret += __len;
>       __s += __len;
>       this->__safe_pbump(__len);
>     }
>
>   if (__ret < __n)
>     {
>       int_type __c = this->overflow(traits_type::to_int_type(*__s));
>       if (!traits_type::eq_int_type(__c, traits_type::eof()))
>  {
>    ++__ret;
>    ++__s;
>  }
>       else
>  break;
>     }
> }
>      return __ret;
>    }
>
>
>
>
>  template<typename _CharT, typename _Traits>
>    streamsize
>    __copy_streambufs_eof(basic_streambuf<_CharT, _Traits>* __sbin,
>     basic_streambuf<_CharT, _Traits>* __sbout,
>     bool& __ineof)
>    {
>      streamsize __ret = 0;
>      __ineof = true;
>      typename _Traits::int_type __c = __sbin->sgetc();
>      while (!_Traits::eq_int_type(__c, _Traits::eof()))
> {
>   __c = __sbout->sputc(_Traits::to_char_type(__c));
>   if (_Traits::eq_int_type(__c, _Traits::eof()))
>     {
>       __ineof = false;
>       break;
>     }
>   ++__ret;
>   __c = __sbin->snextc();
> }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    inline streamsize
>    __copy_streambufs(basic_streambuf<_CharT, _Traits>* __sbin,
>        basic_streambuf<_CharT, _Traits>* __sbout)
>    {
>      bool __ineof;
>      return __copy_streambufs_eof(__sbin, __sbout, __ineof);
>    }
>
>
>
>
>  extern template class basic_streambuf<char>;
>  extern template
>    streamsize
>    __copy_streambufs(basic_streambuf<char>*,
>        basic_streambuf<char>*);
>  extern template
>    streamsize
>    __copy_streambufs_eof(basic_streambuf<char>*,
>     basic_streambuf<char>*, bool&);
>
>
>  extern template class basic_streambuf<wchar_t>;
>  extern template
>    streamsize
>    __copy_streambufs(basic_streambuf<wchar_t>*,
>        basic_streambuf<wchar_t>*);
>  extern template
>    streamsize
>    __copy_streambufs_eof(basic_streambuf<wchar_t>*,
>     basic_streambuf<wchar_t>*, bool&);
>
>
>
>
>}
># 863 "/usr/include/c++/8/streambuf" 2 3
># 44 "/usr/include/c++/8/ios" 2 3
># 1 "/usr/include/c++/8/bits/basic_ios.h" 1 3
># 33 "/usr/include/c++/8/bits/basic_ios.h" 3
>       
># 34 "/usr/include/c++/8/bits/basic_ios.h" 3
>
>
>
># 1 "/usr/include/c++/8/bits/locale_facets.h" 1 3
># 37 "/usr/include/c++/8/bits/locale_facets.h" 3
>       
># 38 "/usr/include/c++/8/bits/locale_facets.h" 3
>
># 1 "/usr/include/c++/8/cwctype" 1 3
># 39 "/usr/include/c++/8/cwctype" 3
>       
># 40 "/usr/include/c++/8/cwctype" 3
># 50 "/usr/include/c++/8/cwctype" 3
># 1 "/usr/include/wctype.h" 1 3 4
># 38 "/usr/include/wctype.h" 3 4
># 1 "/usr/include/bits/wctype-wchar.h" 1 3 4
># 38 "/usr/include/bits/wctype-wchar.h" 3 4
>typedef unsigned long int wctype_t;
># 56 "/usr/include/bits/wctype-wchar.h" 3 4
>enum
>{
>  __ISwupper = 0,
>  __ISwlower = 1,
>  __ISwalpha = 2,
>  __ISwdigit = 3,
>  __ISwxdigit = 4,
>  __ISwspace = 5,
>  __ISwprint = 6,
>  __ISwgraph = 7,
>  __ISwblank = 8,
>  __ISwcntrl = 9,
>  __ISwpunct = 10,
>  __ISwalnum = 11,
>
>  _ISwupper = ((__ISwupper) < 8 ? (int) ((1UL << (__ISwupper)) << 24) : ((__ISwupper) < 16 ? (int) ((1UL << (__ISwupper)) << 8) : ((__ISwupper) < 24 ? (int) ((1UL << (__ISwupper)) >> 8) : (int) ((1UL << (__ISwupper)) >> 24)))),
>  _ISwlower = ((__ISwlower) < 8 ? (int) ((1UL << (__ISwlower)) << 24) : ((__ISwlower) < 16 ? (int) ((1UL << (__ISwlower)) << 8) : ((__ISwlower) < 24 ? (int) ((1UL << (__ISwlower)) >> 8) : (int) ((1UL << (__ISwlower)) >> 24)))),
>  _ISwalpha = ((__ISwalpha) < 8 ? (int) ((1UL << (__ISwalpha)) << 24) : ((__ISwalpha) < 16 ? (int) ((1UL << (__ISwalpha)) << 8) : ((__ISwalpha) < 24 ? (int) ((1UL << (__ISwalpha)) >> 8) : (int) ((1UL << (__ISwalpha)) >> 24)))),
>  _ISwdigit = ((__ISwdigit) < 8 ? (int) ((1UL << (__ISwdigit)) << 24) : ((__ISwdigit) < 16 ? (int) ((1UL << (__ISwdigit)) << 8) : ((__ISwdigit) < 24 ? (int) ((1UL << (__ISwdigit)) >> 8) : (int) ((1UL << (__ISwdigit)) >> 24)))),
>  _ISwxdigit = ((__ISwxdigit) < 8 ? (int) ((1UL << (__ISwxdigit)) << 24) : ((__ISwxdigit) < 16 ? (int) ((1UL << (__ISwxdigit)) << 8) : ((__ISwxdigit) < 24 ? (int) ((1UL << (__ISwxdigit)) >> 8) : (int) ((1UL << (__ISwxdigit)) >> 24)))),
>  _ISwspace = ((__ISwspace) < 8 ? (int) ((1UL << (__ISwspace)) << 24) : ((__ISwspace) < 16 ? (int) ((1UL << (__ISwspace)) << 8) : ((__ISwspace) < 24 ? (int) ((1UL << (__ISwspace)) >> 8) : (int) ((1UL << (__ISwspace)) >> 24)))),
>  _ISwprint = ((__ISwprint) < 8 ? (int) ((1UL << (__ISwprint)) << 24) : ((__ISwprint) < 16 ? (int) ((1UL << (__ISwprint)) << 8) : ((__ISwprint) < 24 ? (int) ((1UL << (__ISwprint)) >> 8) : (int) ((1UL << (__ISwprint)) >> 24)))),
>  _ISwgraph = ((__ISwgraph) < 8 ? (int) ((1UL << (__ISwgraph)) << 24) : ((__ISwgraph) < 16 ? (int) ((1UL << (__ISwgraph)) << 8) : ((__ISwgraph) < 24 ? (int) ((1UL << (__ISwgraph)) >> 8) : (int) ((1UL << (__ISwgraph)) >> 24)))),
>  _ISwblank = ((__ISwblank) < 8 ? (int) ((1UL << (__ISwblank)) << 24) : ((__ISwblank) < 16 ? (int) ((1UL << (__ISwblank)) << 8) : ((__ISwblank) < 24 ? (int) ((1UL << (__ISwblank)) >> 8) : (int) ((1UL << (__ISwblank)) >> 24)))),
>  _ISwcntrl = ((__ISwcntrl) < 8 ? (int) ((1UL << (__ISwcntrl)) << 24) : ((__ISwcntrl) < 16 ? (int) ((1UL << (__ISwcntrl)) << 8) : ((__ISwcntrl) < 24 ? (int) ((1UL << (__ISwcntrl)) >> 8) : (int) ((1UL << (__ISwcntrl)) >> 24)))),
>  _ISwpunct = ((__ISwpunct) < 8 ? (int) ((1UL << (__ISwpunct)) << 24) : ((__ISwpunct) < 16 ? (int) ((1UL << (__ISwpunct)) << 8) : ((__ISwpunct) < 24 ? (int) ((1UL << (__ISwpunct)) >> 8) : (int) ((1UL << (__ISwpunct)) >> 24)))),
>  _ISwalnum = ((__ISwalnum) < 8 ? (int) ((1UL << (__ISwalnum)) << 24) : ((__ISwalnum) < 16 ? (int) ((1UL << (__ISwalnum)) << 8) : ((__ISwalnum) < 24 ? (int) ((1UL << (__ISwalnum)) >> 8) : (int) ((1UL << (__ISwalnum)) >> 24))))
>};
>
>
>
>extern "C" {
>
>
>
>
>
>
>
>extern int iswalnum (wint_t __wc) throw ();
>
>
>
>
>
>extern int iswalpha (wint_t __wc) throw ();
>
>
>extern int iswcntrl (wint_t __wc) throw ();
>
>
>
>extern int iswdigit (wint_t __wc) throw ();
>
>
>
>extern int iswgraph (wint_t __wc) throw ();
>
>
>
>
>extern int iswlower (wint_t __wc) throw ();
>
>
>extern int iswprint (wint_t __wc) throw ();
>
>
>
>
>extern int iswpunct (wint_t __wc) throw ();
>
>
>
>
>extern int iswspace (wint_t __wc) throw ();
>
>
>
>
>extern int iswupper (wint_t __wc) throw ();
>
>
>
>
>extern int iswxdigit (wint_t __wc) throw ();
>
>
>
>
>
>extern int iswblank (wint_t __wc) throw ();
># 155 "/usr/include/bits/wctype-wchar.h" 3 4
>extern wctype_t wctype (const char *__property) throw ();
>
>
>
>extern int iswctype (wint_t __wc, wctype_t __desc) throw ();
>
>
>
>
>
>
>extern wint_t towlower (wint_t __wc) throw ();
>
>
>extern wint_t towupper (wint_t __wc) throw ();
>
>}
># 39 "/usr/include/wctype.h" 2 3 4
>
>
>
>
>
>extern "C" {
>
>
>
>typedef const __int32_t *wctrans_t;
>
>
>
>extern wctrans_t wctrans (const char *__property) throw ();
>
>
>extern wint_t towctrans (wint_t __wc, wctrans_t __desc) throw ();
>
>
>
>
>
>
>
>extern int iswalnum_l (wint_t __wc, locale_t __locale) throw ();
>
>
>
>
>
>extern int iswalpha_l (wint_t __wc, locale_t __locale) throw ();
>
>
>extern int iswcntrl_l (wint_t __wc, locale_t __locale) throw ();
>
>
>
>extern int iswdigit_l (wint_t __wc, locale_t __locale) throw ();
>
>
>
>extern int iswgraph_l (wint_t __wc, locale_t __locale) throw ();
>
>
>
>
>extern int iswlower_l (wint_t __wc, locale_t __locale) throw ();
>
>
>extern int iswprint_l (wint_t __wc, locale_t __locale) throw ();
>
>
>
>
>extern int iswpunct_l (wint_t __wc, locale_t __locale) throw ();
>
>
>
>
>extern int iswspace_l (wint_t __wc, locale_t __locale) throw ();
>
>
>
>
>extern int iswupper_l (wint_t __wc, locale_t __locale) throw ();
>
>
>
>
>extern int iswxdigit_l (wint_t __wc, locale_t __locale) throw ();
>
>
>
>
>extern int iswblank_l (wint_t __wc, locale_t __locale) throw ();
>
>
>
>extern wctype_t wctype_l (const char *__property, locale_t __locale)
>     throw ();
>
>
>
>extern int iswctype_l (wint_t __wc, wctype_t __desc, locale_t __locale)
>     throw ();
>
>
>
>
>
>
>extern wint_t towlower_l (wint_t __wc, locale_t __locale) throw ();
>
>
>extern wint_t towupper_l (wint_t __wc, locale_t __locale) throw ();
>
>
>
>extern wctrans_t wctrans_l (const char *__property, locale_t __locale)
>     throw ();
>
>
>extern wint_t towctrans_l (wint_t __wc, wctrans_t __desc,
>      locale_t __locale) throw ();
>
>
>
>}
># 51 "/usr/include/c++/8/cwctype" 2 3
># 80 "/usr/include/c++/8/cwctype" 3
>namespace std
>{
>  using ::wctrans_t;
>  using ::wctype_t;
>  using ::wint_t;
>
>  using ::iswalnum;
>  using ::iswalpha;
>
>  using ::iswblank;
>
>  using ::iswcntrl;
>  using ::iswctype;
>  using ::iswdigit;
>  using ::iswgraph;
>  using ::iswlower;
>  using ::iswprint;
>  using ::iswpunct;
>  using ::iswspace;
>  using ::iswupper;
>  using ::iswxdigit;
>  using ::towctrans;
>  using ::towlower;
>  using ::towupper;
>  using ::wctrans;
>  using ::wctype;
>}
># 40 "/usr/include/c++/8/bits/locale_facets.h" 2 3
># 1 "/usr/include/c++/8/cctype" 1 3
># 39 "/usr/include/c++/8/cctype" 3
>       
># 40 "/usr/include/c++/8/cctype" 3
># 41 "/usr/include/c++/8/bits/locale_facets.h" 2 3
># 1 "/usr/include/c++/8/x86_64-redhat-linux/bits/ctype_base.h" 1 3
># 36 "/usr/include/c++/8/x86_64-redhat-linux/bits/ctype_base.h" 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>  struct ctype_base
>  {
>
>    typedef const int* __to_type;
>
>
>
>    typedef unsigned short mask;
>    static const mask upper = _ISupper;
>    static const mask lower = _ISlower;
>    static const mask alpha = _ISalpha;
>    static const mask digit = _ISdigit;
>    static const mask xdigit = _ISxdigit;
>    static const mask space = _ISspace;
>    static const mask print = _ISprint;
>    static const mask graph = _ISalpha | _ISdigit | _ISpunct;
>    static const mask cntrl = _IScntrl;
>    static const mask punct = _ISpunct;
>    static const mask alnum = _ISalpha | _ISdigit;
>
>    static const mask blank = _ISblank;
>
>  };
>
>
>}
># 42 "/usr/include/c++/8/bits/locale_facets.h" 2 3
>
>
>
>
>
>
># 1 "/usr/include/c++/8/bits/streambuf_iterator.h" 1 3
># 33 "/usr/include/c++/8/bits/streambuf_iterator.h" 3
>       
># 34 "/usr/include/c++/8/bits/streambuf_iterator.h" 3
>
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 49 "/usr/include/c++/8/bits/streambuf_iterator.h" 3
>  template<typename _CharT, typename _Traits>
>    class istreambuf_iterator
>    : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
>        _CharT*,
>
>
>        _CharT>
>
>
>
>    {
>    public:
>
>
>
>      typedef _CharT char_type;
>      typedef _Traits traits_type;
>      typedef typename _Traits::int_type int_type;
>      typedef basic_streambuf<_CharT, _Traits> streambuf_type;
>      typedef basic_istream<_CharT, _Traits> istream_type;
>
>
>      template<typename _CharT2>
> friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
>        ostreambuf_iterator<_CharT2> >::__type
> copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
>      ostreambuf_iterator<_CharT2>);
>
>      template<bool _IsMove, typename _CharT2>
> friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
>            _CharT2*>::__type
> __copy_move_a2(istreambuf_iterator<_CharT2>,
>         istreambuf_iterator<_CharT2>, _CharT2*);
>
>      template<typename _CharT2>
> friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
>        istreambuf_iterator<_CharT2> >::__type
> find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
>      const _CharT2&);
>
>      template<typename _CharT2, typename _Distance>
> friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
>            void>::__type
> advance(istreambuf_iterator<_CharT2>&, _Distance);
>
>    private:
>
>
>
>
>
>
>
>      mutable streambuf_type* _M_sbuf;
>      int_type _M_c;
>
>    public:
>
>      constexpr istreambuf_iterator() noexcept
>      : _M_sbuf(0), _M_c(traits_type::eof()) { }
>
>
>      istreambuf_iterator(const istreambuf_iterator&) noexcept = default;
>
>      ~istreambuf_iterator() = default;
>
>
>
>      istreambuf_iterator(istream_type& __s) noexcept
>      : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }
>
>
>      istreambuf_iterator(streambuf_type* __s) noexcept
>      : _M_sbuf(__s), _M_c(traits_type::eof()) { }
>
>
>
>
>      char_type
>      operator*() const
>      {
> int_type __c = _M_get();
># 139 "/usr/include/c++/8/bits/streambuf_iterator.h" 3
> return traits_type::to_char_type(__c);
>      }
>
>
>      istreambuf_iterator&
>      operator++()
>      {
>
>
>
>                        ;
>
> _M_sbuf->sbumpc();
> _M_c = traits_type::eof();
> return *this;
>      }
>
>
>      istreambuf_iterator
>      operator++(int)
>      {
>
>
>
>                        ;
>
> istreambuf_iterator __old = *this;
> __old._M_c = _M_sbuf->sbumpc();
> _M_c = traits_type::eof();
> return __old;
>      }
>
>
>
>
>
>      bool
>      equal(const istreambuf_iterator& __b) const
>      { return _M_at_eof() == __b._M_at_eof(); }
>
>    private:
>      int_type
>      _M_get() const
>      {
> int_type __ret = _M_c;
> if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc()))
>   _M_sbuf = 0;
> return __ret;
>      }
>
>      bool
>      _M_at_eof() const
>      { return _S_is_eof(_M_get()); }
>
>      static bool
>      _S_is_eof(int_type __c)
>      {
> const int_type __eof = traits_type::eof();
> return traits_type::eq_int_type(__c, __eof);
>      }
>    };
>
>  template<typename _CharT, typename _Traits>
>    inline bool
>    operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
>        const istreambuf_iterator<_CharT, _Traits>& __b)
>    { return __a.equal(__b); }
>
>  template<typename _CharT, typename _Traits>
>    inline bool
>    operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
>        const istreambuf_iterator<_CharT, _Traits>& __b)
>    { return !__a.equal(__b); }
>
>
>  template<typename _CharT, typename _Traits>
>    class ostreambuf_iterator
>    : public iterator<output_iterator_tag, void, void, void, void>
>    {
>    public:
>
>
>
>      typedef _CharT char_type;
>      typedef _Traits traits_type;
>      typedef basic_streambuf<_CharT, _Traits> streambuf_type;
>      typedef basic_ostream<_CharT, _Traits> ostream_type;
>
>
>      template<typename _CharT2>
> friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
>        ostreambuf_iterator<_CharT2> >::__type
> copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
>      ostreambuf_iterator<_CharT2>);
>
>    private:
>      streambuf_type* _M_sbuf;
>      bool _M_failed;
>
>    public:
>
>      ostreambuf_iterator(ostream_type& __s) noexcept
>      : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }
>
>
>      ostreambuf_iterator(streambuf_type* __s) noexcept
>      : _M_sbuf(__s), _M_failed(!_M_sbuf) { }
>
>
>      ostreambuf_iterator&
>      operator=(_CharT __c)
>      {
> if (!_M_failed &&
>     _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))
>   _M_failed = true;
> return *this;
>      }
>
>
>      ostreambuf_iterator&
>      operator*()
>      { return *this; }
>
>
>      ostreambuf_iterator&
>      operator++(int)
>      { return *this; }
>
>
>      ostreambuf_iterator&
>      operator++()
>      { return *this; }
>
>
>      bool
>      failed() const noexcept
>      { return _M_failed; }
>
>      ostreambuf_iterator&
>      _M_put(const _CharT* __ws, streamsize __len)
>      {
> if (__builtin_expect(!_M_failed, true)
>     && __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,
>    false))
>   _M_failed = true;
> return *this;
>      }
>    };
>
>
>  template<typename _CharT>
>    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
>        ostreambuf_iterator<_CharT> >::__type
>    copy(istreambuf_iterator<_CharT> __first,
>  istreambuf_iterator<_CharT> __last,
>  ostreambuf_iterator<_CharT> __result)
>    {
>      if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed)
> {
>   bool __ineof;
>   __copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof);
>   if (!__ineof)
>     __result._M_failed = true;
> }
>      return __result;
>    }
>
>  template<bool _IsMove, typename _CharT>
>    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
>        ostreambuf_iterator<_CharT> >::__type
>    __copy_move_a2(_CharT* __first, _CharT* __last,
>     ostreambuf_iterator<_CharT> __result)
>    {
>      const streamsize __num = __last - __first;
>      if (__num > 0)
> __result._M_put(__first, __num);
>      return __result;
>    }
>
>  template<bool _IsMove, typename _CharT>
>    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
>        ostreambuf_iterator<_CharT> >::__type
>    __copy_move_a2(const _CharT* __first, const _CharT* __last,
>     ostreambuf_iterator<_CharT> __result)
>    {
>      const streamsize __num = __last - __first;
>      if (__num > 0)
> __result._M_put(__first, __num);
>      return __result;
>    }
>
>  template<bool _IsMove, typename _CharT>
>    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
>        _CharT*>::__type
>    __copy_move_a2(istreambuf_iterator<_CharT> __first,
>     istreambuf_iterator<_CharT> __last, _CharT* __result)
>    {
>      typedef istreambuf_iterator<_CharT> __is_iterator_type;
>      typedef typename __is_iterator_type::traits_type traits_type;
>      typedef typename __is_iterator_type::streambuf_type streambuf_type;
>      typedef typename traits_type::int_type int_type;
>
>      if (__first._M_sbuf && !__last._M_sbuf)
> {
>   streambuf_type* __sb = __first._M_sbuf;
>   int_type __c = __sb->sgetc();
>   while (!traits_type::eq_int_type(__c, traits_type::eof()))
>     {
>       const streamsize __n = __sb->egptr() - __sb->gptr();
>       if (__n > 1)
>  {
>    traits_type::copy(__result, __sb->gptr(), __n);
>    __sb->__safe_gbump(__n);
>    __result += __n;
>    __c = __sb->underflow();
>  }
>       else
>  {
>    *__result++ = traits_type::to_char_type(__c);
>    __c = __sb->snextc();
>  }
>     }
> }
>      return __result;
>    }
>
>  template<typename _CharT>
>    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
>          istreambuf_iterator<_CharT> >::__type
>    find(istreambuf_iterator<_CharT> __first,
>  istreambuf_iterator<_CharT> __last, const _CharT& __val)
>    {
>      typedef istreambuf_iterator<_CharT> __is_iterator_type;
>      typedef typename __is_iterator_type::traits_type traits_type;
>      typedef typename __is_iterator_type::streambuf_type streambuf_type;
>      typedef typename traits_type::int_type int_type;
>      const int_type __eof = traits_type::eof();
>
>      if (__first._M_sbuf && !__last._M_sbuf)
> {
>   const int_type __ival = traits_type::to_int_type(__val);
>   streambuf_type* __sb = __first._M_sbuf;
>   int_type __c = __sb->sgetc();
>   while (!traits_type::eq_int_type(__c, __eof)
>   && !traits_type::eq_int_type(__c, __ival))
>     {
>       streamsize __n = __sb->egptr() - __sb->gptr();
>       if (__n > 1)
>  {
>    const _CharT* __p = traits_type::find(__sb->gptr(),
>       __n, __val);
>    if (__p)
>      __n = __p - __sb->gptr();
>    __sb->__safe_gbump(__n);
>    __c = __sb->sgetc();
>  }
>       else
>  __c = __sb->snextc();
>     }
>
>   __first._M_c = __eof;
> }
>
>      return __first;
>    }
>
>  template<typename _CharT, typename _Distance>
>    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
>        void>::__type
>    advance(istreambuf_iterator<_CharT>& __i, _Distance __n)
>    {
>      if (__n == 0)
> return;
>
>      ;
>     
>
>                           ;
>
>      typedef istreambuf_iterator<_CharT> __is_iterator_type;
>      typedef typename __is_iterator_type::traits_type traits_type;
>      typedef typename __is_iterator_type::streambuf_type streambuf_type;
>      typedef typename traits_type::int_type int_type;
>      const int_type __eof = traits_type::eof();
>
>      streambuf_type* __sb = __i._M_sbuf;
>      while (__n > 0)
> {
>   streamsize __size = __sb->egptr() - __sb->gptr();
>   if (__size > __n)
>     {
>       __sb->__safe_gbump(__n);
>       break;
>     }
>
>   __sb->__safe_gbump(__size);
>   __n -= __size;
>   if (traits_type::eq_int_type(__sb->underflow(), __eof))
>     {
>      
>
>                      ;
>       break;
>     }
> }
>
>      __i._M_c = __eof;
>    }
>
>
>
>
>}
># 49 "/usr/include/c++/8/bits/locale_facets.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 71 "/usr/include/c++/8/bits/locale_facets.h" 3
>  template<typename _Tp>
>    void
>    __convert_to_v(const char*, _Tp&, ios_base::iostate&,
>     const __c_locale&) throw();
>
>
>  template<>
>    void
>    __convert_to_v(const char*, float&, ios_base::iostate&,
>     const __c_locale&) throw();
>
>  template<>
>    void
>    __convert_to_v(const char*, double&, ios_base::iostate&,
>     const __c_locale&) throw();
>
>  template<>
>    void
>    __convert_to_v(const char*, long double&, ios_base::iostate&,
>     const __c_locale&) throw();
>
>
>
>  template<typename _CharT, typename _Traits>
>    struct __pad
>    {
>      static void
>      _S_pad(ios_base& __io, _CharT __fill, _CharT* __news,
>      const _CharT* __olds, streamsize __newlen, streamsize __oldlen);
>    };
>
>
>
>
>
>
>  template<typename _CharT>
>    _CharT*
>    __add_grouping(_CharT* __s, _CharT __sep,
>     const char* __gbeg, size_t __gsize,
>     const _CharT* __first, const _CharT* __last);
>
>
>
>
>  template<typename _CharT>
>    inline
>    ostreambuf_iterator<_CharT>
>    __write(ostreambuf_iterator<_CharT> __s, const _CharT* __ws, int __len)
>    {
>      __s._M_put(__ws, __len);
>      return __s;
>    }
>
>
>  template<typename _CharT, typename _OutIter>
>    inline
>    _OutIter
>    __write(_OutIter __s, const _CharT* __ws, int __len)
>    {
>      for (int __j = 0; __j < __len; __j++, ++__s)
> *__s = __ws[__j];
>      return __s;
>    }
># 149 "/usr/include/c++/8/bits/locale_facets.h" 3
>  template<typename _CharT>
>    class __ctype_abstract_base : public locale::facet, public ctype_base
>    {
>    public:
>
>
>      typedef _CharT char_type;
># 168 "/usr/include/c++/8/bits/locale_facets.h" 3
>      bool
>      is(mask __m, char_type __c) const
>      { return this->do_is(__m, __c); }
># 185 "/usr/include/c++/8/bits/locale_facets.h" 3
>      const char_type*
>      is(const char_type *__lo, const char_type *__hi, mask *__vec) const
>      { return this->do_is(__lo, __hi, __vec); }
># 201 "/usr/include/c++/8/bits/locale_facets.h" 3
>      const char_type*
>      scan_is(mask __m, const char_type* __lo, const char_type* __hi) const
>      { return this->do_scan_is(__m, __lo, __hi); }
># 217 "/usr/include/c++/8/bits/locale_facets.h" 3
>      const char_type*
>      scan_not(mask __m, const char_type* __lo, const char_type* __hi) const
>      { return this->do_scan_not(__m, __lo, __hi); }
># 231 "/usr/include/c++/8/bits/locale_facets.h" 3
>      char_type
>      toupper(char_type __c) const
>      { return this->do_toupper(__c); }
># 246 "/usr/include/c++/8/bits/locale_facets.h" 3
>      const char_type*
>      toupper(char_type *__lo, const char_type* __hi) const
>      { return this->do_toupper(__lo, __hi); }
># 260 "/usr/include/c++/8/bits/locale_facets.h" 3
>      char_type
>      tolower(char_type __c) const
>      { return this->do_tolower(__c); }
># 275 "/usr/include/c++/8/bits/locale_facets.h" 3
>      const char_type*
>      tolower(char_type* __lo, const char_type* __hi) const
>      { return this->do_tolower(__lo, __hi); }
># 292 "/usr/include/c++/8/bits/locale_facets.h" 3
>      char_type
>      widen(char __c) const
>      { return this->do_widen(__c); }
># 311 "/usr/include/c++/8/bits/locale_facets.h" 3
>      const char*
>      widen(const char* __lo, const char* __hi, char_type* __to) const
>      { return this->do_widen(__lo, __hi, __to); }
># 330 "/usr/include/c++/8/bits/locale_facets.h" 3
>      char
>      narrow(char_type __c, char __dfault) const
>      { return this->do_narrow(__c, __dfault); }
># 352 "/usr/include/c++/8/bits/locale_facets.h" 3
>      const char_type*
>      narrow(const char_type* __lo, const char_type* __hi,
>       char __dfault, char* __to) const
>      { return this->do_narrow(__lo, __hi, __dfault, __to); }
>
>    protected:
>      explicit
>      __ctype_abstract_base(size_t __refs = 0): facet(__refs) { }
>
>      virtual
>      ~__ctype_abstract_base() { }
># 377 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual bool
>      do_is(mask __m, char_type __c) const = 0;
># 396 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_is(const char_type* __lo, const char_type* __hi,
>     mask* __vec) const = 0;
># 415 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_scan_is(mask __m, const char_type* __lo,
>   const char_type* __hi) const = 0;
># 434 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_scan_not(mask __m, const char_type* __lo,
>    const char_type* __hi) const = 0;
># 452 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char_type
>      do_toupper(char_type __c) const = 0;
># 469 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_toupper(char_type* __lo, const char_type* __hi) const = 0;
># 485 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char_type
>      do_tolower(char_type __c) const = 0;
># 502 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_tolower(char_type* __lo, const char_type* __hi) const = 0;
># 521 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char_type
>      do_widen(char __c) const = 0;
># 542 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char*
>      do_widen(const char* __lo, const char* __hi, char_type* __to) const = 0;
># 563 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char
>      do_narrow(char_type __c, char __dfault) const = 0;
># 588 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_narrow(const char_type* __lo, const char_type* __hi,
>  char __dfault, char* __to) const = 0;
>    };
># 611 "/usr/include/c++/8/bits/locale_facets.h" 3
>  template<typename _CharT>
>    class ctype : public __ctype_abstract_base<_CharT>
>    {
>    public:
>
>      typedef _CharT char_type;
>      typedef typename __ctype_abstract_base<_CharT>::mask mask;
>
>
>      static locale::id id;
>
>      explicit
>      ctype(size_t __refs = 0) : __ctype_abstract_base<_CharT>(__refs) { }
>
>   protected:
>      virtual
>      ~ctype();
>
>      virtual bool
>      do_is(mask __m, char_type __c) const;
>
>      virtual const char_type*
>      do_is(const char_type* __lo, const char_type* __hi, mask* __vec) const;
>
>      virtual const char_type*
>      do_scan_is(mask __m, const char_type* __lo, const char_type* __hi) const;
>
>      virtual const char_type*
>      do_scan_not(mask __m, const char_type* __lo,
>    const char_type* __hi) const;
>
>      virtual char_type
>      do_toupper(char_type __c) const;
>
>      virtual const char_type*
>      do_toupper(char_type* __lo, const char_type* __hi) const;
>
>      virtual char_type
>      do_tolower(char_type __c) const;
>
>      virtual const char_type*
>      do_tolower(char_type* __lo, const char_type* __hi) const;
>
>      virtual char_type
>      do_widen(char __c) const;
>
>      virtual const char*
>      do_widen(const char* __lo, const char* __hi, char_type* __dest) const;
>
>      virtual char
>      do_narrow(char_type, char __dfault) const;
>
>      virtual const char_type*
>      do_narrow(const char_type* __lo, const char_type* __hi,
>  char __dfault, char* __to) const;
>    };
>
>  template<typename _CharT>
>    locale::id ctype<_CharT>::id;
># 680 "/usr/include/c++/8/bits/locale_facets.h" 3
>  template<>
>    class ctype<char> : public locale::facet, public ctype_base
>    {
>    public:
>
>
>      typedef char char_type;
>
>    protected:
>
>      __c_locale _M_c_locale_ctype;
>      bool _M_del;
>      __to_type _M_toupper;
>      __to_type _M_tolower;
>      const mask* _M_table;
>      mutable char _M_widen_ok;
>      mutable char _M_widen[1 + static_cast<unsigned char>(-1)];
>      mutable char _M_narrow[1 + static_cast<unsigned char>(-1)];
>      mutable char _M_narrow_ok;
>
>
>    public:
>
>      static locale::id id;
>
>      static const size_t table_size = 1 + static_cast<unsigned char>(-1);
># 717 "/usr/include/c++/8/bits/locale_facets.h" 3
>      explicit
>      ctype(const mask* __table = 0, bool __del = false, size_t __refs = 0);
># 730 "/usr/include/c++/8/bits/locale_facets.h" 3
>      explicit
>      ctype(__c_locale __cloc, const mask* __table = 0, bool __del = false,
>     size_t __refs = 0);
># 743 "/usr/include/c++/8/bits/locale_facets.h" 3
>      inline bool
>      is(mask __m, char __c) const;
># 758 "/usr/include/c++/8/bits/locale_facets.h" 3
>      inline const char*
>      is(const char* __lo, const char* __hi, mask* __vec) const;
># 772 "/usr/include/c++/8/bits/locale_facets.h" 3
>      inline const char*
>      scan_is(mask __m, const char* __lo, const char* __hi) const;
># 786 "/usr/include/c++/8/bits/locale_facets.h" 3
>      inline const char*
>      scan_not(mask __m, const char* __lo, const char* __hi) const;
># 801 "/usr/include/c++/8/bits/locale_facets.h" 3
>      char_type
>      toupper(char_type __c) const
>      { return this->do_toupper(__c); }
># 818 "/usr/include/c++/8/bits/locale_facets.h" 3
>      const char_type*
>      toupper(char_type *__lo, const char_type* __hi) const
>      { return this->do_toupper(__lo, __hi); }
># 834 "/usr/include/c++/8/bits/locale_facets.h" 3
>      char_type
>      tolower(char_type __c) const
>      { return this->do_tolower(__c); }
># 851 "/usr/include/c++/8/bits/locale_facets.h" 3
>      const char_type*
>      tolower(char_type* __lo, const char_type* __hi) const
>      { return this->do_tolower(__lo, __hi); }
># 871 "/usr/include/c++/8/bits/locale_facets.h" 3
>      char_type
>      widen(char __c) const
>      {
> if (_M_widen_ok)
>   return _M_widen[static_cast<unsigned char>(__c)];
> this->_M_widen_init();
> return this->do_widen(__c);
>      }
># 898 "/usr/include/c++/8/bits/locale_facets.h" 3
>      const char*
>      widen(const char* __lo, const char* __hi, char_type* __to) const
>      {
> if (_M_widen_ok == 1)
>   {
>     __builtin_memcpy(__to, __lo, __hi - __lo);
>     return __hi;
>   }
> if (!_M_widen_ok)
>   _M_widen_init();
> return this->do_widen(__lo, __hi, __to);
>      }
># 929 "/usr/include/c++/8/bits/locale_facets.h" 3
>      char
>      narrow(char_type __c, char __dfault) const
>      {
> if (_M_narrow[static_cast<unsigned char>(__c)])
>   return _M_narrow[static_cast<unsigned char>(__c)];
> const char __t = do_narrow(__c, __dfault);
> if (__t != __dfault)
>   _M_narrow[static_cast<unsigned char>(__c)] = __t;
> return __t;
>      }
># 962 "/usr/include/c++/8/bits/locale_facets.h" 3
>      const char_type*
>      narrow(const char_type* __lo, const char_type* __hi,
>      char __dfault, char* __to) const
>      {
> if (__builtin_expect(_M_narrow_ok == 1, true))
>   {
>     __builtin_memcpy(__to, __lo, __hi - __lo);
>     return __hi;
>   }
> if (!_M_narrow_ok)
>   _M_narrow_init();
> return this->do_narrow(__lo, __hi, __dfault, __to);
>      }
>
>
>
>
>
>      const mask*
>      table() const throw()
>      { return _M_table; }
>
>
>      static const mask*
>      classic_table() throw();
>    protected:
>
>
>
>
>
>
>
>      virtual
>      ~ctype();
># 1011 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char_type
>      do_toupper(char_type __c) const;
># 1028 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_toupper(char_type* __lo, const char_type* __hi) const;
># 1044 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char_type
>      do_tolower(char_type __c) const;
># 1061 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_tolower(char_type* __lo, const char_type* __hi) const;
># 1081 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char_type
>      do_widen(char __c) const
>      { return __c; }
># 1104 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char*
>      do_widen(const char* __lo, const char* __hi, char_type* __to) const
>      {
> __builtin_memcpy(__to, __lo, __hi - __lo);
> return __hi;
>      }
># 1130 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char
>      do_narrow(char_type __c, char __dfault __attribute__((__unused__))) const
>      { return __c; }
># 1156 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_narrow(const char_type* __lo, const char_type* __hi,
>  char __dfault __attribute__((__unused__)), char* __to) const
>      {
> __builtin_memcpy(__to, __lo, __hi - __lo);
> return __hi;
>      }
>
>    private:
>      void _M_narrow_init() const;
>      void _M_widen_init() const;
>    };
># 1181 "/usr/include/c++/8/bits/locale_facets.h" 3
>  template<>
>    class ctype<wchar_t> : public __ctype_abstract_base<wchar_t>
>    {
>    public:
>
>
>      typedef wchar_t char_type;
>      typedef wctype_t __wmask_type;
>
>    protected:
>      __c_locale _M_c_locale_ctype;
>
>
>      bool _M_narrow_ok;
>      char _M_narrow[128];
>      wint_t _M_widen[1 + static_cast<unsigned char>(-1)];
>
>
>      mask _M_bit[16];
>      __wmask_type _M_wmask[16];
>
>    public:
>
>
>      static locale::id id;
># 1214 "/usr/include/c++/8/bits/locale_facets.h" 3
>      explicit
>      ctype(size_t __refs = 0);
># 1225 "/usr/include/c++/8/bits/locale_facets.h" 3
>      explicit
>      ctype(__c_locale __cloc, size_t __refs = 0);
>
>    protected:
>      __wmask_type
>      _M_convert_to_wmask(const mask __m) const throw();
>
>
>      virtual
>      ~ctype();
># 1249 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual bool
>      do_is(mask __m, char_type __c) const;
># 1268 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_is(const char_type* __lo, const char_type* __hi, mask* __vec) const;
># 1286 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_scan_is(mask __m, const char_type* __lo, const char_type* __hi) const;
># 1304 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_scan_not(mask __m, const char_type* __lo,
>    const char_type* __hi) const;
># 1321 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char_type
>      do_toupper(char_type __c) const;
># 1338 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_toupper(char_type* __lo, const char_type* __hi) const;
># 1354 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char_type
>      do_tolower(char_type __c) const;
># 1371 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_tolower(char_type* __lo, const char_type* __hi) const;
># 1391 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char_type
>      do_widen(char __c) const;
># 1413 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char*
>      do_widen(const char* __lo, const char* __hi, char_type* __to) const;
># 1436 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char
>      do_narrow(char_type __c, char __dfault) const;
># 1462 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual const char_type*
>      do_narrow(const char_type* __lo, const char_type* __hi,
>  char __dfault, char* __to) const;
>
>
>      void
>      _M_initialize_ctype() throw();
>    };
>
>
>
>  template<typename _CharT>
>    class ctype_byname : public ctype<_CharT>
>    {
>    public:
>      typedef typename ctype<_CharT>::mask mask;
>
>      explicit
>      ctype_byname(const char* __s, size_t __refs = 0);
>
>
>      explicit
>      ctype_byname(const string& __s, size_t __refs = 0)
>      : ctype_byname(__s.c_str(), __refs) { }
>
>
>    protected:
>      virtual
>      ~ctype_byname() { }
>    };
>
>
>  template<>
>    class ctype_byname<char> : public ctype<char>
>    {
>    public:
>      explicit
>      ctype_byname(const char* __s, size_t __refs = 0);
>
>
>      explicit
>      ctype_byname(const string& __s, size_t __refs = 0);
>
>
>    protected:
>      virtual
>      ~ctype_byname();
>    };
>
>
>  template<>
>    class ctype_byname<wchar_t> : public ctype<wchar_t>
>    {
>    public:
>      explicit
>      ctype_byname(const char* __s, size_t __refs = 0);
>
>
>      explicit
>      ctype_byname(const string& __s, size_t __refs = 0);
>
>
>    protected:
>      virtual
>      ~ctype_byname();
>    };
>
>
>
>}
>
>
># 1 "/usr/include/c++/8/x86_64-redhat-linux/bits/ctype_inline.h" 1 3
># 37 "/usr/include/c++/8/x86_64-redhat-linux/bits/ctype_inline.h" 3
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  bool
>  ctype<char>::
>  is(mask __m, char __c) const
>  { return _M_table[static_cast<unsigned char>(__c)] & __m; }
>
>  const char*
>  ctype<char>::
>  is(const char* __low, const char* __high, mask* __vec) const
>  {
>    while (__low < __high)
>      *__vec++ = _M_table[static_cast<unsigned char>(*__low++)];
>    return __high;
>  }
>
>  const char*
>  ctype<char>::
>  scan_is(mask __m, const char* __low, const char* __high) const
>  {
>    while (__low < __high
>    && !(_M_table[static_cast<unsigned char>(*__low)] & __m))
>      ++__low;
>    return __low;
>  }
>
>  const char*
>  ctype<char>::
>  scan_not(mask __m, const char* __low, const char* __high) const
>  {
>    while (__low < __high
>    && (_M_table[static_cast<unsigned char>(*__low)] & __m) != 0)
>      ++__low;
>    return __low;
>  }
>
>
>}
># 1535 "/usr/include/c++/8/bits/locale_facets.h" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>  class __num_base
>  {
>  public:
>
>
>    enum
>      {
> _S_ominus,
> _S_oplus,
> _S_ox,
> _S_oX,
> _S_odigits,
> _S_odigits_end = _S_odigits + 16,
> _S_oudigits = _S_odigits_end,
> _S_oudigits_end = _S_oudigits + 16,
> _S_oe = _S_odigits + 14,
> _S_oE = _S_oudigits + 14,
> _S_oend = _S_oudigits_end
>      };
>
>
>
>
>
>
>    static const char* _S_atoms_out;
>
>
>
>    static const char* _S_atoms_in;
>
>    enum
>    {
>      _S_iminus,
>      _S_iplus,
>      _S_ix,
>      _S_iX,
>      _S_izero,
>      _S_ie = _S_izero + 14,
>      _S_iE = _S_izero + 20,
>      _S_iend = 26
>    };
>
>
>
>    static void
>    _S_format_float(const ios_base& __io, char* __fptr, char __mod) throw();
>  };
>
>  template<typename _CharT>
>    struct __numpunct_cache : public locale::facet
>    {
>      const char* _M_grouping;
>      size_t _M_grouping_size;
>      bool _M_use_grouping;
>      const _CharT* _M_truename;
>      size_t _M_truename_size;
>      const _CharT* _M_falsename;
>      size_t _M_falsename_size;
>      _CharT _M_decimal_point;
>      _CharT _M_thousands_sep;
>
>
>
>
>
>      _CharT _M_atoms_out[__num_base::_S_oend];
>
>
>
>
>
>      _CharT _M_atoms_in[__num_base::_S_iend];
>
>      bool _M_allocated;
>
>      __numpunct_cache(size_t __refs = 0)
>      : facet(__refs), _M_grouping(0), _M_grouping_size(0),
> _M_use_grouping(false),
> _M_truename(0), _M_truename_size(0), _M_falsename(0),
> _M_falsename_size(0), _M_decimal_point(_CharT()),
> _M_thousands_sep(_CharT()), _M_allocated(false)
> { }
>
>      ~__numpunct_cache();
>
>      void
>      _M_cache(const locale& __loc);
>
>    private:
>      __numpunct_cache&
>      operator=(const __numpunct_cache&);
>
>      explicit
>      __numpunct_cache(const __numpunct_cache&);
>    };
>
>  template<typename _CharT>
>    __numpunct_cache<_CharT>::~__numpunct_cache()
>    {
>      if (_M_allocated)
> {
>   delete [] _M_grouping;
>   delete [] _M_truename;
>   delete [] _M_falsename;
> }
>    }
>
>namespace __cxx11 {
># 1665 "/usr/include/c++/8/bits/locale_facets.h" 3
>  template<typename _CharT>
>    class numpunct : public locale::facet
>    {
>    public:
>
>
>
>      typedef _CharT char_type;
>      typedef basic_string<_CharT> string_type;
>
>      typedef __numpunct_cache<_CharT> __cache_type;
>
>    protected:
>      __cache_type* _M_data;
>
>    public:
>
>      static locale::id id;
>
>
>
>
>
>
>      explicit
>      numpunct(size_t __refs = 0)
>      : facet(__refs), _M_data(0)
>      { _M_initialize_numpunct(); }
># 1703 "/usr/include/c++/8/bits/locale_facets.h" 3
>      explicit
>      numpunct(__cache_type* __cache, size_t __refs = 0)
>      : facet(__refs), _M_data(__cache)
>      { _M_initialize_numpunct(); }
># 1717 "/usr/include/c++/8/bits/locale_facets.h" 3
>      explicit
>      numpunct(__c_locale __cloc, size_t __refs = 0)
>      : facet(__refs), _M_data(0)
>      { _M_initialize_numpunct(__cloc); }
># 1731 "/usr/include/c++/8/bits/locale_facets.h" 3
>      char_type
>      decimal_point() const
>      { return this->do_decimal_point(); }
># 1744 "/usr/include/c++/8/bits/locale_facets.h" 3
>      char_type
>      thousands_sep() const
>      { return this->do_thousands_sep(); }
># 1775 "/usr/include/c++/8/bits/locale_facets.h" 3
>      string
>      grouping() const
>      { return this->do_grouping(); }
># 1788 "/usr/include/c++/8/bits/locale_facets.h" 3
>      string_type
>      truename() const
>      { return this->do_truename(); }
># 1801 "/usr/include/c++/8/bits/locale_facets.h" 3
>      string_type
>      falsename() const
>      { return this->do_falsename(); }
>
>    protected:
>
>      virtual
>      ~numpunct();
># 1818 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char_type
>      do_decimal_point() const
>      { return _M_data->_M_decimal_point; }
># 1830 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual char_type
>      do_thousands_sep() const
>      { return _M_data->_M_thousands_sep; }
># 1843 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual string
>      do_grouping() const
>      { return _M_data->_M_grouping; }
># 1856 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual string_type
>      do_truename() const
>      { return _M_data->_M_truename; }
># 1869 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual string_type
>      do_falsename() const
>      { return _M_data->_M_falsename; }
>
>
>      void
>      _M_initialize_numpunct(__c_locale __cloc = 0);
>    };
>
>  template<typename _CharT>
>    locale::id numpunct<_CharT>::id;
>
>  template<>
>    numpunct<char>::~numpunct();
>
>  template<>
>    void
>    numpunct<char>::_M_initialize_numpunct(__c_locale __cloc);
>
>
>  template<>
>    numpunct<wchar_t>::~numpunct();
>
>  template<>
>    void
>    numpunct<wchar_t>::_M_initialize_numpunct(__c_locale __cloc);
>
>
>
>  template<typename _CharT>
>    class numpunct_byname : public numpunct<_CharT>
>    {
>    public:
>      typedef _CharT char_type;
>      typedef basic_string<_CharT> string_type;
>
>      explicit
>      numpunct_byname(const char* __s, size_t __refs = 0)
>      : numpunct<_CharT>(__refs)
>      {
> if (__builtin_strcmp(__s, "C") != 0
>     && __builtin_strcmp(__s, "POSIX") != 0)
>   {
>     __c_locale __tmp;
>     this->_S_create_c_locale(__tmp, __s);
>     this->_M_initialize_numpunct(__tmp);
>     this->_S_destroy_c_locale(__tmp);
>   }
>      }
>
>
>      explicit
>      numpunct_byname(const string& __s, size_t __refs = 0)
>      : numpunct_byname(__s.c_str(), __refs) { }
>
>
>    protected:
>      virtual
>      ~numpunct_byname() { }
>    };
>
>}
>
>
># 1947 "/usr/include/c++/8/bits/locale_facets.h" 3
>  template<typename _CharT, typename _InIter>
>    class num_get : public locale::facet
>    {
>    public:
>
>
>
>      typedef _CharT char_type;
>      typedef _InIter iter_type;
>
>
>
>      static locale::id id;
># 1968 "/usr/include/c++/8/bits/locale_facets.h" 3
>      explicit
>      num_get(size_t __refs = 0) : facet(__refs) { }
># 1994 "/usr/include/c++/8/bits/locale_facets.h" 3
>      iter_type
>      get(iter_type __in, iter_type __end, ios_base& __io,
>   ios_base::iostate& __err, bool& __v) const
>      { return this->do_get(__in, __end, __io, __err, __v); }
># 2031 "/usr/include/c++/8/bits/locale_facets.h" 3
>      iter_type
>      get(iter_type __in, iter_type __end, ios_base& __io,
>   ios_base::iostate& __err, long& __v) const
>      { return this->do_get(__in, __end, __io, __err, __v); }
>
>      iter_type
>      get(iter_type __in, iter_type __end, ios_base& __io,
>   ios_base::iostate& __err, unsigned short& __v) const
>      { return this->do_get(__in, __end, __io, __err, __v); }
>
>      iter_type
>      get(iter_type __in, iter_type __end, ios_base& __io,
>   ios_base::iostate& __err, unsigned int& __v) const
>      { return this->do_get(__in, __end, __io, __err, __v); }
>
>      iter_type
>      get(iter_type __in, iter_type __end, ios_base& __io,
>   ios_base::iostate& __err, unsigned long& __v) const
>      { return this->do_get(__in, __end, __io, __err, __v); }
>
>
>      iter_type
>      get(iter_type __in, iter_type __end, ios_base& __io,
>   ios_base::iostate& __err, long long& __v) const
>      { return this->do_get(__in, __end, __io, __err, __v); }
>
>      iter_type
>      get(iter_type __in, iter_type __end, ios_base& __io,
>   ios_base::iostate& __err, unsigned long long& __v) const
>      { return this->do_get(__in, __end, __io, __err, __v); }
># 2091 "/usr/include/c++/8/bits/locale_facets.h" 3
>      iter_type
>      get(iter_type __in, iter_type __end, ios_base& __io,
>   ios_base::iostate& __err, float& __v) const
>      { return this->do_get(__in, __end, __io, __err, __v); }
>
>      iter_type
>      get(iter_type __in, iter_type __end, ios_base& __io,
>   ios_base::iostate& __err, double& __v) const
>      { return this->do_get(__in, __end, __io, __err, __v); }
>
>      iter_type
>      get(iter_type __in, iter_type __end, ios_base& __io,
>   ios_base::iostate& __err, long double& __v) const
>      { return this->do_get(__in, __end, __io, __err, __v); }
># 2134 "/usr/include/c++/8/bits/locale_facets.h" 3
>      iter_type
>      get(iter_type __in, iter_type __end, ios_base& __io,
>   ios_base::iostate& __err, void*& __v) const
>      { return this->do_get(__in, __end, __io, __err, __v); }
>
>    protected:
>
>      virtual ~num_get() { }
>
>      __attribute ((__abi_tag__ ("cxx11")))
>      iter_type
>      _M_extract_float(iter_type, iter_type, ios_base&, ios_base::iostate&,
>         string&) const;
>
>      template<typename _ValueT>
> __attribute ((__abi_tag__ ("cxx11")))
> iter_type
> _M_extract_int(iter_type, iter_type, ios_base&, ios_base::iostate&,
>         _ValueT&) const;
>
>      template<typename _CharT2>
>      typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, int>::__type
> _M_find(const _CharT2*, size_t __len, _CharT2 __c) const
> {
>   int __ret = -1;
>   if (__len <= 10)
>     {
>       if (__c >= _CharT2('0') && __c < _CharT2(_CharT2('0') + __len))
>  __ret = __c - _CharT2('0');
>     }
>   else
>     {
>       if (__c >= _CharT2('0') && __c <= _CharT2('9'))
>  __ret = __c - _CharT2('0');
>       else if (__c >= _CharT2('a') && __c <= _CharT2('f'))
>  __ret = 10 + (__c - _CharT2('a'));
>       else if (__c >= _CharT2('A') && __c <= _CharT2('F'))
>  __ret = 10 + (__c - _CharT2('A'));
>     }
>   return __ret;
> }
>
>      template<typename _CharT2>
>      typename __gnu_cxx::__enable_if<!__is_char<_CharT2>::__value,
>          int>::__type
> _M_find(const _CharT2* __zero, size_t __len, _CharT2 __c) const
> {
>   int __ret = -1;
>   const char_type* __q = char_traits<_CharT2>::find(__zero, __len, __c);
>   if (__q)
>     {
>       __ret = __q - __zero;
>       if (__ret > 15)
>  __ret -= 6;
>     }
>   return __ret;
> }
># 2207 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual iter_type
>      do_get(iter_type, iter_type, ios_base&, ios_base::iostate&, bool&) const;
>
>      virtual iter_type
>      do_get(iter_type __beg, iter_type __end, ios_base& __io,
>      ios_base::iostate& __err, long& __v) const
>      { return _M_extract_int(__beg, __end, __io, __err, __v); }
>
>      virtual iter_type
>      do_get(iter_type __beg, iter_type __end, ios_base& __io,
>      ios_base::iostate& __err, unsigned short& __v) const
>      { return _M_extract_int(__beg, __end, __io, __err, __v); }
>
>      virtual iter_type
>      do_get(iter_type __beg, iter_type __end, ios_base& __io,
>      ios_base::iostate& __err, unsigned int& __v) const
>      { return _M_extract_int(__beg, __end, __io, __err, __v); }
>
>      virtual iter_type
>      do_get(iter_type __beg, iter_type __end, ios_base& __io,
>      ios_base::iostate& __err, unsigned long& __v) const
>      { return _M_extract_int(__beg, __end, __io, __err, __v); }
>
>
>      virtual iter_type
>      do_get(iter_type __beg, iter_type __end, ios_base& __io,
>      ios_base::iostate& __err, long long& __v) const
>      { return _M_extract_int(__beg, __end, __io, __err, __v); }
>
>      virtual iter_type
>      do_get(iter_type __beg, iter_type __end, ios_base& __io,
>      ios_base::iostate& __err, unsigned long long& __v) const
>      { return _M_extract_int(__beg, __end, __io, __err, __v); }
>
>
>      virtual iter_type
>      do_get(iter_type, iter_type, ios_base&, ios_base::iostate&, float&) const;
>
>      virtual iter_type
>      do_get(iter_type, iter_type, ios_base&, ios_base::iostate&,
>      double&) const;
>
>
>
>
>
>
>
>      virtual iter_type
>      do_get(iter_type, iter_type, ios_base&, ios_base::iostate&,
>      long double&) const;
>
>
>      virtual iter_type
>      do_get(iter_type, iter_type, ios_base&, ios_base::iostate&, void*&) const;
># 2270 "/usr/include/c++/8/bits/locale_facets.h" 3
>    };
>
>  template<typename _CharT, typename _InIter>
>    locale::id num_get<_CharT, _InIter>::id;
># 2288 "/usr/include/c++/8/bits/locale_facets.h" 3
>  template<typename _CharT, typename _OutIter>
>    class num_put : public locale::facet
>    {
>    public:
>
>
>
>      typedef _CharT char_type;
>      typedef _OutIter iter_type;
>
>
>
>      static locale::id id;
># 2309 "/usr/include/c++/8/bits/locale_facets.h" 3
>      explicit
>      num_put(size_t __refs = 0) : facet(__refs) { }
># 2327 "/usr/include/c++/8/bits/locale_facets.h" 3
>      iter_type
>      put(iter_type __s, ios_base& __io, char_type __fill, bool __v) const
>      { return this->do_put(__s, __io, __fill, __v); }
># 2369 "/usr/include/c++/8/bits/locale_facets.h" 3
>      iter_type
>      put(iter_type __s, ios_base& __io, char_type __fill, long __v) const
>      { return this->do_put(__s, __io, __fill, __v); }
>
>      iter_type
>      put(iter_type __s, ios_base& __io, char_type __fill,
>   unsigned long __v) const
>      { return this->do_put(__s, __io, __fill, __v); }
>
>
>      iter_type
>      put(iter_type __s, ios_base& __io, char_type __fill, long long __v) const
>      { return this->do_put(__s, __io, __fill, __v); }
>
>      iter_type
>      put(iter_type __s, ios_base& __io, char_type __fill,
>   unsigned long long __v) const
>      { return this->do_put(__s, __io, __fill, __v); }
># 2432 "/usr/include/c++/8/bits/locale_facets.h" 3
>      iter_type
>      put(iter_type __s, ios_base& __io, char_type __fill, double __v) const
>      { return this->do_put(__s, __io, __fill, __v); }
>
>      iter_type
>      put(iter_type __s, ios_base& __io, char_type __fill,
>   long double __v) const
>      { return this->do_put(__s, __io, __fill, __v); }
># 2457 "/usr/include/c++/8/bits/locale_facets.h" 3
>      iter_type
>      put(iter_type __s, ios_base& __io, char_type __fill,
>   const void* __v) const
>      { return this->do_put(__s, __io, __fill, __v); }
>
>    protected:
>      template<typename _ValueT>
> iter_type
> _M_insert_float(iter_type, ios_base& __io, char_type __fill,
>   char __mod, _ValueT __v) const;
>
>      void
>      _M_group_float(const char* __grouping, size_t __grouping_size,
>       char_type __sep, const char_type* __p, char_type* __new,
>       char_type* __cs, int& __len) const;
>
>      template<typename _ValueT>
> iter_type
> _M_insert_int(iter_type, ios_base& __io, char_type __fill,
>        _ValueT __v) const;
>
>      void
>      _M_group_int(const char* __grouping, size_t __grouping_size,
>     char_type __sep, ios_base& __io, char_type* __new,
>     char_type* __cs, int& __len) const;
>
>      void
>      _M_pad(char_type __fill, streamsize __w, ios_base& __io,
>      char_type* __new, const char_type* __cs, int& __len) const;
>
>
>      virtual
>      ~num_put() { }
># 2505 "/usr/include/c++/8/bits/locale_facets.h" 3
>      virtual iter_type
>      do_put(iter_type __s, ios_base& __io, char_type __fill, bool __v) const;
>
>      virtual iter_type
>      do_put(iter_type __s, ios_base& __io, char_type __fill, long __v) const
>      { return _M_insert_int(__s, __io, __fill, __v); }
>
>      virtual iter_type
>      do_put(iter_type __s, ios_base& __io, char_type __fill,
>      unsigned long __v) const
>      { return _M_insert_int(__s, __io, __fill, __v); }
>
>
>      virtual iter_type
>      do_put(iter_type __s, ios_base& __io, char_type __fill,
>      long long __v) const
>      { return _M_insert_int(__s, __io, __fill, __v); }
>
>      virtual iter_type
>      do_put(iter_type __s, ios_base& __io, char_type __fill,
>      unsigned long long __v) const
>      { return _M_insert_int(__s, __io, __fill, __v); }
>
>
>      virtual iter_type
>      do_put(iter_type, ios_base&, char_type, double) const;
>
>
>
>
>
>
>      virtual iter_type
>      do_put(iter_type, ios_base&, char_type, long double) const;
>
>
>      virtual iter_type
>      do_put(iter_type, ios_base&, char_type, const void*) const;
>
>
>
>
>
>
>
>    };
>
>  template <typename _CharT, typename _OutIter>
>    locale::id num_put<_CharT, _OutIter>::id;
>
>
>
>
>
>
>
>
>
>  template<typename _CharT>
>    inline bool
>    isspace(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).is(ctype_base::space, __c); }
>
>
>  template<typename _CharT>
>    inline bool
>    isprint(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).is(ctype_base::print, __c); }
>
>
>  template<typename _CharT>
>    inline bool
>    iscntrl(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).is(ctype_base::cntrl, __c); }
>
>
>  template<typename _CharT>
>    inline bool
>    isupper(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).is(ctype_base::upper, __c); }
>
>
>  template<typename _CharT>
>    inline bool
>    islower(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).is(ctype_base::lower, __c); }
>
>
>  template<typename _CharT>
>    inline bool
>    isalpha(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).is(ctype_base::alpha, __c); }
>
>
>  template<typename _CharT>
>    inline bool
>    isdigit(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).is(ctype_base::digit, __c); }
>
>
>  template<typename _CharT>
>    inline bool
>    ispunct(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).is(ctype_base::punct, __c); }
>
>
>  template<typename _CharT>
>    inline bool
>    isxdigit(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).is(ctype_base::xdigit, __c); }
>
>
>  template<typename _CharT>
>    inline bool
>    isalnum(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).is(ctype_base::alnum, __c); }
>
>
>  template<typename _CharT>
>    inline bool
>    isgraph(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).is(ctype_base::graph, __c); }
>
>
>
>  template<typename _CharT>
>    inline bool
>    isblank(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).is(ctype_base::blank, __c); }
>
>
>
>  template<typename _CharT>
>    inline _CharT
>    toupper(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).toupper(__c); }
>
>
>  template<typename _CharT>
>    inline _CharT
>    tolower(_CharT __c, const locale& __loc)
>    { return use_facet<ctype<_CharT> >(__loc).tolower(__c); }
>
>
>}
>
># 1 "/usr/include/c++/8/bits/locale_facets.tcc" 1 3
># 33 "/usr/include/c++/8/bits/locale_facets.tcc" 3
>       
># 34 "/usr/include/c++/8/bits/locale_facets.tcc" 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>
>  template<typename _Facet>
>    struct __use_cache
>    {
>      const _Facet*
>      operator() (const locale& __loc) const;
>    };
>
>
>  template<typename _CharT>
>    struct __use_cache<__numpunct_cache<_CharT> >
>    {
>      const __numpunct_cache<_CharT>*
>      operator() (const locale& __loc) const
>      {
> const size_t __i = numpunct<_CharT>::id._M_id();
> const locale::facet** __caches = __loc._M_impl->_M_caches;
> if (!__caches[__i])
>   {
>     __numpunct_cache<_CharT>* __tmp = 0;
>     try
>       {
>  __tmp = new __numpunct_cache<_CharT>;
>  __tmp->_M_cache(__loc);
>       }
>     catch(...)
>       {
>  delete __tmp;
>  throw;
>       }
>     __loc._M_impl->_M_install_cache(__tmp, __i);
>   }
> return static_cast<const __numpunct_cache<_CharT>*>(__caches[__i]);
>      }
>    };
>
>  template<typename _CharT>
>    void
>    __numpunct_cache<_CharT>::_M_cache(const locale& __loc)
>    {
>      const numpunct<_CharT>& __np = use_facet<numpunct<_CharT> >(__loc);
>
>      char* __grouping = 0;
>      _CharT* __truename = 0;
>      _CharT* __falsename = 0;
>      try
> {
>   const string& __g = __np.grouping();
>   _M_grouping_size = __g.size();
>   __grouping = new char[_M_grouping_size];
>   __g.copy(__grouping, _M_grouping_size);
>   _M_use_grouping = (_M_grouping_size
>        && static_cast<signed char>(__grouping[0]) > 0
>        && (__grouping[0]
>     != __gnu_cxx::__numeric_traits<char>::__max));
>
>   const basic_string<_CharT>& __tn = __np.truename();
>   _M_truename_size = __tn.size();
>   __truename = new _CharT[_M_truename_size];
>   __tn.copy(__truename, _M_truename_size);
>
>   const basic_string<_CharT>& __fn = __np.falsename();
>   _M_falsename_size = __fn.size();
>   __falsename = new _CharT[_M_falsename_size];
>   __fn.copy(__falsename, _M_falsename_size);
>
>   _M_decimal_point = __np.decimal_point();
>   _M_thousands_sep = __np.thousands_sep();
>
>   const ctype<_CharT>& __ct = use_facet<ctype<_CharT> >(__loc);
>   __ct.widen(__num_base::_S_atoms_out,
>       __num_base::_S_atoms_out
>       + __num_base::_S_oend, _M_atoms_out);
>   __ct.widen(__num_base::_S_atoms_in,
>       __num_base::_S_atoms_in
>       + __num_base::_S_iend, _M_atoms_in);
>
>   _M_grouping = __grouping;
>   _M_truename = __truename;
>   _M_falsename = __falsename;
>   _M_allocated = true;
> }
>      catch(...)
> {
>   delete [] __grouping;
>   delete [] __truename;
>   delete [] __falsename;
>   throw;
> }
>    }
># 139 "/usr/include/c++/8/bits/locale_facets.tcc" 3
>  __attribute__ ((__pure__)) bool
>  __verify_grouping(const char* __grouping, size_t __grouping_size,
>      const string& __grouping_tmp) throw ();
>
>
>
>  template<typename _CharT, typename _InIter>
>    __attribute ((__abi_tag__ ("cxx11")))
>    _InIter
>    num_get<_CharT, _InIter>::
>    _M_extract_float(_InIter __beg, _InIter __end, ios_base& __io,
>       ios_base::iostate& __err, string& __xtrc) const
>    {
>      typedef char_traits<_CharT> __traits_type;
>      typedef __numpunct_cache<_CharT> __cache_type;
>      __use_cache<__cache_type> __uc;
>      const locale& __loc = __io._M_getloc();
>      const __cache_type* __lc = __uc(__loc);
>      const _CharT* __lit = __lc->_M_atoms_in;
>      char_type __c = char_type();
>
>
>      bool __testeof = __beg == __end;
>
>
>      if (!__testeof)
> {
>   __c = *__beg;
>   const bool __plus = __c == __lit[__num_base::_S_iplus];
>   if ((__plus || __c == __lit[__num_base::_S_iminus])
>       && !(__lc->_M_use_grouping && __c == __lc->_M_thousands_sep)
>       && !(__c == __lc->_M_decimal_point))
>     {
>       __xtrc += __plus ? '+' : '-';
>       if (++__beg != __end)
>  __c = *__beg;
>       else
>  __testeof = true;
>     }
> }
>
>
>      bool __found_mantissa = false;
>      int __sep_pos = 0;
>      while (!__testeof)
> {
>   if ((__lc->_M_use_grouping && __c == __lc->_M_thousands_sep)
>       || __c == __lc->_M_decimal_point)
>     break;
>   else if (__c == __lit[__num_base::_S_izero])
>     {
>       if (!__found_mantissa)
>  {
>    __xtrc += '0';
>    __found_mantissa = true;
>  }
>       ++__sep_pos;
>
>       if (++__beg != __end)
>  __c = *__beg;
>       else
>  __testeof = true;
>     }
>   else
>     break;
> }
>
>
>      bool __found_dec = false;
>      bool __found_sci = false;
>      string __found_grouping;
>      if (__lc->_M_use_grouping)
> __found_grouping.reserve(32);
>      const char_type* __lit_zero = __lit + __num_base::_S_izero;
>
>      if (!__lc->_M_allocated)
>
> while (!__testeof)
>   {
>     const int __digit = _M_find(__lit_zero, 10, __c);
>     if (__digit != -1)
>       {
>  __xtrc += '0' + __digit;
>  __found_mantissa = true;
>       }
>     else if (__c == __lc->_M_decimal_point
>       && !__found_dec && !__found_sci)
>       {
>  __xtrc += '.';
>  __found_dec = true;
>       }
>     else if ((__c == __lit[__num_base::_S_ie]
>        || __c == __lit[__num_base::_S_iE])
>       && !__found_sci && __found_mantissa)
>       {
>
>  __xtrc += 'e';
>  __found_sci = true;
>
>
>  if (++__beg != __end)
>    {
>      __c = *__beg;
>      const bool __plus = __c == __lit[__num_base::_S_iplus];
>      if (__plus || __c == __lit[__num_base::_S_iminus])
>        __xtrc += __plus ? '+' : '-';
>      else
>        continue;
>    }
>  else
>    {
>      __testeof = true;
>      break;
>    }
>       }
>     else
>       break;
>
>     if (++__beg != __end)
>       __c = *__beg;
>     else
>       __testeof = true;
>   }
>      else
> while (!__testeof)
>   {
>
>
>     if (__lc->_M_use_grouping && __c == __lc->_M_thousands_sep)
>       {
>  if (!__found_dec && !__found_sci)
>    {
>
>
>      if (__sep_pos)
>        {
>   __found_grouping += static_cast<char>(__sep_pos);
>   __sep_pos = 0;
>        }
>      else
>        {
>
>
>   __xtrc.clear();
>   break;
>        }
>    }
>  else
>    break;
>       }
>     else if (__c == __lc->_M_decimal_point)
>       {
>  if (!__found_dec && !__found_sci)
>    {
>
>
>
>      if (__found_grouping.size())
>        __found_grouping += static_cast<char>(__sep_pos);
>      __xtrc += '.';
>      __found_dec = true;
>    }
>  else
>    break;
>       }
>     else
>       {
>  const char_type* __q =
>    __traits_type::find(__lit_zero, 10, __c);
>  if (__q)
>    {
>      __xtrc += '0' + (__q - __lit_zero);
>      __found_mantissa = true;
>      ++__sep_pos;
>    }
>  else if ((__c == __lit[__num_base::_S_ie]
>     || __c == __lit[__num_base::_S_iE])
>    && !__found_sci && __found_mantissa)
>    {
>
>      if (__found_grouping.size() && !__found_dec)
>        __found_grouping += static_cast<char>(__sep_pos);
>      __xtrc += 'e';
>      __found_sci = true;
>
>
>      if (++__beg != __end)
>        {
>   __c = *__beg;
>   const bool __plus = __c == __lit[__num_base::_S_iplus];
>   if ((__plus || __c == __lit[__num_base::_S_iminus])
>       && !(__lc->_M_use_grouping
>     && __c == __lc->_M_thousands_sep)
>       && !(__c == __lc->_M_decimal_point))
>        __xtrc += __plus ? '+' : '-';
>   else
>     continue;
>        }
>      else
>        {
>   __testeof = true;
>   break;
>        }
>    }
>  else
>    break;
>       }
>
>     if (++__beg != __end)
>       __c = *__beg;
>     else
>       __testeof = true;
>   }
>
>
>
>      if (__found_grouping.size())
>        {
>
>   if (!__found_dec && !__found_sci)
>     __found_grouping += static_cast<char>(__sep_pos);
>
>          if (!std::__verify_grouping(__lc->_M_grouping,
>          __lc->_M_grouping_size,
>          __found_grouping))
>     __err = ios_base::failbit;
>        }
>
>      return __beg;
>    }
>
>  template<typename _CharT, typename _InIter>
>    template<typename _ValueT>
>      __attribute ((__abi_tag__ ("cxx11")))
>      _InIter
>      num_get<_CharT, _InIter>::
>      _M_extract_int(_InIter __beg, _InIter __end, ios_base& __io,
>       ios_base::iostate& __err, _ValueT& __v) const
>      {
>        typedef char_traits<_CharT> __traits_type;
> using __gnu_cxx::__add_unsigned;
> typedef typename __add_unsigned<_ValueT>::__type __unsigned_type;
> typedef __numpunct_cache<_CharT> __cache_type;
> __use_cache<__cache_type> __uc;
> const locale& __loc = __io._M_getloc();
> const __cache_type* __lc = __uc(__loc);
> const _CharT* __lit = __lc->_M_atoms_in;
> char_type __c = char_type();
>
>
> const ios_base::fmtflags __basefield = __io.flags()
>                                        & ios_base::basefield;
> const bool __oct = __basefield == ios_base::oct;
> int __base = __oct ? 8 : (__basefield == ios_base::hex ? 16 : 10);
>
>
> bool __testeof = __beg == __end;
>
>
> bool __negative = false;
> if (!__testeof)
>   {
>     __c = *__beg;
>     __negative = __c == __lit[__num_base::_S_iminus];
>     if ((__negative || __c == __lit[__num_base::_S_iplus])
>  && !(__lc->_M_use_grouping && __c == __lc->_M_thousands_sep)
>  && !(__c == __lc->_M_decimal_point))
>       {
>  if (++__beg != __end)
>    __c = *__beg;
>  else
>    __testeof = true;
>       }
>   }
>
>
>
> bool __found_zero = false;
> int __sep_pos = 0;
> while (!__testeof)
>   {
>     if ((__lc->_M_use_grouping && __c == __lc->_M_thousands_sep)
>  || __c == __lc->_M_decimal_point)
>       break;
>     else if (__c == __lit[__num_base::_S_izero]
>       && (!__found_zero || __base == 10))
>       {
>  __found_zero = true;
>  ++__sep_pos;
>  if (__basefield == 0)
>    __base = 8;
>  if (__base == 8)
>    __sep_pos = 0;
>       }
>     else if (__found_zero
>       && (__c == __lit[__num_base::_S_ix]
>    || __c == __lit[__num_base::_S_iX]))
>       {
>  if (__basefield == 0)
>    __base = 16;
>  if (__base == 16)
>    {
>      __found_zero = false;
>      __sep_pos = 0;
>    }
>  else
>    break;
>       }
>     else
>       break;
>
>     if (++__beg != __end)
>       {
>  __c = *__beg;
>  if (!__found_zero)
>    break;
>       }
>     else
>       __testeof = true;
>   }
>
>
>
> const size_t __len = (__base == 16 ? __num_base::_S_iend
>         - __num_base::_S_izero : __base);
>
>
> typedef __gnu_cxx::__numeric_traits<_ValueT> __num_traits;
> string __found_grouping;
> if (__lc->_M_use_grouping)
>   __found_grouping.reserve(32);
> bool __testfail = false;
> bool __testoverflow = false;
> const __unsigned_type __max =
>   (__negative && __num_traits::__is_signed)
>   ? -static_cast<__unsigned_type>(__num_traits::__min)
>   : __num_traits::__max;
> const __unsigned_type __smax = __max / __base;
> __unsigned_type __result = 0;
> int __digit = 0;
> const char_type* __lit_zero = __lit + __num_base::_S_izero;
>
> if (!__lc->_M_allocated)
>
>   while (!__testeof)
>     {
>       __digit = _M_find(__lit_zero, __len, __c);
>       if (__digit == -1)
>  break;
>
>       if (__result > __smax)
>  __testoverflow = true;
>       else
>  {
>    __result *= __base;
>    __testoverflow |= __result > __max - __digit;
>    __result += __digit;
>    ++__sep_pos;
>  }
>
>       if (++__beg != __end)
>  __c = *__beg;
>       else
>  __testeof = true;
>     }
> else
>   while (!__testeof)
>     {
>
>
>       if (__lc->_M_use_grouping && __c == __lc->_M_thousands_sep)
>  {
>
>
>    if (__sep_pos)
>      {
>        __found_grouping += static_cast<char>(__sep_pos);
>        __sep_pos = 0;
>      }
>    else
>      {
>        __testfail = true;
>        break;
>      }
>  }
>       else if (__c == __lc->_M_decimal_point)
>  break;
>       else
>  {
>    const char_type* __q =
>      __traits_type::find(__lit_zero, __len, __c);
>    if (!__q)
>      break;
>
>    __digit = __q - __lit_zero;
>    if (__digit > 15)
>      __digit -= 6;
>    if (__result > __smax)
>      __testoverflow = true;
>    else
>      {
>        __result *= __base;
>        __testoverflow |= __result > __max - __digit;
>        __result += __digit;
>        ++__sep_pos;
>      }
>  }
>
>       if (++__beg != __end)
>  __c = *__beg;
>       else
>  __testeof = true;
>     }
>
>
>
> if (__found_grouping.size())
>   {
>
>     __found_grouping += static_cast<char>(__sep_pos);
>
>     if (!std::__verify_grouping(__lc->_M_grouping,
>     __lc->_M_grouping_size,
>     __found_grouping))
>       __err = ios_base::failbit;
>   }
>
>
>
> if ((!__sep_pos && !__found_zero && !__found_grouping.size())
>     || __testfail)
>   {
>     __v = 0;
>     __err = ios_base::failbit;
>   }
> else if (__testoverflow)
>   {
>     if (__negative && __num_traits::__is_signed)
>       __v = __num_traits::__min;
>     else
>       __v = __num_traits::__max;
>     __err = ios_base::failbit;
>   }
> else
>   __v = __negative ? -__result : __result;
>
> if (__testeof)
>   __err |= ios_base::eofbit;
> return __beg;
>      }
>
>
>
>  template<typename _CharT, typename _InIter>
>    _InIter
>    num_get<_CharT, _InIter>::
>    do_get(iter_type __beg, iter_type __end, ios_base& __io,
>           ios_base::iostate& __err, bool& __v) const
>    {
>      if (!(__io.flags() & ios_base::boolalpha))
>        {
>
>
>
>   long __l = -1;
>          __beg = _M_extract_int(__beg, __end, __io, __err, __l);
>   if (__l == 0 || __l == 1)
>     __v = bool(__l);
>   else
>     {
>
>
>       __v = true;
>       __err = ios_base::failbit;
>       if (__beg == __end)
>  __err |= ios_base::eofbit;
>     }
>        }
>      else
>        {
>
>   typedef __numpunct_cache<_CharT> __cache_type;
>   __use_cache<__cache_type> __uc;
>   const locale& __loc = __io._M_getloc();
>   const __cache_type* __lc = __uc(__loc);
>
>   bool __testf = true;
>   bool __testt = true;
>   bool __donef = __lc->_M_falsename_size == 0;
>   bool __donet = __lc->_M_truename_size == 0;
>   bool __testeof = false;
>   size_t __n = 0;
>   while (!__donef || !__donet)
>     {
>       if (__beg == __end)
>  {
>    __testeof = true;
>    break;
>  }
>
>       const char_type __c = *__beg;
>
>       if (!__donef)
>  __testf = __c == __lc->_M_falsename[__n];
>
>       if (!__testf && __donet)
>  break;
>
>       if (!__donet)
>  __testt = __c == __lc->_M_truename[__n];
>
>       if (!__testt && __donef)
>  break;
>
>       if (!__testt && !__testf)
>  break;
>
>       ++__n;
>       ++__beg;
>
>       __donef = !__testf || __n >= __lc->_M_falsename_size;
>       __donet = !__testt || __n >= __lc->_M_truename_size;
>     }
>   if (__testf && __n == __lc->_M_falsename_size && __n)
>     {
>       __v = false;
>       if (__testt && __n == __lc->_M_truename_size)
>  __err = ios_base::failbit;
>       else
>  __err = __testeof ? ios_base::eofbit : ios_base::goodbit;
>     }
>   else if (__testt && __n == __lc->_M_truename_size && __n)
>     {
>       __v = true;
>       __err = __testeof ? ios_base::eofbit : ios_base::goodbit;
>     }
>   else
>     {
>
>
>       __v = false;
>       __err = ios_base::failbit;
>       if (__testeof)
>  __err |= ios_base::eofbit;
>     }
> }
>      return __beg;
>    }
>
>  template<typename _CharT, typename _InIter>
>    _InIter
>    num_get<_CharT, _InIter>::
>    do_get(iter_type __beg, iter_type __end, ios_base& __io,
>    ios_base::iostate& __err, float& __v) const
>    {
>      string __xtrc;
>      __xtrc.reserve(32);
>      __beg = _M_extract_float(__beg, __end, __io, __err, __xtrc);
>      std::__convert_to_v(__xtrc.c_str(), __v, __err, _S_get_c_locale());
>      if (__beg == __end)
> __err |= ios_base::eofbit;
>      return __beg;
>    }
>
>  template<typename _CharT, typename _InIter>
>    _InIter
>    num_get<_CharT, _InIter>::
>    do_get(iter_type __beg, iter_type __end, ios_base& __io,
>           ios_base::iostate& __err, double& __v) const
>    {
>      string __xtrc;
>      __xtrc.reserve(32);
>      __beg = _M_extract_float(__beg, __end, __io, __err, __xtrc);
>      std::__convert_to_v(__xtrc.c_str(), __v, __err, _S_get_c_locale());
>      if (__beg == __end)
> __err |= ios_base::eofbit;
>      return __beg;
>    }
># 735 "/usr/include/c++/8/bits/locale_facets.tcc" 3
>  template<typename _CharT, typename _InIter>
>    _InIter
>    num_get<_CharT, _InIter>::
>    do_get(iter_type __beg, iter_type __end, ios_base& __io,
>           ios_base::iostate& __err, long double& __v) const
>    {
>      string __xtrc;
>      __xtrc.reserve(32);
>      __beg = _M_extract_float(__beg, __end, __io, __err, __xtrc);
>      std::__convert_to_v(__xtrc.c_str(), __v, __err, _S_get_c_locale());
>      if (__beg == __end)
> __err |= ios_base::eofbit;
>      return __beg;
>    }
>
>  template<typename _CharT, typename _InIter>
>    _InIter
>    num_get<_CharT, _InIter>::
>    do_get(iter_type __beg, iter_type __end, ios_base& __io,
>           ios_base::iostate& __err, void*& __v) const
>    {
>
>      typedef ios_base::fmtflags fmtflags;
>      const fmtflags __fmt = __io.flags();
>      __io.flags((__fmt & ~ios_base::basefield) | ios_base::hex);
>
>      typedef __gnu_cxx::__conditional_type<(sizeof(void*)
>          <= sizeof(unsigned long)),
> unsigned long, unsigned long long>::__type _UIntPtrType;
>
>      _UIntPtrType __ul;
>      __beg = _M_extract_int(__beg, __end, __io, __err, __ul);
>
>
>      __io.flags(__fmt);
>
>      __v = reinterpret_cast<void*>(__ul);
>      return __beg;
>    }
>
>
>
>  template<typename _CharT, typename _OutIter>
>    void
>    num_put<_CharT, _OutIter>::
>    _M_pad(_CharT __fill, streamsize __w, ios_base& __io,
>    _CharT* __new, const _CharT* __cs, int& __len) const
>    {
>
>
>      __pad<_CharT, char_traits<_CharT> >::_S_pad(__io, __fill, __new,
>        __cs, __w, __len);
>      __len = static_cast<int>(__w);
>    }
>
>
>
>  template<typename _CharT, typename _ValueT>
>    int
>    __int_to_char(_CharT* __bufend, _ValueT __v, const _CharT* __lit,
>    ios_base::fmtflags __flags, bool __dec)
>    {
>      _CharT* __buf = __bufend;
>      if (__builtin_expect(__dec, true))
> {
>
>   do
>     {
>       *--__buf = __lit[(__v % 10) + __num_base::_S_odigits];
>       __v /= 10;
>     }
>   while (__v != 0);
> }
>      else if ((__flags & ios_base::basefield) == ios_base::oct)
> {
>
>   do
>     {
>       *--__buf = __lit[(__v & 0x7) + __num_base::_S_odigits];
>       __v >>= 3;
>     }
>   while (__v != 0);
> }
>      else
> {
>
>   const bool __uppercase = __flags & ios_base::uppercase;
>   const int __case_offset = __uppercase ? __num_base::_S_oudigits
>                                         : __num_base::_S_odigits;
>   do
>     {
>       *--__buf = __lit[(__v & 0xf) + __case_offset];
>       __v >>= 4;
>     }
>   while (__v != 0);
> }
>      return __bufend - __buf;
>    }
>
>
>
>  template<typename _CharT, typename _OutIter>
>    void
>    num_put<_CharT, _OutIter>::
>    _M_group_int(const char* __grouping, size_t __grouping_size, _CharT __sep,
>   ios_base&, _CharT* __new, _CharT* __cs, int& __len) const
>    {
>      _CharT* __p = std::__add_grouping(__new, __sep, __grouping,
>     __grouping_size, __cs, __cs + __len);
>      __len = __p - __new;
>    }
>
>  template<typename _CharT, typename _OutIter>
>    template<typename _ValueT>
>      _OutIter
>      num_put<_CharT, _OutIter>::
>      _M_insert_int(_OutIter __s, ios_base& __io, _CharT __fill,
>      _ValueT __v) const
>      {
> using __gnu_cxx::__add_unsigned;
> typedef typename __add_unsigned<_ValueT>::__type __unsigned_type;
> typedef __numpunct_cache<_CharT> __cache_type;
> __use_cache<__cache_type> __uc;
> const locale& __loc = __io._M_getloc();
> const __cache_type* __lc = __uc(__loc);
> const _CharT* __lit = __lc->_M_atoms_out;
> const ios_base::fmtflags __flags = __io.flags();
>
>
> const int __ilen = 5 * sizeof(_ValueT);
> _CharT* __cs = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
>            * __ilen));
>
>
>
> const ios_base::fmtflags __basefield = __flags & ios_base::basefield;
> const bool __dec = (__basefield != ios_base::oct
>       && __basefield != ios_base::hex);
> const __unsigned_type __u = ((__v > 0 || !__dec)
>         ? __unsigned_type(__v)
>         : -__unsigned_type(__v));
>  int __len = __int_to_char(__cs + __ilen, __u, __lit, __flags, __dec);
> __cs += __ilen - __len;
>
>
> if (__lc->_M_use_grouping)
>   {
>
>
>     _CharT* __cs2 = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
>          * (__len + 1)
>          * 2));
>     _M_group_int(__lc->_M_grouping, __lc->_M_grouping_size,
>    __lc->_M_thousands_sep, __io, __cs2 + 2, __cs, __len);
>     __cs = __cs2 + 2;
>   }
>
>
> if (__builtin_expect(__dec, true))
>   {
>
>     if (__v >= 0)
>       {
>  if (bool(__flags & ios_base::showpos)
>      && __gnu_cxx::__numeric_traits<_ValueT>::__is_signed)
>    *--__cs = __lit[__num_base::_S_oplus], ++__len;
>       }
>     else
>       *--__cs = __lit[__num_base::_S_ominus], ++__len;
>   }
> else if (bool(__flags & ios_base::showbase) && __v)
>   {
>     if (__basefield == ios_base::oct)
>       *--__cs = __lit[__num_base::_S_odigits], ++__len;
>     else
>       {
>
>  const bool __uppercase = __flags & ios_base::uppercase;
>  *--__cs = __lit[__num_base::_S_ox + __uppercase];
>
>  *--__cs = __lit[__num_base::_S_odigits];
>  __len += 2;
>       }
>   }
>
>
> const streamsize __w = __io.width();
> if (__w > static_cast<streamsize>(__len))
>   {
>     _CharT* __cs3 = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
>          * __w));
>     _M_pad(__fill, __w, __io, __cs3, __cs, __len);
>     __cs = __cs3;
>   }
> __io.width(0);
>
>
>
> return std::__write(__s, __cs, __len);
>      }
>
>  template<typename _CharT, typename _OutIter>
>    void
>    num_put<_CharT, _OutIter>::
>    _M_group_float(const char* __grouping, size_t __grouping_size,
>     _CharT __sep, const _CharT* __p, _CharT* __new,
>     _CharT* __cs, int& __len) const
>    {
>
>
>
>      const int __declen = __p ? __p - __cs : __len;
>      _CharT* __p2 = std::__add_grouping(__new, __sep, __grouping,
>      __grouping_size,
>      __cs, __cs + __declen);
>
>
>      int __newlen = __p2 - __new;
>      if (__p)
> {
>   char_traits<_CharT>::copy(__p2, __p, __len - __declen);
>   __newlen += __len - __declen;
> }
>      __len = __newlen;
>    }
># 971 "/usr/include/c++/8/bits/locale_facets.tcc" 3
>  template<typename _CharT, typename _OutIter>
>    template<typename _ValueT>
>      _OutIter
>      num_put<_CharT, _OutIter>::
>      _M_insert_float(_OutIter __s, ios_base& __io, _CharT __fill, char __mod,
>         _ValueT __v) const
>      {
> typedef __numpunct_cache<_CharT> __cache_type;
> __use_cache<__cache_type> __uc;
> const locale& __loc = __io._M_getloc();
> const __cache_type* __lc = __uc(__loc);
>
>
> const streamsize __prec = __io.precision() < 0 ? 6 : __io.precision();
>
> const int __max_digits =
>   __gnu_cxx::__numeric_traits<_ValueT>::__digits10;
>
>
> int __len;
>
> char __fbuf[16];
> __num_base::_S_format_float(__io, __fbuf, __mod);
>
>
>
> const bool __use_prec =
>   (__io.flags() & ios_base::floatfield) != ios_base::floatfield;
>
>
>
> int __cs_size = __max_digits * 3;
> char* __cs = static_cast<char*>(__builtin_alloca(__cs_size));
> if (__use_prec)
>   __len = std::__convert_from_v(_S_get_c_locale(), __cs, __cs_size,
>     __fbuf, __prec, __v);
> else
>   __len = std::__convert_from_v(_S_get_c_locale(), __cs, __cs_size,
>     __fbuf, __v);
>
>
> if (__len >= __cs_size)
>   {
>     __cs_size = __len + 1;
>     __cs = static_cast<char*>(__builtin_alloca(__cs_size));
>     if (__use_prec)
>       __len = std::__convert_from_v(_S_get_c_locale(), __cs, __cs_size,
>         __fbuf, __prec, __v);
>     else
>       __len = std::__convert_from_v(_S_get_c_locale(), __cs, __cs_size,
>         __fbuf, __v);
>   }
># 1044 "/usr/include/c++/8/bits/locale_facets.tcc" 3
> const ctype<_CharT>& __ctype = use_facet<ctype<_CharT> >(__loc);
>
> _CharT* __ws = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
>            * __len));
> __ctype.widen(__cs, __cs + __len, __ws);
>
>
> _CharT* __wp = 0;
> const char* __p = char_traits<char>::find(__cs, __len, '.');
> if (__p)
>   {
>     __wp = __ws + (__p - __cs);
>     *__wp = __lc->_M_decimal_point;
>   }
>
>
>
>
> if (__lc->_M_use_grouping
>     && (__wp || __len < 3 || (__cs[1] <= '9' && __cs[2] <= '9'
>          && __cs[1] >= '0' && __cs[2] >= '0')))
>   {
>
>
>     _CharT* __ws2 = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
>          * __len * 2));
>
>     streamsize __off = 0;
>     if (__cs[0] == '-' || __cs[0] == '+')
>       {
>  __off = 1;
>  __ws2[0] = __ws[0];
>  __len -= 1;
>       }
>
>     _M_group_float(__lc->_M_grouping, __lc->_M_grouping_size,
>      __lc->_M_thousands_sep, __wp, __ws2 + __off,
>      __ws + __off, __len);
>     __len += __off;
>
>     __ws = __ws2;
>   }
>
>
> const streamsize __w = __io.width();
> if (__w > static_cast<streamsize>(__len))
>   {
>     _CharT* __ws3 = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
>          * __w));
>     _M_pad(__fill, __w, __io, __ws3, __ws, __len);
>     __ws = __ws3;
>   }
> __io.width(0);
>
>
>
> return std::__write(__s, __ws, __len);
>      }
>
>  template<typename _CharT, typename _OutIter>
>    _OutIter
>    num_put<_CharT, _OutIter>::
>    do_put(iter_type __s, ios_base& __io, char_type __fill, bool __v) const
>    {
>      const ios_base::fmtflags __flags = __io.flags();
>      if ((__flags & ios_base::boolalpha) == 0)
>        {
>          const long __l = __v;
>          __s = _M_insert_int(__s, __io, __fill, __l);
>        }
>      else
>        {
>   typedef __numpunct_cache<_CharT> __cache_type;
>   __use_cache<__cache_type> __uc;
>   const locale& __loc = __io._M_getloc();
>   const __cache_type* __lc = __uc(__loc);
>
>   const _CharT* __name = __v ? __lc->_M_truename
>                              : __lc->_M_falsename;
>   int __len = __v ? __lc->_M_truename_size
>                   : __lc->_M_falsename_size;
>
>   const streamsize __w = __io.width();
>   if (__w > static_cast<streamsize>(__len))
>     {
>       const streamsize __plen = __w - __len;
>       _CharT* __ps
>  = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
>       * __plen));
>
>       char_traits<_CharT>::assign(__ps, __plen, __fill);
>       __io.width(0);
>
>       if ((__flags & ios_base::adjustfield) == ios_base::left)
>  {
>    __s = std::__write(__s, __name, __len);
>    __s = std::__write(__s, __ps, __plen);
>  }
>       else
>  {
>    __s = std::__write(__s, __ps, __plen);
>    __s = std::__write(__s, __name, __len);
>  }
>       return __s;
>     }
>   __io.width(0);
>   __s = std::__write(__s, __name, __len);
> }
>      return __s;
>    }
>
>  template<typename _CharT, typename _OutIter>
>    _OutIter
>    num_put<_CharT, _OutIter>::
>    do_put(iter_type __s, ios_base& __io, char_type __fill, double __v) const
>    { return _M_insert_float(__s, __io, __fill, char(), __v); }
># 1169 "/usr/include/c++/8/bits/locale_facets.tcc" 3
>  template<typename _CharT, typename _OutIter>
>    _OutIter
>    num_put<_CharT, _OutIter>::
>    do_put(iter_type __s, ios_base& __io, char_type __fill,
>    long double __v) const
>    { return _M_insert_float(__s, __io, __fill, 'L', __v); }
>
>  template<typename _CharT, typename _OutIter>
>    _OutIter
>    num_put<_CharT, _OutIter>::
>    do_put(iter_type __s, ios_base& __io, char_type __fill,
>           const void* __v) const
>    {
>      const ios_base::fmtflags __flags = __io.flags();
>      const ios_base::fmtflags __fmt = ~(ios_base::basefield
>      | ios_base::uppercase);
>      __io.flags((__flags & __fmt) | (ios_base::hex | ios_base::showbase));
>
>      typedef __gnu_cxx::__conditional_type<(sizeof(const void*)
>          <= sizeof(unsigned long)),
> unsigned long, unsigned long long>::__type _UIntPtrType;
>
>      __s = _M_insert_int(__s, __io, __fill,
>     reinterpret_cast<_UIntPtrType>(__v));
>      __io.flags(__flags);
>      return __s;
>    }
>
>
># 1206 "/usr/include/c++/8/bits/locale_facets.tcc" 3
>  template<typename _CharT, typename _Traits>
>    void
>    __pad<_CharT, _Traits>::_S_pad(ios_base& __io, _CharT __fill,
>       _CharT* __news, const _CharT* __olds,
>       streamsize __newlen, streamsize __oldlen)
>    {
>      const size_t __plen = static_cast<size_t>(__newlen - __oldlen);
>      const ios_base::fmtflags __adjust = __io.flags() & ios_base::adjustfield;
>
>
>      if (__adjust == ios_base::left)
> {
>   _Traits::copy(__news, __olds, __oldlen);
>   _Traits::assign(__news + __oldlen, __plen, __fill);
>   return;
> }
>
>      size_t __mod = 0;
>      if (__adjust == ios_base::internal)
> {
>
>
>
>          const locale& __loc = __io._M_getloc();
>   const ctype<_CharT>& __ctype = use_facet<ctype<_CharT> >(__loc);
>
>   if (__ctype.widen('-') == __olds[0]
>       || __ctype.widen('+') == __olds[0])
>     {
>       __news[0] = __olds[0];
>       __mod = 1;
>       ++__news;
>     }
>   else if (__ctype.widen('0') == __olds[0]
>     && __oldlen > 1
>     && (__ctype.widen('x') == __olds[1]
>         || __ctype.widen('X') == __olds[1]))
>     {
>       __news[0] = __olds[0];
>       __news[1] = __olds[1];
>       __mod = 2;
>       __news += 2;
>     }
>
> }
>      _Traits::assign(__news, __plen, __fill);
>      _Traits::copy(__news + __plen, __olds + __mod, __oldlen - __mod);
>    }
>
>  template<typename _CharT>
>    _CharT*
>    __add_grouping(_CharT* __s, _CharT __sep,
>     const char* __gbeg, size_t __gsize,
>     const _CharT* __first, const _CharT* __last)
>    {
>      size_t __idx = 0;
>      size_t __ctr = 0;
>
>      while (__last - __first > __gbeg[__idx]
>      && static_cast<signed char>(__gbeg[__idx]) > 0
>      && __gbeg[__idx] != __gnu_cxx::__numeric_traits<char>::__max)
> {
>   __last -= __gbeg[__idx];
>   __idx < __gsize - 1 ? ++__idx : ++__ctr;
> }
>
>      while (__first != __last)
> *__s++ = *__first++;
>
>      while (__ctr--)
> {
>   *__s++ = __sep;
>   for (char __i = __gbeg[__idx]; __i > 0; --__i)
>     *__s++ = *__first++;
> }
>
>      while (__idx--)
> {
>   *__s++ = __sep;
>   for (char __i = __gbeg[__idx]; __i > 0; --__i)
>     *__s++ = *__first++;
> }
>
>      return __s;
>    }
>
>
>
>
>  extern template class __cxx11:: numpunct<char>;
>  extern template class __cxx11:: numpunct_byname<char>;
>  extern template class num_get<char>;
>  extern template class num_put<char>;
>  extern template class ctype_byname<char>;
>
>  extern template
>    const ctype<char>&
>    use_facet<ctype<char> >(const locale&);
>
>  extern template
>    const numpunct<char>&
>    use_facet<numpunct<char> >(const locale&);
>
>  extern template
>    const num_put<char>&
>    use_facet<num_put<char> >(const locale&);
>
>  extern template
>    const num_get<char>&
>    use_facet<num_get<char> >(const locale&);
>
>  extern template
>    bool
>    has_facet<ctype<char> >(const locale&);
>
>  extern template
>    bool
>    has_facet<numpunct<char> >(const locale&);
>
>  extern template
>    bool
>    has_facet<num_put<char> >(const locale&);
>
>  extern template
>    bool
>    has_facet<num_get<char> >(const locale&);
>
>
>  extern template class __cxx11:: numpunct<wchar_t>;
>  extern template class __cxx11:: numpunct_byname<wchar_t>;
>  extern template class num_get<wchar_t>;
>  extern template class num_put<wchar_t>;
>  extern template class ctype_byname<wchar_t>;
>
>  extern template
>    const ctype<wchar_t>&
>    use_facet<ctype<wchar_t> >(const locale&);
>
>  extern template
>    const numpunct<wchar_t>&
>    use_facet<numpunct<wchar_t> >(const locale&);
>
>  extern template
>    const num_put<wchar_t>&
>    use_facet<num_put<wchar_t> >(const locale&);
>
>  extern template
>    const num_get<wchar_t>&
>    use_facet<num_get<wchar_t> >(const locale&);
>
> extern template
>    bool
>    has_facet<ctype<wchar_t> >(const locale&);
>
>  extern template
>    bool
>    has_facet<numpunct<wchar_t> >(const locale&);
>
>  extern template
>    bool
>    has_facet<num_put<wchar_t> >(const locale&);
>
>  extern template
>    bool
>    has_facet<num_get<wchar_t> >(const locale&);
>
>
>
>
>}
># 2652 "/usr/include/c++/8/bits/locale_facets.h" 2 3
># 38 "/usr/include/c++/8/bits/basic_ios.h" 2 3
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  template<typename _Facet>
>    inline const _Facet&
>    __check_facet(const _Facet* __f)
>    {
>      if (!__f)
> __throw_bad_cast();
>      return *__f;
>    }
># 66 "/usr/include/c++/8/bits/basic_ios.h" 3
>  template<typename _CharT, typename _Traits>
>    class basic_ios : public ios_base
>    {
>    public:
>
>
>
>
>
>
>      typedef _CharT char_type;
>      typedef typename _Traits::int_type int_type;
>      typedef typename _Traits::pos_type pos_type;
>      typedef typename _Traits::off_type off_type;
>      typedef _Traits traits_type;
>
>
>
>
>
>
>      typedef ctype<_CharT> __ctype_type;
>      typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> >
>           __num_put_type;
>      typedef num_get<_CharT, istreambuf_iterator<_CharT, _Traits> >
>           __num_get_type;
>
>
>
>    protected:
>      basic_ostream<_CharT, _Traits>* _M_tie;
>      mutable char_type _M_fill;
>      mutable bool _M_fill_init;
>      basic_streambuf<_CharT, _Traits>* _M_streambuf;
>
>
>      const __ctype_type* _M_ctype;
>
>      const __num_put_type* _M_num_put;
>
>      const __num_get_type* _M_num_get;
>
>    public:
># 117 "/usr/include/c++/8/bits/basic_ios.h" 3
>      explicit operator bool() const
>      { return !this->fail(); }
>
>
>
>
>
>      bool
>      operator!() const
>      { return this->fail(); }
># 136 "/usr/include/c++/8/bits/basic_ios.h" 3
>      iostate
>      rdstate() const
>      { return _M_streambuf_state; }
># 147 "/usr/include/c++/8/bits/basic_ios.h" 3
>      void
>      clear(iostate __state = goodbit);
>
>
>
>
>
>
>
>      void
>      setstate(iostate __state)
>      { this->clear(this->rdstate() | __state); }
>
>
>
>
>      void
>      _M_setstate(iostate __state)
>      {
>
>
> _M_streambuf_state |= __state;
> if (this->exceptions() & __state)
>   throw;
>      }
>
>
>
>
>
>
>
>      bool
>      good() const
>      { return this->rdstate() == 0; }
>
>
>
>
>
>
>
>      bool
>      eof() const
>      { return (this->rdstate() & eofbit) != 0; }
># 200 "/usr/include/c++/8/bits/basic_ios.h" 3
>      bool
>      fail() const
>      { return (this->rdstate() & (badbit | failbit)) != 0; }
>
>
>
>
>
>
>
>      bool
>      bad() const
>      { return (this->rdstate() & badbit) != 0; }
># 221 "/usr/include/c++/8/bits/basic_ios.h" 3
>      iostate
>      exceptions() const
>      { return _M_exception; }
># 256 "/usr/include/c++/8/bits/basic_ios.h" 3
>      void
>      exceptions(iostate __except)
>      {
>        _M_exception = __except;
>        this->clear(_M_streambuf_state);
>      }
>
>
>
>
>
>
>
>      explicit
>      basic_ios(basic_streambuf<_CharT, _Traits>* __sb)
>      : ios_base(), _M_tie(0), _M_fill(), _M_fill_init(false), _M_streambuf(0),
> _M_ctype(0), _M_num_put(0), _M_num_get(0)
>      { this->init(__sb); }
>
>
>
>
>
>
>
>      virtual
>      ~basic_ios() { }
># 294 "/usr/include/c++/8/bits/basic_ios.h" 3
>      basic_ostream<_CharT, _Traits>*
>      tie() const
>      { return _M_tie; }
># 306 "/usr/include/c++/8/bits/basic_ios.h" 3
>      basic_ostream<_CharT, _Traits>*
>      tie(basic_ostream<_CharT, _Traits>* __tiestr)
>      {
>        basic_ostream<_CharT, _Traits>* __old = _M_tie;
>        _M_tie = __tiestr;
>        return __old;
>      }
>
>
>
>
>
>
>
>      basic_streambuf<_CharT, _Traits>*
>      rdbuf() const
>      { return _M_streambuf; }
># 346 "/usr/include/c++/8/bits/basic_ios.h" 3
>      basic_streambuf<_CharT, _Traits>*
>      rdbuf(basic_streambuf<_CharT, _Traits>* __sb);
># 360 "/usr/include/c++/8/bits/basic_ios.h" 3
>      basic_ios&
>      copyfmt(const basic_ios& __rhs);
>
>
>
>
>
>
>
>      char_type
>      fill() const
>      {
> if (!_M_fill_init)
>   {
>     _M_fill = this->widen(' ');
>     _M_fill_init = true;
>   }
> return _M_fill;
>      }
># 389 "/usr/include/c++/8/bits/basic_ios.h" 3
>      char_type
>      fill(char_type __ch)
>      {
> char_type __old = this->fill();
> _M_fill = __ch;
> return __old;
>      }
># 409 "/usr/include/c++/8/bits/basic_ios.h" 3
>      locale
>      imbue(const locale& __loc);
># 429 "/usr/include/c++/8/bits/basic_ios.h" 3
>      char
>      narrow(char_type __c, char __dfault) const
>      { return __check_facet(_M_ctype).narrow(__c, __dfault); }
># 448 "/usr/include/c++/8/bits/basic_ios.h" 3
>      char_type
>      widen(char __c) const
>      { return __check_facet(_M_ctype).widen(__c); }
>
>    protected:
>
>
>
>
>
>
>
>      basic_ios()
>      : ios_base(), _M_tie(0), _M_fill(char_type()), _M_fill_init(false),
> _M_streambuf(0), _M_ctype(0), _M_num_put(0), _M_num_get(0)
>      { }
>
>
>
>
>
>
>
>      void
>      init(basic_streambuf<_CharT, _Traits>* __sb);
>
>
>      basic_ios(const basic_ios&) = delete;
>      basic_ios& operator=(const basic_ios&) = delete;
>
>      void
>      move(basic_ios& __rhs)
>      {
> ios_base::_M_move(__rhs);
> _M_cache_locale(_M_ios_locale);
> this->tie(__rhs.tie(nullptr));
> _M_fill = __rhs._M_fill;
> _M_fill_init = __rhs._M_fill_init;
> _M_streambuf = nullptr;
>      }
>
>      void
>      move(basic_ios&& __rhs)
>      { this->move(__rhs); }
>
>      void
>      swap(basic_ios& __rhs) noexcept
>      {
> ios_base::_M_swap(__rhs);
> _M_cache_locale(_M_ios_locale);
> __rhs._M_cache_locale(__rhs._M_ios_locale);
> std::swap(_M_tie, __rhs._M_tie);
> std::swap(_M_fill, __rhs._M_fill);
> std::swap(_M_fill_init, __rhs._M_fill_init);
>      }
>
>      void
>      set_rdbuf(basic_streambuf<_CharT, _Traits>* __sb)
>      { _M_streambuf = __sb; }
>
>
>      void
>      _M_cache_locale(const locale& __loc);
>    };
>
>
>}
>
># 1 "/usr/include/c++/8/bits/basic_ios.tcc" 1 3
># 33 "/usr/include/c++/8/bits/basic_ios.tcc" 3
>       
># 34 "/usr/include/c++/8/bits/basic_ios.tcc" 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  template<typename _CharT, typename _Traits>
>    void
>    basic_ios<_CharT, _Traits>::clear(iostate __state)
>    {
>      if (this->rdbuf())
> _M_streambuf_state = __state;
>      else
>   _M_streambuf_state = __state | badbit;
>      if (this->exceptions() & this->rdstate())
> __throw_ios_failure(("basic_ios::clear"));
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_streambuf<_CharT, _Traits>*
>    basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb)
>    {
>      basic_streambuf<_CharT, _Traits>* __old = _M_streambuf;
>      _M_streambuf = __sb;
>      this->clear();
>      return __old;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_ios<_CharT, _Traits>&
>    basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs)
>    {
>
>
>      if (this != &__rhs)
> {
>
>
>
>
>   _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ?
>                      _M_local_word : new _Words[__rhs._M_word_size];
>
>
>   _Callback_list* __cb = __rhs._M_callbacks;
>   if (__cb)
>     __cb->_M_add_reference();
>   _M_call_callbacks(erase_event);
>   if (_M_word != _M_local_word)
>     {
>       delete [] _M_word;
>       _M_word = 0;
>     }
>   _M_dispose_callbacks();
>
>
>   _M_callbacks = __cb;
>   for (int __i = 0; __i < __rhs._M_word_size; ++__i)
>     __words[__i] = __rhs._M_word[__i];
>   _M_word = __words;
>   _M_word_size = __rhs._M_word_size;
>
>   this->flags(__rhs.flags());
>   this->width(__rhs.width());
>   this->precision(__rhs.precision());
>   this->tie(__rhs.tie());
>   this->fill(__rhs.fill());
>   _M_ios_locale = __rhs.getloc();
>   _M_cache_locale(_M_ios_locale);
>
>   _M_call_callbacks(copyfmt_event);
>
>
>   this->exceptions(__rhs.exceptions());
> }
>      return *this;
>    }
>
>
>  template<typename _CharT, typename _Traits>
>    locale
>    basic_ios<_CharT, _Traits>::imbue(const locale& __loc)
>    {
>      locale __old(this->getloc());
>      ios_base::imbue(__loc);
>      _M_cache_locale(__loc);
>      if (this->rdbuf() != 0)
> this->rdbuf()->pubimbue(__loc);
>      return __old;
>    }
>
>  template<typename _CharT, typename _Traits>
>    void
>    basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb)
>    {
>
>      ios_base::_M_init();
>
>
>      _M_cache_locale(_M_ios_locale);
># 146 "/usr/include/c++/8/bits/basic_ios.tcc" 3
>      _M_fill = _CharT();
>      _M_fill_init = false;
>
>      _M_tie = 0;
>      _M_exception = goodbit;
>      _M_streambuf = __sb;
>      _M_streambuf_state = __sb ? goodbit : badbit;
>    }
>
>  template<typename _CharT, typename _Traits>
>    void
>    basic_ios<_CharT, _Traits>::_M_cache_locale(const locale& __loc)
>    {
>      if (__builtin_expect(has_facet<__ctype_type>(__loc), true))
> _M_ctype = std::__addressof(use_facet<__ctype_type>(__loc));
>      else
> _M_ctype = 0;
>
>      if (__builtin_expect(has_facet<__num_put_type>(__loc), true))
> _M_num_put = std::__addressof(use_facet<__num_put_type>(__loc));
>      else
> _M_num_put = 0;
>
>      if (__builtin_expect(has_facet<__num_get_type>(__loc), true))
> _M_num_get = std::__addressof(use_facet<__num_get_type>(__loc));
>      else
> _M_num_get = 0;
>    }
>
>
>
>
>  extern template class basic_ios<char>;
>
>
>  extern template class basic_ios<wchar_t>;
>
>
>
>
>}
># 517 "/usr/include/c++/8/bits/basic_ios.h" 2 3
># 45 "/usr/include/c++/8/ios" 2 3
># 39 "/usr/include/c++/8/istream" 2 3
># 1 "/usr/include/c++/8/ostream" 1 3
># 36 "/usr/include/c++/8/ostream" 3
>       
># 37 "/usr/include/c++/8/ostream" 3
>
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 57 "/usr/include/c++/8/ostream" 3
>  template<typename _CharT, typename _Traits>
>    class basic_ostream : virtual public basic_ios<_CharT, _Traits>
>    {
>    public:
>
>      typedef _CharT char_type;
>      typedef typename _Traits::int_type int_type;
>      typedef typename _Traits::pos_type pos_type;
>      typedef typename _Traits::off_type off_type;
>      typedef _Traits traits_type;
>
>
>      typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
>      typedef basic_ios<_CharT, _Traits> __ios_type;
>      typedef basic_ostream<_CharT, _Traits> __ostream_type;
>      typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> >
>             __num_put_type;
>      typedef ctype<_CharT> __ctype_type;
># 83 "/usr/include/c++/8/ostream" 3
>      explicit
>      basic_ostream(__streambuf_type* __sb)
>      { this->init(__sb); }
>
>
>
>
>
>
>      virtual
>      ~basic_ostream() { }
>
>
>      class sentry;
>      friend class sentry;
># 107 "/usr/include/c++/8/ostream" 3
>      __ostream_type&
>      operator<<(__ostream_type& (*__pf)(__ostream_type&))
>      {
>
>
>
> return __pf(*this);
>      }
>
>      __ostream_type&
>      operator<<(__ios_type& (*__pf)(__ios_type&))
>      {
>
>
>
> __pf(*this);
> return *this;
>      }
>
>      __ostream_type&
>      operator<<(ios_base& (*__pf) (ios_base&))
>      {
>
>
>
> __pf(*this);
> return *this;
>      }
># 165 "/usr/include/c++/8/ostream" 3
>      __ostream_type&
>      operator<<(long __n)
>      { return _M_insert(__n); }
>
>      __ostream_type&
>      operator<<(unsigned long __n)
>      { return _M_insert(__n); }
>
>      __ostream_type&
>      operator<<(bool __n)
>      { return _M_insert(__n); }
>
>      __ostream_type&
>      operator<<(short __n);
>
>      __ostream_type&
>      operator<<(unsigned short __n)
>      {
>
>
> return _M_insert(static_cast<unsigned long>(__n));
>      }
>
>      __ostream_type&
>      operator<<(int __n);
>
>      __ostream_type&
>      operator<<(unsigned int __n)
>      {
>
>
> return _M_insert(static_cast<unsigned long>(__n));
>      }
>
>
>      __ostream_type&
>      operator<<(long long __n)
>      { return _M_insert(__n); }
>
>      __ostream_type&
>      operator<<(unsigned long long __n)
>      { return _M_insert(__n); }
># 219 "/usr/include/c++/8/ostream" 3
>      __ostream_type&
>      operator<<(double __f)
>      { return _M_insert(__f); }
>
>      __ostream_type&
>      operator<<(float __f)
>      {
>
>
> return _M_insert(static_cast<double>(__f));
>      }
>
>      __ostream_type&
>      operator<<(long double __f)
>      { return _M_insert(__f); }
># 244 "/usr/include/c++/8/ostream" 3
>      __ostream_type&
>      operator<<(const void* __p)
>      { return _M_insert(__p); }
># 269 "/usr/include/c++/8/ostream" 3
>      __ostream_type&
>      operator<<(__streambuf_type* __sb);
># 302 "/usr/include/c++/8/ostream" 3
>      __ostream_type&
>      put(char_type __c);
>
>
>
>
>
>
>      void
>      _M_write(const char_type* __s, streamsize __n)
>      {
> const streamsize __put = this->rdbuf()->sputn(__s, __n);
> if (__put != __n)
>   this->setstate(ios_base::badbit);
>      }
># 334 "/usr/include/c++/8/ostream" 3
>      __ostream_type&
>      write(const char_type* __s, streamsize __n);
># 347 "/usr/include/c++/8/ostream" 3
>      __ostream_type&
>      flush();
># 357 "/usr/include/c++/8/ostream" 3
>      pos_type
>      tellp();
># 368 "/usr/include/c++/8/ostream" 3
>      __ostream_type&
>      seekp(pos_type);
># 380 "/usr/include/c++/8/ostream" 3
>       __ostream_type&
>      seekp(off_type, ios_base::seekdir);
>
>    protected:
>      basic_ostream()
>      { this->init(0); }
>
>
>
>      basic_ostream(basic_iostream<_CharT, _Traits>&) { }
>
>      basic_ostream(const basic_ostream&) = delete;
>
>      basic_ostream(basic_ostream&& __rhs)
>      : __ios_type()
>      { __ios_type::move(__rhs); }
>
>
>
>      basic_ostream& operator=(const basic_ostream&) = delete;
>
>      basic_ostream&
>      operator=(basic_ostream&& __rhs)
>      {
> swap(__rhs);
> return *this;
>      }
>
>      void
>      swap(basic_ostream& __rhs)
>      { __ios_type::swap(__rhs); }
>
>
>      template<typename _ValueT>
> __ostream_type&
> _M_insert(_ValueT __v);
>    };
># 425 "/usr/include/c++/8/ostream" 3
>  template <typename _CharT, typename _Traits>
>    class basic_ostream<_CharT, _Traits>::sentry
>    {
>
>      bool _M_ok;
>      basic_ostream<_CharT, _Traits>& _M_os;
>
>    public:
># 444 "/usr/include/c++/8/ostream" 3
>      explicit
>      sentry(basic_ostream<_CharT, _Traits>& __os);
># 454 "/usr/include/c++/8/ostream" 3
>      ~sentry()
>      {
>
> if (bool(_M_os.flags() & ios_base::unitbuf) && !uncaught_exception())
>   {
>
>     if (_M_os.rdbuf() && _M_os.rdbuf()->pubsync() == -1)
>       _M_os.setstate(ios_base::badbit);
>   }
>      }
># 473 "/usr/include/c++/8/ostream" 3
>      explicit
>
>      operator bool() const
>      { return _M_ok; }
>    };
># 495 "/usr/include/c++/8/ostream" 3
>  template<typename _CharT, typename _Traits>
>    inline basic_ostream<_CharT, _Traits>&
>    operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
>    { return __ostream_insert(__out, &__c, 1); }
>
>  template<typename _CharT, typename _Traits>
>    inline basic_ostream<_CharT, _Traits>&
>    operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
>    { return (__out << __out.widen(__c)); }
>
>
>  template <class _Traits>
>    inline basic_ostream<char, _Traits>&
>    operator<<(basic_ostream<char, _Traits>& __out, char __c)
>    { return __ostream_insert(__out, &__c, 1); }
>
>
>  template<class _Traits>
>    inline basic_ostream<char, _Traits>&
>    operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
>    { return (__out << static_cast<char>(__c)); }
>
>  template<class _Traits>
>    inline basic_ostream<char, _Traits>&
>    operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
>    { return (__out << static_cast<char>(__c)); }
># 537 "/usr/include/c++/8/ostream" 3
>  template<typename _CharT, typename _Traits>
>    inline basic_ostream<_CharT, _Traits>&
>    operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
>    {
>      if (!__s)
> __out.setstate(ios_base::badbit);
>      else
> __ostream_insert(__out, __s,
>    static_cast<streamsize>(_Traits::length(__s)));
>      return __out;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits> &
>    operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s);
>
>
>  template<class _Traits>
>    inline basic_ostream<char, _Traits>&
>    operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
>    {
>      if (!__s)
> __out.setstate(ios_base::badbit);
>      else
> __ostream_insert(__out, __s,
>    static_cast<streamsize>(_Traits::length(__s)));
>      return __out;
>    }
>
>
>  template<class _Traits>
>    inline basic_ostream<char, _Traits>&
>    operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
>    { return (__out << reinterpret_cast<const char*>(__s)); }
>
>  template<class _Traits>
>    inline basic_ostream<char, _Traits> &
>    operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
>    { return (__out << reinterpret_cast<const char*>(__s)); }
># 588 "/usr/include/c++/8/ostream" 3
>  template<typename _CharT, typename _Traits>
>    inline basic_ostream<_CharT, _Traits>&
>    endl(basic_ostream<_CharT, _Traits>& __os)
>    { return flush(__os.put(__os.widen('\n'))); }
># 600 "/usr/include/c++/8/ostream" 3
>  template<typename _CharT, typename _Traits>
>    inline basic_ostream<_CharT, _Traits>&
>    ends(basic_ostream<_CharT, _Traits>& __os)
>    { return __os.put(_CharT()); }
>
>
>
>
>
>
>  template<typename _CharT, typename _Traits>
>    inline basic_ostream<_CharT, _Traits>&
>    flush(basic_ostream<_CharT, _Traits>& __os)
>    { return __os.flush(); }
>
>
>  template<typename _Ch, typename _Up>
>    basic_ostream<_Ch, _Up>&
>    __is_convertible_to_basic_ostream_test(basic_ostream<_Ch, _Up>*);
>
>  template<typename _Tp, typename = void>
>    struct __is_convertible_to_basic_ostream_impl
>    {
>      using __ostream_type = void;
>    };
>
>  template<typename _Tp>
>    using __do_is_convertible_to_basic_ostream_impl =
>    decltype(__is_convertible_to_basic_ostream_test
>      (declval<typename remove_reference<_Tp>::type*>()));
>
>  template<typename _Tp>
>    struct __is_convertible_to_basic_ostream_impl
>    <_Tp,
>     __void_t<__do_is_convertible_to_basic_ostream_impl<_Tp>>>
>    {
>      using __ostream_type =
> __do_is_convertible_to_basic_ostream_impl<_Tp>;
>    };
>
>  template<typename _Tp>
>    struct __is_convertible_to_basic_ostream
>    : __is_convertible_to_basic_ostream_impl<_Tp>
>    {
>    public:
>      using type = __not_<is_void<
>        typename __is_convertible_to_basic_ostream_impl<_Tp>::__ostream_type>>;
>      constexpr static bool value = type::value;
>    };
>
>  template<typename _Ostream, typename _Tp, typename = void>
>    struct __is_insertable : false_type {};
>
>  template<typename _Ostream, typename _Tp>
>    struct __is_insertable<_Ostream, _Tp,
>      __void_t<decltype(declval<_Ostream&>()
>          << declval<const _Tp&>())>>
>        : true_type {};
>
>  template<typename _Ostream>
>    using __rvalue_ostream_type =
>      typename __is_convertible_to_basic_ostream<
> _Ostream>::__ostream_type;
># 674 "/usr/include/c++/8/ostream" 3
>  template<typename _Ostream, typename _Tp>
>    inline
>    typename enable_if<__and_<__not_<is_lvalue_reference<_Ostream>>,
>         __is_convertible_to_basic_ostream<_Ostream>,
>         __is_insertable<
>    __rvalue_ostream_type<_Ostream>,
>    const _Tp&>>::value,
>         __rvalue_ostream_type<_Ostream>>::type
>    operator<<(_Ostream&& __os, const _Tp& __x)
>    {
>      __rvalue_ostream_type<_Ostream> __ret_os = __os;
>      __ret_os << __x;
>      return __ret_os;
>    }
>
>
>
>}
>
># 1 "/usr/include/c++/8/bits/ostream.tcc" 1 3
># 37 "/usr/include/c++/8/bits/ostream.tcc" 3
>       
># 38 "/usr/include/c++/8/bits/ostream.tcc" 3
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits>::sentry::
>    sentry(basic_ostream<_CharT, _Traits>& __os)
>    : _M_ok(false), _M_os(__os)
>    {
>
>      if (__os.tie() && __os.good())
> __os.tie()->flush();
>
>      if (__os.good())
> _M_ok = true;
>      else
> __os.setstate(ios_base::failbit);
>    }
>
>  template<typename _CharT, typename _Traits>
>    template<typename _ValueT>
>      basic_ostream<_CharT, _Traits>&
>      basic_ostream<_CharT, _Traits>::
>      _M_insert(_ValueT __v)
>      {
> sentry __cerb(*this);
> if (__cerb)
>   {
>     ios_base::iostate __err = ios_base::goodbit;
>     try
>       {
>  const __num_put_type& __np = __check_facet(this->_M_num_put);
>  if (__np.put(*this, *this, this->fill(), __v).failed())
>    __err |= ios_base::badbit;
>       }
>     catch(__cxxabiv1::__forced_unwind&)
>       {
>  this->_M_setstate(ios_base::badbit);
>  throw;
>       }
>     catch(...)
>       { this->_M_setstate(ios_base::badbit); }
>     if (__err)
>       this->setstate(__err);
>   }
> return *this;
>      }
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits>&
>    basic_ostream<_CharT, _Traits>::
>    operator<<(short __n)
>    {
>
>
>      const ios_base::fmtflags __fmt = this->flags() & ios_base::basefield;
>      if (__fmt == ios_base::oct || __fmt == ios_base::hex)
> return _M_insert(static_cast<long>(static_cast<unsigned short>(__n)));
>      else
> return _M_insert(static_cast<long>(__n));
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits>&
>    basic_ostream<_CharT, _Traits>::
>    operator<<(int __n)
>    {
>
>
>      const ios_base::fmtflags __fmt = this->flags() & ios_base::basefield;
>      if (__fmt == ios_base::oct || __fmt == ios_base::hex)
> return _M_insert(static_cast<long>(static_cast<unsigned int>(__n)));
>      else
> return _M_insert(static_cast<long>(__n));
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits>&
>    basic_ostream<_CharT, _Traits>::
>    operator<<(__streambuf_type* __sbin)
>    {
>      ios_base::iostate __err = ios_base::goodbit;
>      sentry __cerb(*this);
>      if (__cerb && __sbin)
> {
>   try
>     {
>       if (!__copy_streambufs(__sbin, this->rdbuf()))
>  __err |= ios_base::failbit;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::failbit); }
> }
>      else if (!__sbin)
> __err |= ios_base::badbit;
>      if (__err)
> this->setstate(__err);
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits>&
>    basic_ostream<_CharT, _Traits>::
>    put(char_type __c)
>    {
>
>
>
>
>
>
>      sentry __cerb(*this);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>       const int_type __put = this->rdbuf()->sputc(__c);
>       if (traits_type::eq_int_type(__put, traits_type::eof()))
>  __err |= ios_base::badbit;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
>   if (__err)
>     this->setstate(__err);
> }
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits>&
>    basic_ostream<_CharT, _Traits>::
>    write(const _CharT* __s, streamsize __n)
>    {
>
>
>
>
>
>
>
>      sentry __cerb(*this);
>      if (__cerb)
> {
>   try
>     { _M_write(__s, __n); }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
> }
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits>&
>    basic_ostream<_CharT, _Traits>::
>    flush()
>    {
>
>
>
>      ios_base::iostate __err = ios_base::goodbit;
>      try
> {
>   if (this->rdbuf() && this->rdbuf()->pubsync() == -1)
>     __err |= ios_base::badbit;
> }
>      catch(__cxxabiv1::__forced_unwind&)
> {
>   this->_M_setstate(ios_base::badbit);
>   throw;
> }
>      catch(...)
> { this->_M_setstate(ios_base::badbit); }
>      if (__err)
> this->setstate(__err);
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    typename basic_ostream<_CharT, _Traits>::pos_type
>    basic_ostream<_CharT, _Traits>::
>    tellp()
>    {
>      pos_type __ret = pos_type(-1);
>      try
> {
>   if (!this->fail())
>     __ret = this->rdbuf()->pubseekoff(0, ios_base::cur, ios_base::out);
> }
>      catch(__cxxabiv1::__forced_unwind&)
> {
>   this->_M_setstate(ios_base::badbit);
>   throw;
> }
>      catch(...)
> { this->_M_setstate(ios_base::badbit); }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits>&
>    basic_ostream<_CharT, _Traits>::
>    seekp(pos_type __pos)
>    {
>      ios_base::iostate __err = ios_base::goodbit;
>      try
> {
>   if (!this->fail())
>     {
>
>
>       const pos_type __p = this->rdbuf()->pubseekpos(__pos,
>            ios_base::out);
>
>
>       if (__p == pos_type(off_type(-1)))
>  __err |= ios_base::failbit;
>     }
> }
>      catch(__cxxabiv1::__forced_unwind&)
> {
>   this->_M_setstate(ios_base::badbit);
>   throw;
> }
>      catch(...)
> { this->_M_setstate(ios_base::badbit); }
>      if (__err)
> this->setstate(__err);
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits>&
>    basic_ostream<_CharT, _Traits>::
>    seekp(off_type __off, ios_base::seekdir __dir)
>    {
>      ios_base::iostate __err = ios_base::goodbit;
>      try
> {
>   if (!this->fail())
>     {
>
>
>       const pos_type __p = this->rdbuf()->pubseekoff(__off, __dir,
>            ios_base::out);
>
>
>       if (__p == pos_type(off_type(-1)))
>  __err |= ios_base::failbit;
>     }
> }
>      catch(__cxxabiv1::__forced_unwind&)
> {
>   this->_M_setstate(ios_base::badbit);
>   throw;
> }
>      catch(...)
> { this->_M_setstate(ios_base::badbit); }
>      if (__err)
> this->setstate(__err);
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_ostream<_CharT, _Traits>&
>    operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
>    {
>      if (!__s)
> __out.setstate(ios_base::badbit);
>      else
> {
>
>
>   const size_t __clen = char_traits<char>::length(__s);
>   try
>     {
>       struct __ptr_guard
>       {
>  _CharT *__p;
>  __ptr_guard (_CharT *__ip): __p(__ip) { }
>  ~__ptr_guard() { delete[] __p; }
>  _CharT* __get() { return __p; }
>       } __pg (new _CharT[__clen]);
>
>       _CharT *__ws = __pg.__get();
>       for (size_t __i = 0; __i < __clen; ++__i)
>  __ws[__i] = __out.widen(__s[__i]);
>       __ostream_insert(__out, __ws, __clen);
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       __out._M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { __out._M_setstate(ios_base::badbit); }
> }
>      return __out;
>    }
>
>
>
>
>  extern template class basic_ostream<char>;
>  extern template ostream& endl(ostream&);
>  extern template ostream& ends(ostream&);
>  extern template ostream& flush(ostream&);
>  extern template ostream& operator<<(ostream&, char);
>  extern template ostream& operator<<(ostream&, unsigned char);
>  extern template ostream& operator<<(ostream&, signed char);
>  extern template ostream& operator<<(ostream&, const char*);
>  extern template ostream& operator<<(ostream&, const unsigned char*);
>  extern template ostream& operator<<(ostream&, const signed char*);
>
>  extern template ostream& ostream::_M_insert(long);
>  extern template ostream& ostream::_M_insert(unsigned long);
>  extern template ostream& ostream::_M_insert(bool);
>
>  extern template ostream& ostream::_M_insert(long long);
>  extern template ostream& ostream::_M_insert(unsigned long long);
>
>  extern template ostream& ostream::_M_insert(double);
>  extern template ostream& ostream::_M_insert(long double);
>  extern template ostream& ostream::_M_insert(const void*);
>
>
>  extern template class basic_ostream<wchar_t>;
>  extern template wostream& endl(wostream&);
>  extern template wostream& ends(wostream&);
>  extern template wostream& flush(wostream&);
>  extern template wostream& operator<<(wostream&, wchar_t);
>  extern template wostream& operator<<(wostream&, char);
>  extern template wostream& operator<<(wostream&, const wchar_t*);
>  extern template wostream& operator<<(wostream&, const char*);
>
>  extern template wostream& wostream::_M_insert(long);
>  extern template wostream& wostream::_M_insert(unsigned long);
>  extern template wostream& wostream::_M_insert(bool);
>
>  extern template wostream& wostream::_M_insert(long long);
>  extern template wostream& wostream::_M_insert(unsigned long long);
>
>  extern template wostream& wostream::_M_insert(double);
>  extern template wostream& wostream::_M_insert(long double);
>  extern template wostream& wostream::_M_insert(const void*);
>
>
>
>
>}
># 694 "/usr/include/c++/8/ostream" 2 3
># 40 "/usr/include/c++/8/istream" 2 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 57 "/usr/include/c++/8/istream" 3
>  template<typename _CharT, typename _Traits>
>    class basic_istream : virtual public basic_ios<_CharT, _Traits>
>    {
>    public:
>
>      typedef _CharT char_type;
>      typedef typename _Traits::int_type int_type;
>      typedef typename _Traits::pos_type pos_type;
>      typedef typename _Traits::off_type off_type;
>      typedef _Traits traits_type;
>
>
>      typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
>      typedef basic_ios<_CharT, _Traits> __ios_type;
>      typedef basic_istream<_CharT, _Traits> __istream_type;
>      typedef num_get<_CharT, istreambuf_iterator<_CharT, _Traits> >
>        __num_get_type;
>      typedef ctype<_CharT> __ctype_type;
>
>    protected:
>
>
>
>
>
>      streamsize _M_gcount;
>
>    public:
>
>
>
>
>
>
>
>      explicit
>      basic_istream(__streambuf_type* __sb)
>      : _M_gcount(streamsize(0))
>      { this->init(__sb); }
>
>
>
>
>
>
>      virtual
>      ~basic_istream()
>      { _M_gcount = streamsize(0); }
>
>
>      class sentry;
>      friend class sentry;
># 119 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      operator>>(__istream_type& (*__pf)(__istream_type&))
>      { return __pf(*this); }
>
>      __istream_type&
>      operator>>(__ios_type& (*__pf)(__ios_type&))
>      {
> __pf(*this);
> return *this;
>      }
>
>      __istream_type&
>      operator>>(ios_base& (*__pf)(ios_base&))
>      {
> __pf(*this);
> return *this;
>      }
># 167 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      operator>>(bool& __n)
>      { return _M_extract(__n); }
>
>      __istream_type&
>      operator>>(short& __n);
>
>      __istream_type&
>      operator>>(unsigned short& __n)
>      { return _M_extract(__n); }
>
>      __istream_type&
>      operator>>(int& __n);
>
>      __istream_type&
>      operator>>(unsigned int& __n)
>      { return _M_extract(__n); }
>
>      __istream_type&
>      operator>>(long& __n)
>      { return _M_extract(__n); }
>
>      __istream_type&
>      operator>>(unsigned long& __n)
>      { return _M_extract(__n); }
>
>
>      __istream_type&
>      operator>>(long long& __n)
>      { return _M_extract(__n); }
>
>      __istream_type&
>      operator>>(unsigned long long& __n)
>      { return _M_extract(__n); }
># 213 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      operator>>(float& __f)
>      { return _M_extract(__f); }
>
>      __istream_type&
>      operator>>(double& __f)
>      { return _M_extract(__f); }
>
>      __istream_type&
>      operator>>(long double& __f)
>      { return _M_extract(__f); }
># 234 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      operator>>(void*& __p)
>      { return _M_extract(__p); }
># 258 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      operator>>(__streambuf_type* __sb);
># 268 "/usr/include/c++/8/istream" 3
>      streamsize
>      gcount() const
>      { return _M_gcount; }
># 301 "/usr/include/c++/8/istream" 3
>      int_type
>      get();
># 315 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      get(char_type& __c);
># 342 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      get(char_type* __s, streamsize __n, char_type __delim);
># 353 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      get(char_type* __s, streamsize __n)
>      { return this->get(__s, __n, this->widen('\n')); }
># 376 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      get(__streambuf_type& __sb, char_type __delim);
># 386 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      get(__streambuf_type& __sb)
>      { return this->get(__sb, this->widen('\n')); }
># 415 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      getline(char_type* __s, streamsize __n, char_type __delim);
># 426 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      getline(char_type* __s, streamsize __n)
>      { return this->getline(__s, __n, this->widen('\n')); }
># 450 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      ignore(streamsize __n, int_type __delim);
>
>      __istream_type&
>      ignore(streamsize __n);
>
>      __istream_type&
>      ignore();
># 467 "/usr/include/c++/8/istream" 3
>      int_type
>      peek();
># 485 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      read(char_type* __s, streamsize __n);
># 504 "/usr/include/c++/8/istream" 3
>      streamsize
>      readsome(char_type* __s, streamsize __n);
># 521 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      putback(char_type __c);
># 537 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      unget();
># 555 "/usr/include/c++/8/istream" 3
>      int
>      sync();
># 570 "/usr/include/c++/8/istream" 3
>      pos_type
>      tellg();
># 585 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      seekg(pos_type);
># 601 "/usr/include/c++/8/istream" 3
>      __istream_type&
>      seekg(off_type, ios_base::seekdir);
>
>
>    protected:
>      basic_istream()
>      : _M_gcount(streamsize(0))
>      { this->init(0); }
>
>
>      basic_istream(const basic_istream&) = delete;
>
>      basic_istream(basic_istream&& __rhs)
>      : __ios_type(), _M_gcount(__rhs._M_gcount)
>      {
> __ios_type::move(__rhs);
> __rhs._M_gcount = 0;
>      }
>
>
>
>      basic_istream& operator=(const basic_istream&) = delete;
>
>      basic_istream&
>      operator=(basic_istream&& __rhs)
>      {
> swap(__rhs);
> return *this;
>      }
>
>      void
>      swap(basic_istream& __rhs)
>      {
> __ios_type::swap(__rhs);
> std::swap(_M_gcount, __rhs._M_gcount);
>      }
>
>
>      template<typename _ValueT>
> __istream_type&
> _M_extract(_ValueT& __v);
>    };
>
>
>  template<>
>    basic_istream<char>&
>    basic_istream<char>::
>    getline(char_type* __s, streamsize __n, char_type __delim);
>
>  template<>
>    basic_istream<char>&
>    basic_istream<char>::
>    ignore(streamsize __n);
>
>  template<>
>    basic_istream<char>&
>    basic_istream<char>::
>    ignore(streamsize __n, int_type __delim);
>
>
>  template<>
>    basic_istream<wchar_t>&
>    basic_istream<wchar_t>::
>    getline(char_type* __s, streamsize __n, char_type __delim);
>
>  template<>
>    basic_istream<wchar_t>&
>    basic_istream<wchar_t>::
>    ignore(streamsize __n);
>
>  template<>
>    basic_istream<wchar_t>&
>    basic_istream<wchar_t>::
>    ignore(streamsize __n, int_type __delim);
># 685 "/usr/include/c++/8/istream" 3
>  template<typename _CharT, typename _Traits>
>    class basic_istream<_CharT, _Traits>::sentry
>    {
>
>      bool _M_ok;
>
>    public:
>
>      typedef _Traits traits_type;
>      typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
>      typedef basic_istream<_CharT, _Traits> __istream_type;
>      typedef typename __istream_type::__ctype_type __ctype_type;
>      typedef typename _Traits::int_type __int_type;
># 721 "/usr/include/c++/8/istream" 3
>      explicit
>      sentry(basic_istream<_CharT, _Traits>& __is, bool __noskipws = false);
># 732 "/usr/include/c++/8/istream" 3
>      explicit
>
>      operator bool() const
>      { return _M_ok; }
>    };
># 750 "/usr/include/c++/8/istream" 3
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c);
>
>  template<class _Traits>
>    inline basic_istream<char, _Traits>&
>    operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
>    { return (__in >> reinterpret_cast<char&>(__c)); }
>
>  template<class _Traits>
>    inline basic_istream<char, _Traits>&
>    operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
>    { return (__in >> reinterpret_cast<char&>(__c)); }
># 792 "/usr/include/c++/8/istream" 3
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s);
>
>
>  template<>
>    basic_istream<char>&
>    operator>>(basic_istream<char>& __in, char* __s);
>
>  template<class _Traits>
>    inline basic_istream<char, _Traits>&
>    operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
>    { return (__in >> reinterpret_cast<char*>(__s)); }
>
>  template<class _Traits>
>    inline basic_istream<char, _Traits>&
>    operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
>    { return (__in >> reinterpret_cast<char*>(__s)); }
># 823 "/usr/include/c++/8/istream" 3
>  template<typename _CharT, typename _Traits>
>    class basic_iostream
>    : public basic_istream<_CharT, _Traits>,
>      public basic_ostream<_CharT, _Traits>
>    {
>    public:
>
>
>
>      typedef _CharT char_type;
>      typedef typename _Traits::int_type int_type;
>      typedef typename _Traits::pos_type pos_type;
>      typedef typename _Traits::off_type off_type;
>      typedef _Traits traits_type;
>
>
>      typedef basic_istream<_CharT, _Traits> __istream_type;
>      typedef basic_ostream<_CharT, _Traits> __ostream_type;
>
>
>
>
>
>
>
>      explicit
>      basic_iostream(basic_streambuf<_CharT, _Traits>* __sb)
>      : __istream_type(__sb), __ostream_type(__sb) { }
>
>
>
>
>      virtual
>      ~basic_iostream() { }
>
>    protected:
>      basic_iostream()
>      : __istream_type(), __ostream_type() { }
>
>
>      basic_iostream(const basic_iostream&) = delete;
>
>      basic_iostream(basic_iostream&& __rhs)
>      : __istream_type(std::move(__rhs)), __ostream_type(*this)
>      { }
>
>
>
>      basic_iostream& operator=(const basic_iostream&) = delete;
>
>      basic_iostream&
>      operator=(basic_iostream&& __rhs)
>      {
> swap(__rhs);
> return *this;
>      }
>
>      void
>      swap(basic_iostream& __rhs)
>      { __istream_type::swap(__rhs); }
>
>    };
># 906 "/usr/include/c++/8/istream" 3
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    ws(basic_istream<_CharT, _Traits>& __is);
>
>
>  template<typename _Ch, typename _Up>
>    basic_istream<_Ch, _Up>&
>    __is_convertible_to_basic_istream_test(basic_istream<_Ch, _Up>*);
>
>  template<typename _Tp, typename = void>
>    struct __is_convertible_to_basic_istream_impl
>    {
>      using __istream_type = void;
>    };
>
>  template<typename _Tp>
>    using __do_is_convertible_to_basic_istream_impl =
>    decltype(__is_convertible_to_basic_istream_test
>      (declval<typename remove_reference<_Tp>::type*>()));
>
>  template<typename _Tp>
>    struct __is_convertible_to_basic_istream_impl
>    <_Tp,
>     __void_t<__do_is_convertible_to_basic_istream_impl<_Tp>>>
>    {
>      using __istream_type =
> __do_is_convertible_to_basic_istream_impl<_Tp>;
>    };
>
>  template<typename _Tp>
>    struct __is_convertible_to_basic_istream
>    : __is_convertible_to_basic_istream_impl<_Tp>
>    {
>    public:
>      using type = __not_<is_void<
>        typename __is_convertible_to_basic_istream_impl<_Tp>::__istream_type>>;
>      constexpr static bool value = type::value;
>    };
>
>  template<typename _Istream, typename _Tp, typename = void>
>    struct __is_extractable : false_type {};
>
>  template<typename _Istream, typename _Tp>
>    struct __is_extractable<_Istream, _Tp,
>       __void_t<decltype(declval<_Istream&>()
>           >> declval<_Tp>())>>
>    : true_type {};
>
>  template<typename _Istream>
>    using __rvalue_istream_type =
>      typename __is_convertible_to_basic_istream<
> _Istream>::__istream_type;
># 972 "/usr/include/c++/8/istream" 3
>  template<typename _Istream, typename _Tp>
>    inline
>    typename enable_if<__and_<__not_<is_lvalue_reference<_Istream>>,
>         __is_convertible_to_basic_istream<_Istream>,
>         __is_extractable<
>    __rvalue_istream_type<_Istream>,
>    _Tp&&>>::value,
>         __rvalue_istream_type<_Istream>>::type
>    operator>>(_Istream&& __is, _Tp&& __x)
>    {
>      __rvalue_istream_type<_Istream> __ret_is = __is;
>      __ret_is >> std::forward<_Tp>(__x);
>      return __ret_is;
>    }
>
>
>
>}
>
># 1 "/usr/include/c++/8/bits/istream.tcc" 1 3
># 37 "/usr/include/c++/8/bits/istream.tcc" 3
>       
># 38 "/usr/include/c++/8/bits/istream.tcc" 3
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>::sentry::
>    sentry(basic_istream<_CharT, _Traits>& __in, bool __noskip) : _M_ok(false)
>    {
>      ios_base::iostate __err = ios_base::goodbit;
>      if (__in.good())
> try
>   {
>     if (__in.tie())
>       __in.tie()->flush();
>     if (!__noskip && bool(__in.flags() & ios_base::skipws))
>       {
>  const __int_type __eof = traits_type::eof();
>  __streambuf_type* __sb = __in.rdbuf();
>  __int_type __c = __sb->sgetc();
>
>  const __ctype_type& __ct = __check_facet(__in._M_ctype);
>  while (!traits_type::eq_int_type(__c, __eof)
>         && __ct.is(ctype_base::space,
>      traits_type::to_char_type(__c)))
>    __c = __sb->snextc();
>
>
>
>
>  if (traits_type::eq_int_type(__c, __eof))
>    __err |= ios_base::eofbit;
>       }
>   }
> catch(__cxxabiv1::__forced_unwind&)
>   {
>     __in._M_setstate(ios_base::badbit);
>     throw;
>   }
> catch(...)
>   { __in._M_setstate(ios_base::badbit); }
>
>      if (__in.good() && __err == ios_base::goodbit)
> _M_ok = true;
>      else
> {
>   __err |= ios_base::failbit;
>   __in.setstate(__err);
> }
>    }
>
>  template<typename _CharT, typename _Traits>
>    template<typename _ValueT>
>      basic_istream<_CharT, _Traits>&
>      basic_istream<_CharT, _Traits>::
>      _M_extract(_ValueT& __v)
>      {
> sentry __cerb(*this, false);
> if (__cerb)
>   {
>     ios_base::iostate __err = ios_base::goodbit;
>     try
>       {
>  const __num_get_type& __ng = __check_facet(this->_M_num_get);
>  __ng.get(*this, 0, *this, __err, __v);
>       }
>     catch(__cxxabiv1::__forced_unwind&)
>       {
>  this->_M_setstate(ios_base::badbit);
>  throw;
>       }
>     catch(...)
>       { this->_M_setstate(ios_base::badbit); }
>     if (__err)
>       this->setstate(__err);
>   }
> return *this;
>      }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    operator>>(short& __n)
>    {
>
>
>      sentry __cerb(*this, false);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>       long __l;
>       const __num_get_type& __ng = __check_facet(this->_M_num_get);
>       __ng.get(*this, 0, *this, __err, __l);
>
>
>
>       if (__l < __gnu_cxx::__numeric_traits<short>::__min)
>  {
>    __err |= ios_base::failbit;
>    __n = __gnu_cxx::__numeric_traits<short>::__min;
>  }
>       else if (__l > __gnu_cxx::__numeric_traits<short>::__max)
>  {
>    __err |= ios_base::failbit;
>    __n = __gnu_cxx::__numeric_traits<short>::__max;
>  }
>       else
>  __n = short(__l);
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
>   if (__err)
>     this->setstate(__err);
> }
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    operator>>(int& __n)
>    {
>
>
>      sentry __cerb(*this, false);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>       long __l;
>       const __num_get_type& __ng = __check_facet(this->_M_num_get);
>       __ng.get(*this, 0, *this, __err, __l);
>
>
>
>       if (__l < __gnu_cxx::__numeric_traits<int>::__min)
>  {
>    __err |= ios_base::failbit;
>    __n = __gnu_cxx::__numeric_traits<int>::__min;
>  }
>       else if (__l > __gnu_cxx::__numeric_traits<int>::__max)
>  {
>    __err |= ios_base::failbit;
>    __n = __gnu_cxx::__numeric_traits<int>::__max;
>  }
>       else
>  __n = int(__l);
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
>   if (__err)
>     this->setstate(__err);
> }
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    operator>>(__streambuf_type* __sbout)
>    {
>      ios_base::iostate __err = ios_base::goodbit;
>      sentry __cerb(*this, false);
>      if (__cerb && __sbout)
> {
>   try
>     {
>       bool __ineof;
>       if (!__copy_streambufs_eof(this->rdbuf(), __sbout, __ineof))
>  __err |= ios_base::failbit;
>       if (__ineof)
>  __err |= ios_base::eofbit;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::failbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::failbit); }
> }
>      else if (!__sbout)
> __err |= ios_base::failbit;
>      if (__err)
> this->setstate(__err);
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    typename basic_istream<_CharT, _Traits>::int_type
>    basic_istream<_CharT, _Traits>::
>    get(void)
>    {
>      const int_type __eof = traits_type::eof();
>      int_type __c = __eof;
>      _M_gcount = 0;
>      ios_base::iostate __err = ios_base::goodbit;
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   try
>     {
>       __c = this->rdbuf()->sbumpc();
>
>       if (!traits_type::eq_int_type(__c, __eof))
>  _M_gcount = 1;
>       else
>  __err |= ios_base::eofbit;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
> }
>      if (!_M_gcount)
> __err |= ios_base::failbit;
>      if (__err)
> this->setstate(__err);
>      return __c;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    get(char_type& __c)
>    {
>      _M_gcount = 0;
>      ios_base::iostate __err = ios_base::goodbit;
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   try
>     {
>       const int_type __cb = this->rdbuf()->sbumpc();
>
>       if (!traits_type::eq_int_type(__cb, traits_type::eof()))
>  {
>    _M_gcount = 1;
>    __c = traits_type::to_char_type(__cb);
>  }
>       else
>  __err |= ios_base::eofbit;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
> }
>      if (!_M_gcount)
> __err |= ios_base::failbit;
>      if (__err)
> this->setstate(__err);
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    get(char_type* __s, streamsize __n, char_type __delim)
>    {
>      _M_gcount = 0;
>      ios_base::iostate __err = ios_base::goodbit;
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   try
>     {
>       const int_type __idelim = traits_type::to_int_type(__delim);
>       const int_type __eof = traits_type::eof();
>       __streambuf_type* __sb = this->rdbuf();
>       int_type __c = __sb->sgetc();
>
>       while (_M_gcount + 1 < __n
>       && !traits_type::eq_int_type(__c, __eof)
>       && !traits_type::eq_int_type(__c, __idelim))
>  {
>    *__s++ = traits_type::to_char_type(__c);
>    ++_M_gcount;
>    __c = __sb->snextc();
>  }
>       if (traits_type::eq_int_type(__c, __eof))
>  __err |= ios_base::eofbit;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
> }
>
>
>      if (__n > 0)
> *__s = char_type();
>      if (!_M_gcount)
> __err |= ios_base::failbit;
>      if (__err)
> this->setstate(__err);
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    get(__streambuf_type& __sb, char_type __delim)
>    {
>      _M_gcount = 0;
>      ios_base::iostate __err = ios_base::goodbit;
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   try
>     {
>       const int_type __idelim = traits_type::to_int_type(__delim);
>       const int_type __eof = traits_type::eof();
>       __streambuf_type* __this_sb = this->rdbuf();
>       int_type __c = __this_sb->sgetc();
>       char_type __c2 = traits_type::to_char_type(__c);
>
>       while (!traits_type::eq_int_type(__c, __eof)
>       && !traits_type::eq_int_type(__c, __idelim)
>       && !traits_type::eq_int_type(__sb.sputc(__c2), __eof))
>  {
>    ++_M_gcount;
>    __c = __this_sb->snextc();
>    __c2 = traits_type::to_char_type(__c);
>  }
>       if (traits_type::eq_int_type(__c, __eof))
>  __err |= ios_base::eofbit;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
> }
>      if (!_M_gcount)
> __err |= ios_base::failbit;
>      if (__err)
> this->setstate(__err);
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    getline(char_type* __s, streamsize __n, char_type __delim)
>    {
>      _M_gcount = 0;
>      ios_base::iostate __err = ios_base::goodbit;
>      sentry __cerb(*this, true);
>      if (__cerb)
>        {
>          try
>            {
>              const int_type __idelim = traits_type::to_int_type(__delim);
>              const int_type __eof = traits_type::eof();
>              __streambuf_type* __sb = this->rdbuf();
>              int_type __c = __sb->sgetc();
>
>              while (_M_gcount + 1 < __n
>                     && !traits_type::eq_int_type(__c, __eof)
>                     && !traits_type::eq_int_type(__c, __idelim))
>                {
>                  *__s++ = traits_type::to_char_type(__c);
>                  __c = __sb->snextc();
>                  ++_M_gcount;
>                }
>              if (traits_type::eq_int_type(__c, __eof))
>                __err |= ios_base::eofbit;
>              else
>                {
>                  if (traits_type::eq_int_type(__c, __idelim))
>                    {
>                      __sb->sbumpc();
>                      ++_M_gcount;
>                    }
>                  else
>                    __err |= ios_base::failbit;
>                }
>            }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>          catch(...)
>            { this->_M_setstate(ios_base::badbit); }
>        }
>
>
>      if (__n > 0)
> *__s = char_type();
>      if (!_M_gcount)
>        __err |= ios_base::failbit;
>      if (__err)
>        this->setstate(__err);
>      return *this;
>    }
>
>
>
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    ignore(void)
>    {
>      _M_gcount = 0;
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>       const int_type __eof = traits_type::eof();
>       __streambuf_type* __sb = this->rdbuf();
>
>       if (traits_type::eq_int_type(__sb->sbumpc(), __eof))
>  __err |= ios_base::eofbit;
>       else
>  _M_gcount = 1;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
>   if (__err)
>     this->setstate(__err);
> }
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    ignore(streamsize __n)
>    {
>      _M_gcount = 0;
>      sentry __cerb(*this, true);
>      if (__cerb && __n > 0)
>        {
>          ios_base::iostate __err = ios_base::goodbit;
>          try
>            {
>              const int_type __eof = traits_type::eof();
>              __streambuf_type* __sb = this->rdbuf();
>              int_type __c = __sb->sgetc();
># 521 "/usr/include/c++/8/bits/istream.tcc" 3
>       bool __large_ignore = false;
>       while (true)
>  {
>    while (_M_gcount < __n
>    && !traits_type::eq_int_type(__c, __eof))
>      {
>        ++_M_gcount;
>        __c = __sb->snextc();
>      }
>    if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max
>        && !traits_type::eq_int_type(__c, __eof))
>      {
>        _M_gcount =
>   __gnu_cxx::__numeric_traits<streamsize>::__min;
>        __large_ignore = true;
>      }
>    else
>      break;
>  }
>
>       if (__large_ignore)
>  _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;
>
>       if (traits_type::eq_int_type(__c, __eof))
>                __err |= ios_base::eofbit;
>            }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>          catch(...)
>            { this->_M_setstate(ios_base::badbit); }
>          if (__err)
>            this->setstate(__err);
>        }
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    ignore(streamsize __n, int_type __delim)
>    {
>      _M_gcount = 0;
>      sentry __cerb(*this, true);
>      if (__cerb && __n > 0)
>        {
>          ios_base::iostate __err = ios_base::goodbit;
>          try
>            {
>              const int_type __eof = traits_type::eof();
>              __streambuf_type* __sb = this->rdbuf();
>              int_type __c = __sb->sgetc();
>
>
>       bool __large_ignore = false;
>       while (true)
>  {
>    while (_M_gcount < __n
>    && !traits_type::eq_int_type(__c, __eof)
>    && !traits_type::eq_int_type(__c, __delim))
>      {
>        ++_M_gcount;
>        __c = __sb->snextc();
>      }
>    if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max
>        && !traits_type::eq_int_type(__c, __eof)
>        && !traits_type::eq_int_type(__c, __delim))
>      {
>        _M_gcount =
>   __gnu_cxx::__numeric_traits<streamsize>::__min;
>        __large_ignore = true;
>      }
>    else
>      break;
>  }
>
>       if (__large_ignore)
>  _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;
>
>              if (traits_type::eq_int_type(__c, __eof))
>                __err |= ios_base::eofbit;
>       else if (traits_type::eq_int_type(__c, __delim))
>  {
>    if (_M_gcount
>        < __gnu_cxx::__numeric_traits<streamsize>::__max)
>      ++_M_gcount;
>    __sb->sbumpc();
>  }
>            }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>          catch(...)
>            { this->_M_setstate(ios_base::badbit); }
>          if (__err)
>            this->setstate(__err);
>        }
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    typename basic_istream<_CharT, _Traits>::int_type
>    basic_istream<_CharT, _Traits>::
>    peek(void)
>    {
>      int_type __c = traits_type::eof();
>      _M_gcount = 0;
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>       __c = this->rdbuf()->sgetc();
>       if (traits_type::eq_int_type(__c, traits_type::eof()))
>  __err |= ios_base::eofbit;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
>   if (__err)
>     this->setstate(__err);
> }
>      return __c;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    read(char_type* __s, streamsize __n)
>    {
>      _M_gcount = 0;
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>       _M_gcount = this->rdbuf()->sgetn(__s, __n);
>       if (_M_gcount != __n)
>  __err |= (ios_base::eofbit | ios_base::failbit);
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
>   if (__err)
>     this->setstate(__err);
> }
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    streamsize
>    basic_istream<_CharT, _Traits>::
>    readsome(char_type* __s, streamsize __n)
>    {
>      _M_gcount = 0;
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>
>       const streamsize __num = this->rdbuf()->in_avail();
>       if (__num > 0)
>  _M_gcount = this->rdbuf()->sgetn(__s, std::min(__num, __n));
>       else if (__num == -1)
>  __err |= ios_base::eofbit;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
>   if (__err)
>     this->setstate(__err);
> }
>      return _M_gcount;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    putback(char_type __c)
>    {
>
>
>      _M_gcount = 0;
>
>      this->clear(this->rdstate() & ~ios_base::eofbit);
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>       const int_type __eof = traits_type::eof();
>       __streambuf_type* __sb = this->rdbuf();
>       if (!__sb
>    || traits_type::eq_int_type(__sb->sputbackc(__c), __eof))
>  __err |= ios_base::badbit;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
>   if (__err)
>     this->setstate(__err);
> }
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    unget(void)
>    {
>
>
>      _M_gcount = 0;
>
>      this->clear(this->rdstate() & ~ios_base::eofbit);
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>       const int_type __eof = traits_type::eof();
>       __streambuf_type* __sb = this->rdbuf();
>       if (!__sb
>    || traits_type::eq_int_type(__sb->sungetc(), __eof))
>  __err |= ios_base::badbit;
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
>   if (__err)
>     this->setstate(__err);
> }
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    int
>    basic_istream<_CharT, _Traits>::
>    sync(void)
>    {
>
>
>      int __ret = -1;
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>       __streambuf_type* __sb = this->rdbuf();
>       if (__sb)
>  {
>    if (__sb->pubsync() == -1)
>      __err |= ios_base::badbit;
>    else
>      __ret = 0;
>  }
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
>   if (__err)
>     this->setstate(__err);
> }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    typename basic_istream<_CharT, _Traits>::pos_type
>    basic_istream<_CharT, _Traits>::
>    tellg(void)
>    {
>
>
>      pos_type __ret = pos_type(-1);
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   try
>     {
>       if (!this->fail())
>  __ret = this->rdbuf()->pubseekoff(0, ios_base::cur,
>        ios_base::in);
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
> }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    seekg(pos_type __pos)
>    {
>
>
>
>      this->clear(this->rdstate() & ~ios_base::eofbit);
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>       if (!this->fail())
>  {
>
>    const pos_type __p = this->rdbuf()->pubseekpos(__pos,
>         ios_base::in);
>
>
>    if (__p == pos_type(off_type(-1)))
>      __err |= ios_base::failbit;
>  }
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
>   if (__err)
>     this->setstate(__err);
> }
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    basic_istream<_CharT, _Traits>::
>    seekg(off_type __off, ios_base::seekdir __dir)
>    {
>
>
>
>      this->clear(this->rdstate() & ~ios_base::eofbit);
>      sentry __cerb(*this, true);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>       if (!this->fail())
>  {
>
>    const pos_type __p = this->rdbuf()->pubseekoff(__off, __dir,
>         ios_base::in);
>
>
>    if (__p == pos_type(off_type(-1)))
>      __err |= ios_base::failbit;
>  }
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       this->_M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { this->_M_setstate(ios_base::badbit); }
>   if (__err)
>     this->setstate(__err);
> }
>      return *this;
>    }
>
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
>    {
>      typedef basic_istream<_CharT, _Traits> __istream_type;
>      typedef typename __istream_type::int_type __int_type;
>
>      typename __istream_type::sentry __cerb(__in, false);
>      if (__cerb)
> {
>   ios_base::iostate __err = ios_base::goodbit;
>   try
>     {
>       const __int_type __cb = __in.rdbuf()->sbumpc();
>       if (!_Traits::eq_int_type(__cb, _Traits::eof()))
>  __c = _Traits::to_char_type(__cb);
>       else
>  __err |= (ios_base::eofbit | ios_base::failbit);
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       __in._M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { __in._M_setstate(ios_base::badbit); }
>   if (__err)
>     __in.setstate(__err);
> }
>      return __in;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
>    {
>      typedef basic_istream<_CharT, _Traits> __istream_type;
>      typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
>      typedef typename _Traits::int_type int_type;
>      typedef _CharT char_type;
>      typedef ctype<_CharT> __ctype_type;
>
>      streamsize __extracted = 0;
>      ios_base::iostate __err = ios_base::goodbit;
>      typename __istream_type::sentry __cerb(__in, false);
>      if (__cerb)
> {
>   try
>     {
>
>       streamsize __num = __in.width();
>       if (__num <= 0)
>  __num = __gnu_cxx::__numeric_traits<streamsize>::__max;
>
>       const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
>
>       const int_type __eof = _Traits::eof();
>       __streambuf_type* __sb = __in.rdbuf();
>       int_type __c = __sb->sgetc();
>
>       while (__extracted < __num - 1
>       && !_Traits::eq_int_type(__c, __eof)
>       && !__ct.is(ctype_base::space,
>     _Traits::to_char_type(__c)))
>  {
>    *__s++ = _Traits::to_char_type(__c);
>    ++__extracted;
>    __c = __sb->snextc();
>  }
>       if (_Traits::eq_int_type(__c, __eof))
>  __err |= ios_base::eofbit;
>
>
>
>       *__s = char_type();
>       __in.width(0);
>     }
>   catch(__cxxabiv1::__forced_unwind&)
>     {
>       __in._M_setstate(ios_base::badbit);
>       throw;
>     }
>   catch(...)
>     { __in._M_setstate(ios_base::badbit); }
> }
>      if (!__extracted)
> __err |= ios_base::failbit;
>      if (__err)
> __in.setstate(__err);
>      return __in;
>    }
>
>
>  template<typename _CharT, typename _Traits>
>    basic_istream<_CharT, _Traits>&
>    ws(basic_istream<_CharT, _Traits>& __in)
>    {
>      typedef basic_istream<_CharT, _Traits> __istream_type;
>      typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
>      typedef typename __istream_type::int_type __int_type;
>      typedef ctype<_CharT> __ctype_type;
>
>      const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
>      const __int_type __eof = _Traits::eof();
>      __streambuf_type* __sb = __in.rdbuf();
>      __int_type __c = __sb->sgetc();
>
>      while (!_Traits::eq_int_type(__c, __eof)
>      && __ct.is(ctype_base::space, _Traits::to_char_type(__c)))
> __c = __sb->snextc();
>
>       if (_Traits::eq_int_type(__c, __eof))
>  __in.setstate(ios_base::eofbit);
>      return __in;
>    }
>
>
>
>
>  extern template class basic_istream<char>;
>  extern template istream& ws(istream&);
>  extern template istream& operator>>(istream&, char&);
>  extern template istream& operator>>(istream&, char*);
>  extern template istream& operator>>(istream&, unsigned char&);
>  extern template istream& operator>>(istream&, signed char&);
>  extern template istream& operator>>(istream&, unsigned char*);
>  extern template istream& operator>>(istream&, signed char*);
>
>  extern template istream& istream::_M_extract(unsigned short&);
>  extern template istream& istream::_M_extract(unsigned int&);
>  extern template istream& istream::_M_extract(long&);
>  extern template istream& istream::_M_extract(unsigned long&);
>  extern template istream& istream::_M_extract(bool&);
>
>  extern template istream& istream::_M_extract(long long&);
>  extern template istream& istream::_M_extract(unsigned long long&);
>
>  extern template istream& istream::_M_extract(float&);
>  extern template istream& istream::_M_extract(double&);
>  extern template istream& istream::_M_extract(long double&);
>  extern template istream& istream::_M_extract(void*&);
>
>  extern template class basic_iostream<char>;
>
>
>  extern template class basic_istream<wchar_t>;
>  extern template wistream& ws(wistream&);
>  extern template wistream& operator>>(wistream&, wchar_t&);
>  extern template wistream& operator>>(wistream&, wchar_t*);
>
>  extern template wistream& wistream::_M_extract(unsigned short&);
>  extern template wistream& wistream::_M_extract(unsigned int&);
>  extern template wistream& wistream::_M_extract(long&);
>  extern template wistream& wistream::_M_extract(unsigned long&);
>  extern template wistream& wistream::_M_extract(bool&);
>
>  extern template wistream& wistream::_M_extract(long long&);
>  extern template wistream& wistream::_M_extract(unsigned long long&);
>
>  extern template wistream& wistream::_M_extract(float&);
>  extern template wistream& wistream::_M_extract(double&);
>  extern template wistream& wistream::_M_extract(long double&);
>  extern template wistream& wistream::_M_extract(void*&);
>
>  extern template class basic_iostream<wchar_t>;
>
>
>
>
>}
># 992 "/usr/include/c++/8/istream" 2 3
># 39 "/usr/include/c++/8/fstream" 2 3
>
># 1 "/usr/include/c++/8/bits/codecvt.h" 1 3
># 39 "/usr/include/c++/8/bits/codecvt.h" 3
>       
># 40 "/usr/include/c++/8/bits/codecvt.h" 3
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>  class codecvt_base
>  {
>  public:
>    enum result
>    {
>      ok,
>      partial,
>      error,
>      noconv
>    };
>  };
># 67 "/usr/include/c++/8/bits/codecvt.h" 3
>  template<typename _InternT, typename _ExternT, typename _StateT>
>    class __codecvt_abstract_base
>    : public locale::facet, public codecvt_base
>    {
>    public:
>
>      typedef codecvt_base::result result;
>      typedef _InternT intern_type;
>      typedef _ExternT extern_type;
>      typedef _StateT state_type;
># 115 "/usr/include/c++/8/bits/codecvt.h" 3
>      result
>      out(state_type& __state, const intern_type* __from,
>   const intern_type* __from_end, const intern_type*& __from_next,
>   extern_type* __to, extern_type* __to_end,
>   extern_type*& __to_next) const
>      {
> return this->do_out(__state, __from, __from_end, __from_next,
>       __to, __to_end, __to_next);
>      }
># 154 "/usr/include/c++/8/bits/codecvt.h" 3
>      result
>      unshift(state_type& __state, extern_type* __to, extern_type* __to_end,
>       extern_type*& __to_next) const
>      { return this->do_unshift(__state, __to,__to_end,__to_next); }
># 195 "/usr/include/c++/8/bits/codecvt.h" 3
>      result
>      in(state_type& __state, const extern_type* __from,
>  const extern_type* __from_end, const extern_type*& __from_next,
>  intern_type* __to, intern_type* __to_end,
>  intern_type*& __to_next) const
>      {
> return this->do_in(__state, __from, __from_end, __from_next,
>      __to, __to_end, __to_next);
>      }
>
>      int
>      encoding() const throw()
>      { return this->do_encoding(); }
>
>      bool
>      always_noconv() const throw()
>      { return this->do_always_noconv(); }
>
>      int
>      length(state_type& __state, const extern_type* __from,
>      const extern_type* __end, size_t __max) const
>      { return this->do_length(__state, __from, __end, __max); }
>
>      int
>      max_length() const throw()
>      { return this->do_max_length(); }
>
>    protected:
>      explicit
>      __codecvt_abstract_base(size_t __refs = 0) : locale::facet(__refs) { }
>
>      virtual
>      ~__codecvt_abstract_base() { }
># 236 "/usr/include/c++/8/bits/codecvt.h" 3
>      virtual result
>      do_out(state_type& __state, const intern_type* __from,
>      const intern_type* __from_end, const intern_type*& __from_next,
>      extern_type* __to, extern_type* __to_end,
>      extern_type*& __to_next) const = 0;
>
>      virtual result
>      do_unshift(state_type& __state, extern_type* __to,
>   extern_type* __to_end, extern_type*& __to_next) const = 0;
>
>      virtual result
>      do_in(state_type& __state, const extern_type* __from,
>     const extern_type* __from_end, const extern_type*& __from_next,
>     intern_type* __to, intern_type* __to_end,
>     intern_type*& __to_next) const = 0;
>
>      virtual int
>      do_encoding() const throw() = 0;
>
>      virtual bool
>      do_always_noconv() const throw() = 0;
>
>      virtual int
>      do_length(state_type&, const extern_type* __from,
>  const extern_type* __end, size_t __max) const = 0;
>
>      virtual int
>      do_max_length() const throw() = 0;
>    };
># 273 "/usr/include/c++/8/bits/codecvt.h" 3
>   template<typename _InternT, typename _ExternT, typename _StateT>
>    class codecvt
>    : public __codecvt_abstract_base<_InternT, _ExternT, _StateT>
>    {
>    public:
>
>      typedef codecvt_base::result result;
>      typedef _InternT intern_type;
>      typedef _ExternT extern_type;
>      typedef _StateT state_type;
>
>    protected:
>      __c_locale _M_c_locale_codecvt;
>
>    public:
>      static locale::id id;
>
>      explicit
>      codecvt(size_t __refs = 0)
>      : __codecvt_abstract_base<_InternT, _ExternT, _StateT> (__refs),
> _M_c_locale_codecvt(0)
>      { }
>
>      explicit
>      codecvt(__c_locale __cloc, size_t __refs = 0);
>
>    protected:
>      virtual
>      ~codecvt() { }
>
>      virtual result
>      do_out(state_type& __state, const intern_type* __from,
>      const intern_type* __from_end, const intern_type*& __from_next,
>      extern_type* __to, extern_type* __to_end,
>      extern_type*& __to_next) const;
>
>      virtual result
>      do_unshift(state_type& __state, extern_type* __to,
>   extern_type* __to_end, extern_type*& __to_next) const;
>
>      virtual result
>      do_in(state_type& __state, const extern_type* __from,
>     const extern_type* __from_end, const extern_type*& __from_next,
>     intern_type* __to, intern_type* __to_end,
>     intern_type*& __to_next) const;
>
>      virtual int
>      do_encoding() const throw();
>
>      virtual bool
>      do_always_noconv() const throw();
>
>      virtual int
>      do_length(state_type&, const extern_type* __from,
>  const extern_type* __end, size_t __max) const;
>
>      virtual int
>      do_max_length() const throw();
>    };
>
>  template<typename _InternT, typename _ExternT, typename _StateT>
>    locale::id codecvt<_InternT, _ExternT, _StateT>::id;
>
>
>  template<>
>    class codecvt<char, char, mbstate_t>
>    : public __codecvt_abstract_base<char, char, mbstate_t>
>    {
>      friend class messages<char>;
>
>    public:
>
>      typedef char intern_type;
>      typedef char extern_type;
>      typedef mbstate_t state_type;
>
>    protected:
>      __c_locale _M_c_locale_codecvt;
>
>    public:
>      static locale::id id;
>
>      explicit
>      codecvt(size_t __refs = 0);
>
>      explicit
>      codecvt(__c_locale __cloc, size_t __refs = 0);
>
>    protected:
>      virtual
>      ~codecvt();
>
>      virtual result
>      do_out(state_type& __state, const intern_type* __from,
>      const intern_type* __from_end, const intern_type*& __from_next,
>      extern_type* __to, extern_type* __to_end,
>      extern_type*& __to_next) const;
>
>      virtual result
>      do_unshift(state_type& __state, extern_type* __to,
>   extern_type* __to_end, extern_type*& __to_next) const;
>
>      virtual result
>      do_in(state_type& __state, const extern_type* __from,
>     const extern_type* __from_end, const extern_type*& __from_next,
>     intern_type* __to, intern_type* __to_end,
>     intern_type*& __to_next) const;
>
>      virtual int
>      do_encoding() const throw();
>
>      virtual bool
>      do_always_noconv() const throw();
>
>      virtual int
>      do_length(state_type&, const extern_type* __from,
>  const extern_type* __end, size_t __max) const;
>
>      virtual int
>      do_max_length() const throw();
>  };
>
>
>
>
>
>
>  template<>
>    class codecvt<wchar_t, char, mbstate_t>
>    : public __codecvt_abstract_base<wchar_t, char, mbstate_t>
>    {
>      friend class messages<wchar_t>;
>
>    public:
>
>      typedef wchar_t intern_type;
>      typedef char extern_type;
>      typedef mbstate_t state_type;
>
>    protected:
>      __c_locale _M_c_locale_codecvt;
>
>    public:
>      static locale::id id;
>
>      explicit
>      codecvt(size_t __refs = 0);
>
>      explicit
>      codecvt(__c_locale __cloc, size_t __refs = 0);
>
>    protected:
>      virtual
>      ~codecvt();
>
>      virtual result
>      do_out(state_type& __state, const intern_type* __from,
>      const intern_type* __from_end, const intern_type*& __from_next,
>      extern_type* __to, extern_type* __to_end,
>      extern_type*& __to_next) const;
>
>      virtual result
>      do_unshift(state_type& __state,
>   extern_type* __to, extern_type* __to_end,
>   extern_type*& __to_next) const;
>
>      virtual result
>      do_in(state_type& __state,
>      const extern_type* __from, const extern_type* __from_end,
>      const extern_type*& __from_next,
>      intern_type* __to, intern_type* __to_end,
>      intern_type*& __to_next) const;
>
>      virtual
>      int do_encoding() const throw();
>
>      virtual
>      bool do_always_noconv() const throw();
>
>      virtual
>      int do_length(state_type&, const extern_type* __from,
>      const extern_type* __end, size_t __max) const;
>
>      virtual int
>      do_max_length() const throw();
>    };
># 467 "/usr/include/c++/8/bits/codecvt.h" 3
>  template<>
>    class codecvt<char16_t, char, mbstate_t>
>    : public __codecvt_abstract_base<char16_t, char, mbstate_t>
>    {
>    public:
>
>      typedef char16_t intern_type;
>      typedef char extern_type;
>      typedef mbstate_t state_type;
>
>    public:
>      static locale::id id;
>
>      explicit
>      codecvt(size_t __refs = 0)
>      : __codecvt_abstract_base<char16_t, char, mbstate_t>(__refs) { }
>
>    protected:
>      virtual
>      ~codecvt();
>
>      virtual result
>      do_out(state_type& __state, const intern_type* __from,
>      const intern_type* __from_end, const intern_type*& __from_next,
>      extern_type* __to, extern_type* __to_end,
>      extern_type*& __to_next) const;
>
>      virtual result
>      do_unshift(state_type& __state,
>   extern_type* __to, extern_type* __to_end,
>   extern_type*& __to_next) const;
>
>      virtual result
>      do_in(state_type& __state,
>      const extern_type* __from, const extern_type* __from_end,
>      const extern_type*& __from_next,
>      intern_type* __to, intern_type* __to_end,
>      intern_type*& __to_next) const;
>
>      virtual
>      int do_encoding() const throw();
>
>      virtual
>      bool do_always_noconv() const throw();
>
>      virtual
>      int do_length(state_type&, const extern_type* __from,
>      const extern_type* __end, size_t __max) const;
>
>      virtual int
>      do_max_length() const throw();
>    };
>
>
>
>
>
>  template<>
>    class codecvt<char32_t, char, mbstate_t>
>    : public __codecvt_abstract_base<char32_t, char, mbstate_t>
>    {
>    public:
>
>      typedef char32_t intern_type;
>      typedef char extern_type;
>      typedef mbstate_t state_type;
>
>    public:
>      static locale::id id;
>
>      explicit
>      codecvt(size_t __refs = 0)
>      : __codecvt_abstract_base<char32_t, char, mbstate_t>(__refs) { }
>
>    protected:
>      virtual
>      ~codecvt();
>
>      virtual result
>      do_out(state_type& __state, const intern_type* __from,
>      const intern_type* __from_end, const intern_type*& __from_next,
>      extern_type* __to, extern_type* __to_end,
>      extern_type*& __to_next) const;
>
>      virtual result
>      do_unshift(state_type& __state,
>   extern_type* __to, extern_type* __to_end,
>   extern_type*& __to_next) const;
>
>      virtual result
>      do_in(state_type& __state,
>      const extern_type* __from, const extern_type* __from_end,
>      const extern_type*& __from_next,
>      intern_type* __to, intern_type* __to_end,
>      intern_type*& __to_next) const;
>
>      virtual
>      int do_encoding() const throw();
>
>      virtual
>      bool do_always_noconv() const throw();
>
>      virtual
>      int do_length(state_type&, const extern_type* __from,
>      const extern_type* __end, size_t __max) const;
>
>      virtual int
>      do_max_length() const throw();
>    };
>
>
>
>
>
>  template<typename _InternT, typename _ExternT, typename _StateT>
>    class codecvt_byname : public codecvt<_InternT, _ExternT, _StateT>
>    {
>    public:
>      explicit
>      codecvt_byname(const char* __s, size_t __refs = 0)
>      : codecvt<_InternT, _ExternT, _StateT>(__refs)
>      {
> if (__builtin_strcmp(__s, "C") != 0
>     && __builtin_strcmp(__s, "POSIX") != 0)
>   {
>     this->_S_destroy_c_locale(this->_M_c_locale_codecvt);
>     this->_S_create_c_locale(this->_M_c_locale_codecvt, __s);
>   }
>      }
>
>
>      explicit
>      codecvt_byname(const string& __s, size_t __refs = 0)
>      : codecvt_byname(__s.c_str(), __refs) { }
>
>
>    protected:
>      virtual
>      ~codecvt_byname() { }
>    };
>
>
>  template<>
>    class codecvt_byname<char16_t, char, mbstate_t>
>    : public codecvt<char16_t, char, mbstate_t>
>    {
>    public:
>      explicit
>      codecvt_byname(const char*, size_t __refs = 0)
>      : codecvt<char16_t, char, mbstate_t>(__refs) { }
>
>      explicit
>      codecvt_byname(const string& __s, size_t __refs = 0)
>      : codecvt_byname(__s.c_str(), __refs) { }
>
>    protected:
>      virtual
>      ~codecvt_byname() { }
>    };
>
>  template<>
>    class codecvt_byname<char32_t, char, mbstate_t>
>    : public codecvt<char32_t, char, mbstate_t>
>    {
>    public:
>      explicit
>      codecvt_byname(const char*, size_t __refs = 0)
>      : codecvt<char32_t, char, mbstate_t>(__refs) { }
>
>      explicit
>      codecvt_byname(const string& __s, size_t __refs = 0)
>      : codecvt_byname(__s.c_str(), __refs) { }
>
>    protected:
>      virtual
>      ~codecvt_byname() { }
>    };
>
>
>
>
>
>  extern template class codecvt_byname<char, char, mbstate_t>;
>
>  extern template
>    const codecvt<char, char, mbstate_t>&
>    use_facet<codecvt<char, char, mbstate_t> >(const locale&);
>
>  extern template
>    bool
>    has_facet<codecvt<char, char, mbstate_t> >(const locale&);
>
>
>  extern template class codecvt_byname<wchar_t, char, mbstate_t>;
>
>  extern template
>    const codecvt<wchar_t, char, mbstate_t>&
>    use_facet<codecvt<wchar_t, char, mbstate_t> >(const locale&);
>
>  extern template
>    bool
>    has_facet<codecvt<wchar_t, char, mbstate_t> >(const locale&);
>
>
>
>  extern template class codecvt_byname<char16_t, char, mbstate_t>;
>  extern template class codecvt_byname<char32_t, char, mbstate_t>;
>
>
>
>
>
>}
># 41 "/usr/include/c++/8/fstream" 2 3
># 1 "/usr/include/c++/8/cstdio" 1 3
># 39 "/usr/include/c++/8/cstdio" 3
>       
># 40 "/usr/include/c++/8/cstdio" 3
># 42 "/usr/include/c++/8/fstream" 2 3
># 1 "/usr/include/c++/8/x86_64-redhat-linux/bits/basic_file.h" 1 3
># 37 "/usr/include/c++/8/x86_64-redhat-linux/bits/basic_file.h" 3
>       
># 38 "/usr/include/c++/8/x86_64-redhat-linux/bits/basic_file.h" 3
>
>
># 1 "/usr/include/c++/8/x86_64-redhat-linux/bits/c++io.h" 1 3
># 35 "/usr/include/c++/8/x86_64-redhat-linux/bits/c++io.h" 3
># 1 "/usr/include/c++/8/cstdio" 1 3
># 39 "/usr/include/c++/8/cstdio" 3
>       
># 40 "/usr/include/c++/8/cstdio" 3
># 36 "/usr/include/c++/8/x86_64-redhat-linux/bits/c++io.h" 2 3
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  typedef __gthread_mutex_t __c_lock;
>
>
>  typedef FILE __c_file;
>
>
>}
># 41 "/usr/include/c++/8/x86_64-redhat-linux/bits/basic_file.h" 2 3
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>
>  template<typename _CharT>
>    class __basic_file;
>
>
>  template<>
>    class __basic_file<char>
>    {
>
>      __c_file* _M_cfile;
>
>
>      bool _M_cfile_created;
>
>    public:
>      __basic_file(__c_lock* __lock = 0) throw ();
>
>
>      __basic_file(__basic_file&& __rv, __c_lock* = 0) noexcept
>      : _M_cfile(__rv._M_cfile), _M_cfile_created(__rv._M_cfile_created)
>      {
> __rv._M_cfile = nullptr;
> __rv._M_cfile_created = false;
>      }
>
>      __basic_file& operator=(const __basic_file&) = delete;
>      __basic_file& operator=(__basic_file&&) = delete;
>
>      void
>      swap(__basic_file& __f) noexcept
>      {
> std::swap(_M_cfile, __f._M_cfile);
> std::swap(_M_cfile_created, __f._M_cfile_created);
>      }
>
>
>      __basic_file*
>      open(const char* __name, ios_base::openmode __mode, int __prot = 0664);
>
>      __basic_file*
>      sys_open(__c_file* __file, ios_base::openmode);
>
>      __basic_file*
>      sys_open(int __fd, ios_base::openmode __mode) throw ();
>
>      __basic_file*
>      close();
>
>      __attribute__ ((__pure__)) bool
>      is_open() const throw ();
>
>      __attribute__ ((__pure__)) int
>      fd() throw ();
>
>      __attribute__ ((__pure__)) __c_file*
>      file() throw ();
>
>      ~__basic_file();
>
>      streamsize
>      xsputn(const char* __s, streamsize __n);
>
>      streamsize
>      xsputn_2(const char* __s1, streamsize __n1,
>        const char* __s2, streamsize __n2);
>
>      streamsize
>      xsgetn(char* __s, streamsize __n);
>
>      streamoff
>      seekoff(streamoff __off, ios_base::seekdir __way) throw ();
>
>      int
>      sync();
>
>      streamsize
>      showmanyc();
>    };
>
>
>}
># 43 "/usr/include/c++/8/fstream" 2 3
>
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
># 79 "/usr/include/c++/8/fstream" 3
>  template<typename _CharT, typename _Traits>
>    class basic_filebuf : public basic_streambuf<_CharT, _Traits>
>    {
>
>      template<typename _Tp>
> using __chk_state = __and_<is_copy_assignable<_Tp>,
>       is_copy_constructible<_Tp>,
>       is_default_constructible<_Tp>>;
>
>      static_assert(__chk_state<typename _Traits::state_type>::value,
>      "state_type must be CopyAssignable, CopyConstructible"
>      " and DefaultConstructible");
>
>      static_assert(is_same<typename _Traits::pos_type,
>       fpos<typename _Traits::state_type>>::value,
>      "pos_type must be fpos<state_type>");
>
>    public:
>
>      typedef _CharT char_type;
>      typedef _Traits traits_type;
>      typedef typename traits_type::int_type int_type;
>      typedef typename traits_type::pos_type pos_type;
>      typedef typename traits_type::off_type off_type;
>
>      typedef basic_streambuf<char_type, traits_type> __streambuf_type;
>      typedef basic_filebuf<char_type, traits_type> __filebuf_type;
>      typedef __basic_file<char> __file_type;
>      typedef typename traits_type::state_type __state_type;
>      typedef codecvt<char_type, char, __state_type> __codecvt_type;
>
>      friend class ios_base;
>
>    protected:
>
>
>      __c_lock _M_lock;
>
>
>      __file_type _M_file;
>
>
>      ios_base::openmode _M_mode;
>
>
>      __state_type _M_state_beg;
>
>
>
>
>      __state_type _M_state_cur;
>
>
>
>      __state_type _M_state_last;
>
>
>      char_type* _M_buf;
>
>
>
>
>
>
>      size_t _M_buf_size;
>
>
>      bool _M_buf_allocated;
># 155 "/usr/include/c++/8/fstream" 3
>      bool _M_reading;
>      bool _M_writing;
>
>
>
>
>
>
>
>      char_type _M_pback;
>      char_type* _M_pback_cur_save;
>      char_type* _M_pback_end_save;
>      bool _M_pback_init;
>
>
>
>      const __codecvt_type* _M_codecvt;
>
>
>
>
>
>
>      char* _M_ext_buf;
>
>
>
>
>      streamsize _M_ext_buf_size;
>
>
>
>
>
>
>      const char* _M_ext_next;
>      char* _M_ext_end;
>
>
>
>
>
>
>      void
>      _M_create_pback()
>      {
> if (!_M_pback_init)
>   {
>     _M_pback_cur_save = this->gptr();
>     _M_pback_end_save = this->egptr();
>     this->setg(&_M_pback, &_M_pback, &_M_pback + 1);
>     _M_pback_init = true;
>   }
>      }
>
>
>
>
>
>
>      void
>      _M_destroy_pback() throw()
>      {
> if (_M_pback_init)
>   {
>
>     _M_pback_cur_save += this->gptr() != this->eback();
>     this->setg(_M_buf, _M_pback_cur_save, _M_pback_end_save);
>     _M_pback_init = false;
>   }
>      }
>
>    public:
>
>
>
>
>
>
>
>      basic_filebuf();
>
>
>      basic_filebuf(const basic_filebuf&) = delete;
>      basic_filebuf(basic_filebuf&&);
>
>
>
>
>
>      virtual
>      ~basic_filebuf()
>      { this->close(); }
>
>
>      basic_filebuf& operator=(const basic_filebuf&) = delete;
>      basic_filebuf& operator=(basic_filebuf&&);
>      void swap(basic_filebuf&);
>
>
>
>
>
>
>      bool
>      is_open() const throw()
>      { return _M_file.is_open(); }
># 304 "/usr/include/c++/8/fstream" 3
>      __filebuf_type*
>      open(const char* __s, ios_base::openmode __mode);
># 314 "/usr/include/c++/8/fstream" 3
>      __filebuf_type*
>      open(const std::string& __s, ios_base::openmode __mode)
>      { return open(__s.c_str(), __mode); }
># 344 "/usr/include/c++/8/fstream" 3
>      __filebuf_type*
>      close();
>
>    protected:
>      void
>      _M_allocate_internal_buffer();
>
>      void
>      _M_destroy_internal_buffer() throw();
>
>
>      virtual streamsize
>      showmanyc();
>
>
>
>
>
>
>      virtual int_type
>      underflow();
>
>      virtual int_type
>      pbackfail(int_type __c = _Traits::eof());
># 376 "/usr/include/c++/8/fstream" 3
>      virtual int_type
>      overflow(int_type __c = _Traits::eof());
>
>
>
>      bool
>      _M_convert_to_external(char_type*, streamsize);
># 396 "/usr/include/c++/8/fstream" 3
>      virtual __streambuf_type*
>      setbuf(char_type* __s, streamsize __n);
>
>      virtual pos_type
>      seekoff(off_type __off, ios_base::seekdir __way,
>       ios_base::openmode __mode = ios_base::in | ios_base::out);
>
>      virtual pos_type
>      seekpos(pos_type __pos,
>       ios_base::openmode __mode = ios_base::in | ios_base::out);
>
>
>      pos_type
>      _M_seek(off_type __off, ios_base::seekdir __way, __state_type __state);
>
>      int
>      _M_get_ext_pos(__state_type &__state);
>
>      virtual int
>      sync();
>
>      virtual void
>      imbue(const locale& __loc);
>
>      virtual streamsize
>      xsgetn(char_type* __s, streamsize __n);
>
>      virtual streamsize
>      xsputn(const char_type* __s, streamsize __n);
>
>
>      bool
>      _M_terminate_output();
># 442 "/usr/include/c++/8/fstream" 3
>      void
>      _M_set_buffer(streamsize __off)
>      {
> const bool __testin = _M_mode & ios_base::in;
> const bool __testout = (_M_mode & ios_base::out
>    || _M_mode & ios_base::app);
>
> if (__testin && __off > 0)
>   this->setg(_M_buf, _M_buf, _M_buf + __off);
> else
>   this->setg(_M_buf, _M_buf, _M_buf);
>
> if (__testout && __off == 0 && _M_buf_size > 1 )
>   this->setp(_M_buf, _M_buf + _M_buf_size - 1);
> else
>   this->setp(0, 0);
>      }
>    };
># 475 "/usr/include/c++/8/fstream" 3
>  template<typename _CharT, typename _Traits>
>    class basic_ifstream : public basic_istream<_CharT, _Traits>
>    {
>    public:
>
>      typedef _CharT char_type;
>      typedef _Traits traits_type;
>      typedef typename traits_type::int_type int_type;
>      typedef typename traits_type::pos_type pos_type;
>      typedef typename traits_type::off_type off_type;
>
>
>      typedef basic_filebuf<char_type, traits_type> __filebuf_type;
>      typedef basic_istream<char_type, traits_type> __istream_type;
>
>    private:
>      __filebuf_type _M_filebuf;
>
>    public:
># 502 "/usr/include/c++/8/fstream" 3
>      basic_ifstream() : __istream_type(), _M_filebuf()
>      { this->init(&_M_filebuf); }
># 512 "/usr/include/c++/8/fstream" 3
>      explicit
>      basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in)
>      : __istream_type(), _M_filebuf()
>      {
> this->init(&_M_filebuf);
> this->open(__s, __mode);
>      }
># 528 "/usr/include/c++/8/fstream" 3
>      explicit
>      basic_ifstream(const std::string& __s,
>       ios_base::openmode __mode = ios_base::in)
>      : __istream_type(), _M_filebuf()
>      {
> this->init(&_M_filebuf);
> this->open(__s, __mode);
>      }
># 552 "/usr/include/c++/8/fstream" 3
>      basic_ifstream(const basic_ifstream&) = delete;
>
>      basic_ifstream(basic_ifstream&& __rhs)
>      : __istream_type(std::move(__rhs)),
>      _M_filebuf(std::move(__rhs._M_filebuf))
>      { __istream_type::set_rdbuf(&_M_filebuf); }
># 566 "/usr/include/c++/8/fstream" 3
>      ~basic_ifstream()
>      { }
>
>
>
>
>      basic_ifstream&
>      operator=(const basic_ifstream&) = delete;
>
>      basic_ifstream&
>      operator=(basic_ifstream&& __rhs)
>      {
> __istream_type::operator=(std::move(__rhs));
> _M_filebuf = std::move(__rhs._M_filebuf);
> return *this;
>      }
>
>      void
>      swap(basic_ifstream& __rhs)
>      {
> __istream_type::swap(__rhs);
> _M_filebuf.swap(__rhs._M_filebuf);
>      }
># 598 "/usr/include/c++/8/fstream" 3
>      __filebuf_type*
>      rdbuf() const
>      { return const_cast<__filebuf_type*>(&_M_filebuf); }
>
>
>
>
>
>      bool
>      is_open()
>      { return _M_filebuf.is_open(); }
>
>
>
>      bool
>      is_open() const
>      { return _M_filebuf.is_open(); }
># 624 "/usr/include/c++/8/fstream" 3
>      void
>      open(const char* __s, ios_base::openmode __mode = ios_base::in)
>      {
> if (!_M_filebuf.open(__s, __mode | ios_base::in))
>   this->setstate(ios_base::failbit);
> else
>
>
>   this->clear();
>      }
># 644 "/usr/include/c++/8/fstream" 3
>      void
>      open(const std::string& __s, ios_base::openmode __mode = ios_base::in)
>      {
> if (!_M_filebuf.open(__s, __mode | ios_base::in))
>   this->setstate(ios_base::failbit);
> else
>
>
>   this->clear();
>      }
># 677 "/usr/include/c++/8/fstream" 3
>      void
>      close()
>      {
> if (!_M_filebuf.close())
>   this->setstate(ios_base::failbit);
>      }
>    };
># 700 "/usr/include/c++/8/fstream" 3
>  template<typename _CharT, typename _Traits>
>    class basic_ofstream : public basic_ostream<_CharT,_Traits>
>    {
>    public:
>
>      typedef _CharT char_type;
>      typedef _Traits traits_type;
>      typedef typename traits_type::int_type int_type;
>      typedef typename traits_type::pos_type pos_type;
>      typedef typename traits_type::off_type off_type;
>
>
>      typedef basic_filebuf<char_type, traits_type> __filebuf_type;
>      typedef basic_ostream<char_type, traits_type> __ostream_type;
>
>    private:
>      __filebuf_type _M_filebuf;
>
>    public:
># 727 "/usr/include/c++/8/fstream" 3
>      basic_ofstream(): __ostream_type(), _M_filebuf()
>      { this->init(&_M_filebuf); }
># 737 "/usr/include/c++/8/fstream" 3
>      explicit
>      basic_ofstream(const char* __s,
>       ios_base::openmode __mode = ios_base::out)
>      : __ostream_type(), _M_filebuf()
>      {
> this->init(&_M_filebuf);
> this->open(__s, __mode);
>      }
># 754 "/usr/include/c++/8/fstream" 3
>      explicit
>      basic_ofstream(const std::string& __s,
>       ios_base::openmode __mode = ios_base::out)
>      : __ostream_type(), _M_filebuf()
>      {
> this->init(&_M_filebuf);
> this->open(__s, __mode);
>      }
># 778 "/usr/include/c++/8/fstream" 3
>      basic_ofstream(const basic_ofstream&) = delete;
>
>      basic_ofstream(basic_ofstream&& __rhs)
>      : __ostream_type(std::move(__rhs)),
>      _M_filebuf(std::move(__rhs._M_filebuf))
>      { __ostream_type::set_rdbuf(&_M_filebuf); }
># 792 "/usr/include/c++/8/fstream" 3
>      ~basic_ofstream()
>      { }
>
>
>
>
>      basic_ofstream&
>      operator=(const basic_ofstream&) = delete;
>
>      basic_ofstream&
>      operator=(basic_ofstream&& __rhs)
>      {
> __ostream_type::operator=(std::move(__rhs));
> _M_filebuf = std::move(__rhs._M_filebuf);
> return *this;
>      }
>
>      void
>      swap(basic_ofstream& __rhs)
>      {
> __ostream_type::swap(__rhs);
> _M_filebuf.swap(__rhs._M_filebuf);
>      }
># 824 "/usr/include/c++/8/fstream" 3
>      __filebuf_type*
>      rdbuf() const
>      { return const_cast<__filebuf_type*>(&_M_filebuf); }
>
>
>
>
>
>      bool
>      is_open()
>      { return _M_filebuf.is_open(); }
>
>
>
>      bool
>      is_open() const
>      { return _M_filebuf.is_open(); }
># 850 "/usr/include/c++/8/fstream" 3
>      void
>      open(const char* __s, ios_base::openmode __mode = ios_base::out)
>      {
> if (!_M_filebuf.open(__s, __mode | ios_base::out))
>   this->setstate(ios_base::failbit);
> else
>
>
>   this->clear();
>      }
># 870 "/usr/include/c++/8/fstream" 3
>      void
>      open(const std::string& __s, ios_base::openmode __mode = ios_base::out)
>      {
> if (!_M_filebuf.open(__s, __mode | ios_base::out))
>   this->setstate(ios_base::failbit);
> else
>
>
>   this->clear();
>      }
># 903 "/usr/include/c++/8/fstream" 3
>      void
>      close()
>      {
> if (!_M_filebuf.close())
>   this->setstate(ios_base::failbit);
>      }
>    };
># 926 "/usr/include/c++/8/fstream" 3
>  template<typename _CharT, typename _Traits>
>    class basic_fstream : public basic_iostream<_CharT, _Traits>
>    {
>    public:
>
>      typedef _CharT char_type;
>      typedef _Traits traits_type;
>      typedef typename traits_type::int_type int_type;
>      typedef typename traits_type::pos_type pos_type;
>      typedef typename traits_type::off_type off_type;
>
>
>      typedef basic_filebuf<char_type, traits_type> __filebuf_type;
>      typedef basic_ios<char_type, traits_type> __ios_type;
>      typedef basic_iostream<char_type, traits_type> __iostream_type;
>
>    private:
>      __filebuf_type _M_filebuf;
>
>    public:
># 954 "/usr/include/c++/8/fstream" 3
>      basic_fstream()
>      : __iostream_type(), _M_filebuf()
>      { this->init(&_M_filebuf); }
>
>
>
>
>
>
>      explicit
>      basic_fstream(const char* __s,
>      ios_base::openmode __mode = ios_base::in | ios_base::out)
>      : __iostream_type(0), _M_filebuf()
>      {
> this->init(&_M_filebuf);
> this->open(__s, __mode);
>      }
>
>
>
>
>
>
>
>      explicit
>      basic_fstream(const std::string& __s,
>      ios_base::openmode __mode = ios_base::in | ios_base::out)
>      : __iostream_type(0), _M_filebuf()
>      {
> this->init(&_M_filebuf);
> this->open(__s, __mode);
>      }
># 1000 "/usr/include/c++/8/fstream" 3
>      basic_fstream(const basic_fstream&) = delete;
>
>      basic_fstream(basic_fstream&& __rhs)
>      : __iostream_type(std::move(__rhs)),
>      _M_filebuf(std::move(__rhs._M_filebuf))
>      { __iostream_type::set_rdbuf(&_M_filebuf); }
># 1014 "/usr/include/c++/8/fstream" 3
>      ~basic_fstream()
>      { }
>
>
>
>
>      basic_fstream&
>      operator=(const basic_fstream&) = delete;
>
>      basic_fstream&
>      operator=(basic_fstream&& __rhs)
>      {
> __iostream_type::operator=(std::move(__rhs));
> _M_filebuf = std::move(__rhs._M_filebuf);
> return *this;
>      }
>
>      void
>      swap(basic_fstream& __rhs)
>      {
> __iostream_type::swap(__rhs);
> _M_filebuf.swap(__rhs._M_filebuf);
>      }
># 1046 "/usr/include/c++/8/fstream" 3
>      __filebuf_type*
>      rdbuf() const
>      { return const_cast<__filebuf_type*>(&_M_filebuf); }
>
>
>
>
>
>      bool
>      is_open()
>      { return _M_filebuf.is_open(); }
>
>
>
>      bool
>      is_open() const
>      { return _M_filebuf.is_open(); }
># 1072 "/usr/include/c++/8/fstream" 3
>      void
>      open(const char* __s,
>    ios_base::openmode __mode = ios_base::in | ios_base::out)
>      {
> if (!_M_filebuf.open(__s, __mode))
>   this->setstate(ios_base::failbit);
> else
>
>
>   this->clear();
>      }
># 1093 "/usr/include/c++/8/fstream" 3
>      void
>      open(const std::string& __s,
>    ios_base::openmode __mode = ios_base::in | ios_base::out)
>      {
> if (!_M_filebuf.open(__s, __mode))
>   this->setstate(ios_base::failbit);
> else
>
>
>   this->clear();
>      }
># 1128 "/usr/include/c++/8/fstream" 3
>      void
>      close()
>      {
> if (!_M_filebuf.close())
>   this->setstate(ios_base::failbit);
>      }
>    };
>
>
>
>  template <class _CharT, class _Traits>
>    inline void
>    swap(basic_filebuf<_CharT, _Traits>& __x,
>  basic_filebuf<_CharT, _Traits>& __y)
>    { __x.swap(__y); }
>
>
>  template <class _CharT, class _Traits>
>    inline void
>    swap(basic_ifstream<_CharT, _Traits>& __x,
>  basic_ifstream<_CharT, _Traits>& __y)
>    { __x.swap(__y); }
>
>
>  template <class _CharT, class _Traits>
>    inline void
>    swap(basic_ofstream<_CharT, _Traits>& __x,
>  basic_ofstream<_CharT, _Traits>& __y)
>    { __x.swap(__y); }
>
>
>  template <class _CharT, class _Traits>
>    inline void
>    swap(basic_fstream<_CharT, _Traits>& __x,
>  basic_fstream<_CharT, _Traits>& __y)
>    { __x.swap(__y); }
>
>
>
>}
>
># 1 "/usr/include/c++/8/bits/fstream.tcc" 1 3
># 37 "/usr/include/c++/8/bits/fstream.tcc" 3
>       
># 38 "/usr/include/c++/8/bits/fstream.tcc" 3
>
>
>
>
>namespace std __attribute__ ((__visibility__ ("default")))
>{
>
>
>  template<typename _CharT, typename _Traits>
>    void
>    basic_filebuf<_CharT, _Traits>::
>    _M_allocate_internal_buffer()
>    {
>
>
>      if (!_M_buf_allocated && !_M_buf)
> {
>   _M_buf = new char_type[_M_buf_size];
>   _M_buf_allocated = true;
> }
>    }
>
>  template<typename _CharT, typename _Traits>
>    void
>    basic_filebuf<_CharT, _Traits>::
>    _M_destroy_internal_buffer() throw()
>    {
>      if (_M_buf_allocated)
> {
>   delete [] _M_buf;
>   _M_buf = 0;
>   _M_buf_allocated = false;
> }
>      delete [] _M_ext_buf;
>      _M_ext_buf = 0;
>      _M_ext_buf_size = 0;
>      _M_ext_next = 0;
>      _M_ext_end = 0;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_filebuf<_CharT, _Traits>::
>    basic_filebuf() : __streambuf_type(), _M_lock(), _M_file(&_M_lock),
>    _M_mode(ios_base::openmode(0)), _M_state_beg(), _M_state_cur(),
>    _M_state_last(), _M_buf(0), _M_buf_size(8192),
>    _M_buf_allocated(false), _M_reading(false), _M_writing(false), _M_pback(),
>    _M_pback_cur_save(0), _M_pback_end_save(0), _M_pback_init(false),
>    _M_codecvt(0), _M_ext_buf(0), _M_ext_buf_size(0), _M_ext_next(0),
>    _M_ext_end(0)
>    {
>      if (has_facet<__codecvt_type>(this->_M_buf_locale))
> _M_codecvt = &use_facet<__codecvt_type>(this->_M_buf_locale);
>    }
>
>
>  template<typename _CharT, typename _Traits>
>    basic_filebuf<_CharT, _Traits>::
>    basic_filebuf(basic_filebuf&& __rhs)
>    : __streambuf_type(__rhs),
>    _M_lock(), _M_file(std::move(__rhs._M_file), &_M_lock),
>    _M_mode(std::__exchange(__rhs._M_mode, ios_base::openmode(0))),
>    _M_state_beg(std::move(__rhs._M_state_beg)),
>    _M_state_cur(std::move(__rhs._M_state_cur)),
>    _M_state_last(std::move(__rhs._M_state_last)),
>    _M_buf(std::__exchange(__rhs._M_buf, nullptr)),
>    _M_buf_size(std::__exchange(__rhs._M_buf_size, 1)),
>    _M_buf_allocated(std::__exchange(__rhs._M_buf_allocated, false)),
>    _M_reading(std::__exchange(__rhs._M_reading, false)),
>    _M_writing(std::__exchange(__rhs._M_writing, false)),
>    _M_pback(__rhs._M_pback),
>    _M_pback_cur_save(std::__exchange(__rhs._M_pback_cur_save, nullptr)),
>    _M_pback_end_save(std::__exchange(__rhs._M_pback_end_save, nullptr)),
>    _M_pback_init(std::__exchange(__rhs._M_pback_init, false)),
>    _M_codecvt(__rhs._M_codecvt),
>    _M_ext_buf(std::__exchange(__rhs._M_ext_buf, nullptr)),
>    _M_ext_buf_size(std::__exchange(__rhs._M_ext_buf_size, 0)),
>    _M_ext_next(std::__exchange(__rhs._M_ext_next, nullptr)),
>    _M_ext_end(std::__exchange(__rhs._M_ext_end, nullptr))
>    {
>      __rhs._M_set_buffer(-1);
>      __rhs._M_state_last = __rhs._M_state_cur = __rhs._M_state_beg;
>    }
>
>  template<typename _CharT, typename _Traits>
>    basic_filebuf<_CharT, _Traits>&
>    basic_filebuf<_CharT, _Traits>::
>    operator=(basic_filebuf&& __rhs)
>    {
>      this->close();
>      __streambuf_type::operator=(__rhs);
>      _M_file.swap(__rhs._M_file);
>      _M_mode = std::__exchange(__rhs._M_mode, ios_base::openmode(0));
>      _M_state_beg = std::move(__rhs._M_state_beg);
>      _M_state_cur = std::move(__rhs._M_state_cur);
>      _M_state_last = std::move(__rhs._M_state_last);
>      _M_buf = std::__exchange(__rhs._M_buf, nullptr);
>      _M_buf_size = std::__exchange(__rhs._M_buf_size, 1);
>      _M_buf_allocated = std::__exchange(__rhs._M_buf_allocated, false);
>      _M_ext_buf = std::__exchange(__rhs._M_ext_buf, nullptr);
>      _M_ext_buf_size = std::__exchange(__rhs._M_ext_buf_size, 0);
>      _M_ext_next = std::__exchange(__rhs._M_ext_next, nullptr);
>      _M_ext_end = std::__exchange(__rhs._M_ext_end, nullptr);
>      _M_reading = std::__exchange(__rhs._M_reading, false);
>      _M_writing = std::__exchange(__rhs._M_writing, false);
>      _M_pback_cur_save = std::__exchange(__rhs._M_pback_cur_save, nullptr);
>      _M_pback_end_save = std::__exchange(__rhs._M_pback_end_save, nullptr);
>      _M_pback_init = std::__exchange(__rhs._M_pback_init, false);
>      __rhs._M_set_buffer(-1);
>      __rhs._M_state_last = __rhs._M_state_cur = __rhs._M_state_beg;
>      return *this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    void
>    basic_filebuf<_CharT, _Traits>::
>    swap(basic_filebuf& __rhs)
>    {
>      __streambuf_type::swap(__rhs);
>      _M_file.swap(__rhs._M_file);
>      std::swap(_M_mode, __rhs._M_mode);
>      std::swap(_M_state_beg, __rhs._M_state_beg);
>      std::swap(_M_state_cur, __rhs._M_state_cur);
>      std::swap(_M_state_last, __rhs._M_state_last);
>      std::swap(_M_buf, __rhs._M_buf);
>      std::swap(_M_buf_size, __rhs._M_buf_size);
>      std::swap(_M_buf_allocated, __rhs._M_buf_allocated);
>      std::swap(_M_ext_buf, __rhs._M_ext_buf);
>      std::swap(_M_ext_buf_size, __rhs._M_ext_buf_size);
>      std::swap(_M_ext_next, __rhs._M_ext_next);
>      std::swap(_M_ext_end, __rhs._M_ext_end);
>      std::swap(_M_reading, __rhs._M_reading);
>      std::swap(_M_writing, __rhs._M_writing);
>      std::swap(_M_pback_cur_save, __rhs._M_pback_cur_save);
>      std::swap(_M_pback_end_save, __rhs._M_pback_end_save);
>      std::swap(_M_pback_init, __rhs._M_pback_init);
>    }
>
>
>  template<typename _CharT, typename _Traits>
>    typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
>    basic_filebuf<_CharT, _Traits>::
>    open(const char* __s, ios_base::openmode __mode)
>    {
>      __filebuf_type *__ret = 0;
>      if (!this->is_open())
> {
>   _M_file.open(__s, __mode);
>   if (this->is_open())
>     {
>       _M_allocate_internal_buffer();
>       _M_mode = __mode;
>
>
>       _M_reading = false;
>       _M_writing = false;
>       _M_set_buffer(-1);
>
>
>       _M_state_last = _M_state_cur = _M_state_beg;
>
>
>       if ((__mode & ios_base::ate)
>    && this->seekoff(0, ios_base::end, __mode)
>    == pos_type(off_type(-1)))
>  this->close();
>       else
>  __ret = this;
>     }
> }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
>    basic_filebuf<_CharT, _Traits>::
>    close()
>    {
>      if (!this->is_open())
> return 0;
>
>      bool __testfail = false;
>      {
>
> struct __close_sentry
> {
>   basic_filebuf *__fb;
>   __close_sentry (basic_filebuf *__fbi): __fb(__fbi) { }
>   ~__close_sentry ()
>   {
>     __fb->_M_mode = ios_base::openmode(0);
>     __fb->_M_pback_init = false;
>     __fb->_M_destroy_internal_buffer();
>     __fb->_M_reading = false;
>     __fb->_M_writing = false;
>     __fb->_M_set_buffer(-1);
>     __fb->_M_state_last = __fb->_M_state_cur = __fb->_M_state_beg;
>   }
> } __cs (this);
>
> try
>   {
>     if (!_M_terminate_output())
>       __testfail = true;
>   }
> catch(__cxxabiv1::__forced_unwind&)
>   {
>     _M_file.close();
>     throw;
>   }
> catch(...)
>   { __testfail = true; }
>      }
>
>      if (!_M_file.close())
> __testfail = true;
>
>      if (__testfail)
> return 0;
>      else
> return this;
>    }
>
>  template<typename _CharT, typename _Traits>
>    streamsize
>    basic_filebuf<_CharT, _Traits>::
>    showmanyc()
>    {
>      streamsize __ret = -1;
>      const bool __testin = _M_mode & ios_base::in;
>      if (__testin && this->is_open())
> {
>
>
>   __ret = this->egptr() - this->gptr();
>
>
>
>
>
>
>
>   if (__check_facet(_M_codecvt).encoding() >= 0)
>
>     __ret += _M_file.showmanyc() / _M_codecvt->max_length();
> }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    typename basic_filebuf<_CharT, _Traits>::int_type
>    basic_filebuf<_CharT, _Traits>::
>    underflow()
>    {
>      int_type __ret = traits_type::eof();
>      const bool __testin = _M_mode & ios_base::in;
>      if (__testin)
> {
>   if (_M_writing)
>     {
>       if (overflow() == traits_type::eof())
>  return __ret;
>       _M_set_buffer(-1);
>       _M_writing = false;
>     }
>
>
>
>   _M_destroy_pback();
>
>   if (this->gptr() < this->egptr())
>     return traits_type::to_int_type(*this->gptr());
>
>
>   const size_t __buflen = _M_buf_size > 1 ? _M_buf_size - 1 : 1;
>
>
>   bool __got_eof = false;
>
>   streamsize __ilen = 0;
>   codecvt_base::result __r = codecvt_base::ok;
>   if (__check_facet(_M_codecvt).always_noconv())
>     {
>       __ilen = _M_file.xsgetn(reinterpret_cast<char*>(this->eback()),
>          __buflen);
>       if (__ilen == 0)
>  __got_eof = true;
>     }
>   else
>     {
>
>
>       const int __enc = _M_codecvt->encoding();
>       streamsize __blen;
>       streamsize __rlen;
>       if (__enc > 0)
>  __blen = __rlen = __buflen * __enc;
>       else
>  {
>    __blen = __buflen + _M_codecvt->max_length() - 1;
>    __rlen = __buflen;
>  }
>       const streamsize __remainder = _M_ext_end - _M_ext_next;
>       __rlen = __rlen > __remainder ? __rlen - __remainder : 0;
>
>
>
>       if (_M_reading && this->egptr() == this->eback() && __remainder)
>  __rlen = 0;
>
>
>
>       if (_M_ext_buf_size < __blen)
>  {
>    char* __buf = new char[__blen];
>    if (__remainder)
>      __builtin_memcpy(__buf, _M_ext_next, __remainder);
>
>    delete [] _M_ext_buf;
>    _M_ext_buf = __buf;
>    _M_ext_buf_size = __blen;
>  }
>       else if (__remainder)
>  __builtin_memmove(_M_ext_buf, _M_ext_next, __remainder);
>
>       _M_ext_next = _M_ext_buf;
>       _M_ext_end = _M_ext_buf + __remainder;
>       _M_state_last = _M_state_cur;
>
>       do
>  {
>    if (__rlen > 0)
>      {
>
>
>
>        if (_M_ext_end - _M_ext_buf + __rlen > _M_ext_buf_size)
>   {
>     __throw_ios_failure(("basic_filebuf::underflow " "codecvt::max_length() " "is not valid")
>
>                          );
>   }
>        streamsize __elen = _M_file.xsgetn(_M_ext_end, __rlen);
>        if (__elen == 0)
>   __got_eof = true;
>        else if (__elen == -1)
>   break;
>        _M_ext_end += __elen;
>      }
>
>    char_type* __iend = this->eback();
>    if (_M_ext_next < _M_ext_end)
>      __r = _M_codecvt->in(_M_state_cur, _M_ext_next,
>      _M_ext_end, _M_ext_next,
>      this->eback(),
>      this->eback() + __buflen, __iend);
>    if (__r == codecvt_base::noconv)
>      {
>        size_t __avail = _M_ext_end - _M_ext_buf;
>        __ilen = std::min(__avail, __buflen);
>        traits_type::copy(this->eback(),
>     reinterpret_cast<char_type*>
>     (_M_ext_buf), __ilen);
>        _M_ext_next = _M_ext_buf + __ilen;
>      }
>    else
>      __ilen = __iend - this->eback();
>
>
>
>
>    if (__r == codecvt_base::error)
>      break;
>
>    __rlen = 1;
>  }
>       while (__ilen == 0 && !__got_eof);
>     }
>
>   if (__ilen > 0)
>     {
>       _M_set_buffer(__ilen);
>       _M_reading = true;
>       __ret = traits_type::to_int_type(*this->gptr());
>     }
>   else if (__got_eof)
>     {
>
>
>
>       _M_set_buffer(-1);
>       _M_reading = false;
>
>
>       if (__r == codecvt_base::partial)
>  __throw_ios_failure(("basic_filebuf::underflow " "incomplete character in file")
>                                       );
>     }
>   else if (__r == codecvt_base::error)
>     __throw_ios_failure(("basic_filebuf::underflow " "invalid byte sequence in file")
>                                    );
>   else
>     __throw_ios_failure(("basic_filebuf::underflow " "error reading the file")
>                             );
> }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    typename basic_filebuf<_CharT, _Traits>::int_type
>    basic_filebuf<_CharT, _Traits>::
>    pbackfail(int_type __i)
>    {
>      int_type __ret = traits_type::eof();
>      const bool __testin = _M_mode & ios_base::in;
>      if (__testin)
> {
>   if (_M_writing)
>     {
>       if (overflow() == traits_type::eof())
>  return __ret;
>       _M_set_buffer(-1);
>       _M_writing = false;
>     }
>
>
>   const bool __testpb = _M_pback_init;
>   const bool __testeof = traits_type::eq_int_type(__i, __ret);
>   int_type __tmp;
>   if (this->eback() < this->gptr())
>     {
>       this->gbump(-1);
>       __tmp = traits_type::to_int_type(*this->gptr());
>     }
>   else if (this->seekoff(-1, ios_base::cur) != pos_type(off_type(-1)))
>     {
>       __tmp = this->underflow();
>       if (traits_type::eq_int_type(__tmp, __ret))
>  return __ret;
>     }
>   else
>     {
>
>
>
>
>
>       return __ret;
>     }
>
>
>
>   if (!__testeof && traits_type::eq_int_type(__i, __tmp))
>     __ret = __i;
>   else if (__testeof)
>     __ret = traits_type::not_eof(__i);
>   else if (!__testpb)
>     {
>       _M_create_pback();
>       _M_reading = true;
>       *this->gptr() = traits_type::to_char_type(__i);
>       __ret = __i;
>     }
> }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    typename basic_filebuf<_CharT, _Traits>::int_type
>    basic_filebuf<_CharT, _Traits>::
>    overflow(int_type __c)
>    {
>      int_type __ret = traits_type::eof();
>      const bool __testeof = traits_type::eq_int_type(__c, __ret);
>      const bool __testout = (_M_mode & ios_base::out
>         || _M_mode & ios_base::app);
>      if (__testout)
> {
>          if (_M_reading)
>            {
>              _M_destroy_pback();
>              const int __gptr_off = _M_get_ext_pos(_M_state_last);
>              if (_M_seek(__gptr_off, ios_base::cur, _M_state_last)
>                  == pos_type(off_type(-1)))
>                return __ret;
>            }
>   if (this->pbase() < this->pptr())
>     {
>
>       if (!__testeof)
>  {
>    *this->pptr() = traits_type::to_char_type(__c);
>    this->pbump(1);
>  }
>
>
>
>       if (_M_convert_to_external(this->pbase(),
>      this->pptr() - this->pbase()))
>  {
>    _M_set_buffer(0);
>    __ret = traits_type::not_eof(__c);
>  }
>     }
>   else if (_M_buf_size > 1)
>     {
>
>
>
>       _M_set_buffer(0);
>       _M_writing = true;
>       if (!__testeof)
>  {
>    *this->pptr() = traits_type::to_char_type(__c);
>    this->pbump(1);
>  }
>       __ret = traits_type::not_eof(__c);
>     }
>   else
>     {
>
>       char_type __conv = traits_type::to_char_type(__c);
>       if (__testeof || _M_convert_to_external(&__conv, 1))
>  {
>    _M_writing = true;
>    __ret = traits_type::not_eof(__c);
>  }
>     }
> }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    bool
>    basic_filebuf<_CharT, _Traits>::
>    _M_convert_to_external(_CharT* __ibuf, streamsize __ilen)
>    {
>
>      streamsize __elen;
>      streamsize __plen;
>      if (__check_facet(_M_codecvt).always_noconv())
> {
>   __elen = _M_file.xsputn(reinterpret_cast<char*>(__ibuf), __ilen);
>   __plen = __ilen;
> }
>      else
> {
>
>
>   streamsize __blen = __ilen * _M_codecvt->max_length();
>   char* __buf = static_cast<char*>(__builtin_alloca(__blen));
>
>   char* __bend;
>   const char_type* __iend;
>   codecvt_base::result __r;
>   __r = _M_codecvt->out(_M_state_cur, __ibuf, __ibuf + __ilen,
>    __iend, __buf, __buf + __blen, __bend);
>
>   if (__r == codecvt_base::ok || __r == codecvt_base::partial)
>     __blen = __bend - __buf;
>   else if (__r == codecvt_base::noconv)
>     {
>
>       __buf = reinterpret_cast<char*>(__ibuf);
>       __blen = __ilen;
>     }
>   else
>     __throw_ios_failure(("basic_filebuf::_M_convert_to_external " "conversion error")
>                           );
>
>   __elen = _M_file.xsputn(__buf, __blen);
>   __plen = __blen;
>
>
>   if (__r == codecvt_base::partial && __elen == __plen)
>     {
>       const char_type* __iresume = __iend;
>       streamsize __rlen = this->pptr() - __iend;
>       __r = _M_codecvt->out(_M_state_cur, __iresume,
>        __iresume + __rlen, __iend, __buf,
>        __buf + __blen, __bend);
>       if (__r != codecvt_base::error)
>  {
>    __rlen = __bend - __buf;
>    __elen = _M_file.xsputn(__buf, __rlen);
>    __plen = __rlen;
>  }
>       else
>  __throw_ios_failure(("basic_filebuf::_M_convert_to_external " "conversion error")
>                        );
>     }
> }
>      return __elen == __plen;
>    }
>
>  template<typename _CharT, typename _Traits>
>    streamsize
>    basic_filebuf<_CharT, _Traits>::
>    xsgetn(_CharT* __s, streamsize __n)
>    {
>
>      streamsize __ret = 0;
>      if (_M_pback_init)
> {
>   if (__n > 0 && this->gptr() == this->eback())
>     {
>       *__s++ = *this->gptr();
>       this->gbump(1);
>       __ret = 1;
>       --__n;
>     }
>   _M_destroy_pback();
> }
>      else if (_M_writing)
> {
>   if (overflow() == traits_type::eof())
>     return __ret;
>   _M_set_buffer(-1);
>   _M_writing = false;
> }
>
>
>
>
>      const bool __testin = _M_mode & ios_base::in;
>      const streamsize __buflen = _M_buf_size > 1 ? _M_buf_size - 1 : 1;
>
>      if (__n > __buflen && __check_facet(_M_codecvt).always_noconv()
>   && __testin)
> {
>
>   const streamsize __avail = this->egptr() - this->gptr();
>   if (__avail != 0)
>     {
>       traits_type::copy(__s, this->gptr(), __avail);
>       __s += __avail;
>       this->setg(this->eback(), this->gptr() + __avail, this->egptr());
>       __ret += __avail;
>       __n -= __avail;
>     }
>
>
>
>   streamsize __len;
>   for (;;)
>     {
>       __len = _M_file.xsgetn(reinterpret_cast<char*>(__s), __n);
>       if (__len == -1)
>  __throw_ios_failure(("basic_filebuf::xsgetn " "error reading the file")
>                              );
>       if (__len == 0)
>  break;
>
>       __n -= __len;
>       __ret += __len;
>       if (__n == 0)
>  break;
>
>       __s += __len;
>     }
>
>   if (__n == 0)
>     {
>
>       _M_reading = true;
>     }
>   else if (__len == 0)
>     {
>
>
>
>       _M_set_buffer(-1);
>       _M_reading = false;
>     }
> }
>      else
> __ret += __streambuf_type::xsgetn(__s, __n);
>
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    streamsize
>    basic_filebuf<_CharT, _Traits>::
>    xsputn(const _CharT* __s, streamsize __n)
>    {
>      streamsize __ret = 0;
>
>
>
>      const bool __testout = (_M_mode & ios_base::out
>         || _M_mode & ios_base::app);
>      if (__check_facet(_M_codecvt).always_noconv()
>   && __testout && !_M_reading)
> {
>
>   const streamsize __chunk = 1ul << 10;
>   streamsize __bufavail = this->epptr() - this->pptr();
>
>
>   if (!_M_writing && _M_buf_size > 1)
>     __bufavail = _M_buf_size - 1;
>
>   const streamsize __limit = std::min(__chunk, __bufavail);
>   if (__n >= __limit)
>     {
>       const streamsize __buffill = this->pptr() - this->pbase();
>       const char* __buf = reinterpret_cast<const char*>(this->pbase());
>       __ret = _M_file.xsputn_2(__buf, __buffill,
>           reinterpret_cast<const char*>(__s),
>           __n);
>       if (__ret == __buffill + __n)
>  {
>    _M_set_buffer(0);
>    _M_writing = true;
>  }
>       if (__ret > __buffill)
>  __ret -= __buffill;
>       else
>  __ret = 0;
>     }
>   else
>     __ret = __streambuf_type::xsputn(__s, __n);
> }
>       else
>  __ret = __streambuf_type::xsputn(__s, __n);
>       return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    typename basic_filebuf<_CharT, _Traits>::__streambuf_type*
>    basic_filebuf<_CharT, _Traits>::
>    setbuf(char_type* __s, streamsize __n)
>    {
>      if (!this->is_open())
> {
>   if (__s == 0 && __n == 0)
>     _M_buf_size = 1;
>   else if (__s && __n > 0)
>     {
># 785 "/usr/include/c++/8/bits/fstream.tcc" 3
>       _M_buf = __s;
>       _M_buf_size = __n;
>     }
> }
>      return this;
>    }
>
>
>
>
>  template<typename _CharT, typename _Traits>
>    typename basic_filebuf<_CharT, _Traits>::pos_type
>    basic_filebuf<_CharT, _Traits>::
>    seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode)
>    {
>      int __width = 0;
>      if (_M_codecvt)
> __width = _M_codecvt->encoding();
>      if (__width < 0)
> __width = 0;
>
>      pos_type __ret = pos_type(off_type(-1));
>      const bool __testfail = __off != 0 && __width <= 0;
>      if (this->is_open() && !__testfail)
> {
>
>
>
>
>   bool __no_movement = __way == ios_base::cur && __off == 0
>     && (!_M_writing || _M_codecvt->always_noconv());
>
>
>   if (!__no_movement)
>     _M_destroy_pback();
>
>
>
>
>
>
>   __state_type __state = _M_state_beg;
>   off_type __computed_off = __off * __width;
>   if (_M_reading && __way == ios_base::cur)
>     {
>       __state = _M_state_last;
>       __computed_off += _M_get_ext_pos(__state);
>     }
>   if (!__no_movement)
>     __ret = _M_seek(__computed_off, __way, __state);
>   else
>     {
>       if (_M_writing)
>  __computed_off = this->pptr() - this->pbase();
>
>       off_type __file_off = _M_file.seekoff(0, ios_base::cur);
>       if (__file_off != off_type(-1))
>  {
>    __ret = __file_off + __computed_off;
>    __ret.state(__state);
>  }
>     }
> }
>      return __ret;
>    }
>
>
>
>
>
>  template<typename _CharT, typename _Traits>
>    typename basic_filebuf<_CharT, _Traits>::pos_type
>    basic_filebuf<_CharT, _Traits>::
>    seekpos(pos_type __pos, ios_base::openmode)
>    {
>      pos_type __ret = pos_type(off_type(-1));
>      if (this->is_open())
> {
>
>   _M_destroy_pback();
>   __ret = _M_seek(off_type(__pos), ios_base::beg, __pos.state());
> }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    typename basic_filebuf<_CharT, _Traits>::pos_type
>    basic_filebuf<_CharT, _Traits>::
>    _M_seek(off_type __off, ios_base::seekdir __way, __state_type __state)
>    {
>      pos_type __ret = pos_type(off_type(-1));
>      if (_M_terminate_output())
> {
>   off_type __file_off = _M_file.seekoff(__off, __way);
>   if (__file_off != off_type(-1))
>     {
>       _M_reading = false;
>       _M_writing = false;
>       _M_ext_next = _M_ext_end = _M_ext_buf;
>       _M_set_buffer(-1);
>       _M_state_cur = __state;
>       __ret = __file_off;
>       __ret.state(_M_state_cur);
>     }
> }
>      return __ret;
>    }
>
>
>
>
>  template<typename _CharT, typename _Traits>
>    int basic_filebuf<_CharT, _Traits>::
>    _M_get_ext_pos(__state_type& __state)
>    {
>      if (_M_codecvt->always_noconv())
>        return this->gptr() - this->egptr();
>      else
>        {
>
>
>
>          const int __gptr_off =
>            _M_codecvt->length(__state, _M_ext_buf, _M_ext_next,
>                               this->gptr() - this->eback());
>          return _M_ext_buf + __gptr_off - _M_ext_end;
>        }
>    }
>
>  template<typename _CharT, typename _Traits>
>    bool
>    basic_filebuf<_CharT, _Traits>::
>    _M_terminate_output()
>    {
>
>      bool __testvalid = true;
>      if (this->pbase() < this->pptr())
> {
>   const int_type __tmp = this->overflow();
>   if (traits_type::eq_int_type(__tmp, traits_type::eof()))
>     __testvalid = false;
> }
>
>
>      if (_M_writing && !__check_facet(_M_codecvt).always_noconv()
>   && __testvalid)
> {
>
>
>
>   const size_t __blen = 128;
>   char __buf[__blen];
>   codecvt_base::result __r;
>   streamsize __ilen = 0;
>
>   do
>     {
>       char* __next;
>       __r = _M_codecvt->unshift(_M_state_cur, __buf,
>     __buf + __blen, __next);
>       if (__r == codecvt_base::error)
>  __testvalid = false;
>       else if (__r == codecvt_base::ok ||
>         __r == codecvt_base::partial)
>  {
>    __ilen = __next - __buf;
>    if (__ilen > 0)
>      {
>        const streamsize __elen = _M_file.xsputn(__buf, __ilen);
>        if (__elen != __ilen)
>   __testvalid = false;
>      }
>  }
>     }
>   while (__r == codecvt_base::partial && __ilen > 0 && __testvalid);
>
>   if (__testvalid)
>     {
>
>
>
>
>       const int_type __tmp = this->overflow();
>       if (traits_type::eq_int_type(__tmp, traits_type::eof()))
>  __testvalid = false;
>     }
> }
>      return __testvalid;
>    }
>
>  template<typename _CharT, typename _Traits>
>    int
>    basic_filebuf<_CharT, _Traits>::
>    sync()
>    {
>
>
>      int __ret = 0;
>      if (this->pbase() < this->pptr())
> {
>   const int_type __tmp = this->overflow();
>   if (traits_type::eq_int_type(__tmp, traits_type::eof()))
>     __ret = -1;
> }
>      return __ret;
>    }
>
>  template<typename _CharT, typename _Traits>
>    void
>    basic_filebuf<_CharT, _Traits>::
>    imbue(const locale& __loc)
>    {
>      bool __testvalid = true;
>
>      const __codecvt_type* _M_codecvt_tmp = 0;
>      if (__builtin_expect(has_facet<__codecvt_type>(__loc), true))
> _M_codecvt_tmp = &use_facet<__codecvt_type>(__loc);
>
>      if (this->is_open())
> {
>
>   if ((_M_reading || _M_writing)
>       && __check_facet(_M_codecvt).encoding() == -1)
>     __testvalid = false;
>   else
>     {
>       if (_M_reading)
>  {
>    if (__check_facet(_M_codecvt).always_noconv())
>      {
>        if (_M_codecvt_tmp
>     && !__check_facet(_M_codecvt_tmp).always_noconv())
>   __testvalid = this->seekoff(0, ios_base::cur, _M_mode)
>                 != pos_type(off_type(-1));
>      }
>    else
>      {
>
>        _M_ext_next = _M_ext_buf
>   + _M_codecvt->length(_M_state_last, _M_ext_buf,
>          _M_ext_next,
>          this->gptr() - this->eback());
>        const streamsize __remainder = _M_ext_end - _M_ext_next;
>        if (__remainder)
>   __builtin_memmove(_M_ext_buf, _M_ext_next, __remainder);
>
>        _M_ext_next = _M_ext_buf;
>        _M_ext_end = _M_ext_buf + __remainder;
>        _M_set_buffer(-1);
>        _M_state_last = _M_state_cur = _M_state_beg;
>      }
>  }
>       else if (_M_writing && (__testvalid = _M_terminate_output()))
>  _M_set_buffer(-1);
>     }
> }
>
>      if (__testvalid)
> _M_codecvt = _M_codecvt_tmp;
>      else
> _M_codecvt = 0;
>    }
>
>
>
>
>  extern template class basic_filebuf<char>;
>  extern template class basic_ifstream<char>;
>  extern template class basic_ofstream<char>;
>  extern template class basic_fstream<char>;
>
>
>  extern template class basic_filebuf<wchar_t>;
>  extern template class basic_ifstream<wchar_t>;
>  extern template class basic_ofstream<wchar_t>;
>  extern template class basic_fstream<wchar_t>;
>
>
>
>
>}
># 1170 "/usr/include/c++/8/fstream" 2 3
># 35 "/usr/include/c++/8/ext/stdio_filebuf.h" 2 3
>
>namespace __gnu_cxx __attribute__ ((__visibility__ ("default")))
>{
>
># 49 "/usr/include/c++/8/ext/stdio_filebuf.h" 3
>  template<typename _CharT, typename _Traits = std::char_traits<_CharT> >
>    class stdio_filebuf : public std::basic_filebuf<_CharT, _Traits>
>    {
>    public:
>
>      typedef _CharT char_type;
>      typedef _Traits traits_type;
>      typedef typename traits_type::int_type int_type;
>      typedef typename traits_type::pos_type pos_type;
>      typedef typename traits_type::off_type off_type;
>      typedef std::size_t size_t;
>
>    public:
>
>
>
>      stdio_filebuf() : std::basic_filebuf<_CharT, _Traits>() {}
># 77 "/usr/include/c++/8/ext/stdio_filebuf.h" 3
>      stdio_filebuf(int __fd, std::ios_base::openmode __mode,
>      size_t __size = static_cast<size_t>(8192));
># 90 "/usr/include/c++/8/ext/stdio_filebuf.h" 3
>      stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode,
>      size_t __size = static_cast<size_t>(8192));
>
>
>
>
>
>      virtual
>      ~stdio_filebuf();
>
>
>      stdio_filebuf(stdio_filebuf&&) = default;
>      stdio_filebuf& operator=(stdio_filebuf&&) = default;
>
>      void
>      swap(stdio_filebuf& __fb)
>      { std::basic_filebuf<_CharT, _Traits>::swap(__fb); }
># 117 "/usr/include/c++/8/ext/stdio_filebuf.h" 3
>      int
>      fd() { return this->_M_file.fd(); }
># 127 "/usr/include/c++/8/ext/stdio_filebuf.h" 3
>      std::__c_file*
>      file() { return this->_M_file.file(); }
>    };
>
>  template<typename _CharT, typename _Traits>
>    stdio_filebuf<_CharT, _Traits>::~stdio_filebuf()
>    { }
>
>  template<typename _CharT, typename _Traits>
>    stdio_filebuf<_CharT, _Traits>::
>    stdio_filebuf(int __fd, std::ios_base::openmode __mode, size_t __size)
>    {
>      this->_M_file.sys_open(__fd, __mode);
>      if (this->is_open())
> {
>   this->_M_mode = __mode;
>   this->_M_buf_size = __size;
>   this->_M_allocate_internal_buffer();
>   this->_M_reading = false;
>   this->_M_writing = false;
>   this->_M_set_buffer(-1);
> }
>    }
>
>  template<typename _CharT, typename _Traits>
>    stdio_filebuf<_CharT, _Traits>::
>    stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode,
>    size_t __size)
>    {
>      this->_M_file.sys_open(__f, __mode);
>      if (this->is_open())
> {
>   this->_M_mode = __mode;
>   this->_M_buf_size = __size;
>   this->_M_allocate_internal_buffer();
>   this->_M_reading = false;
>   this->_M_writing = false;
>   this->_M_set_buffer(-1);
> }
>    }
>
>
>}
># 2 "reproducer2.cxx" 2
>
>
># 3 "reproducer2.cxx"
>using namespace std;
>
>int main() {
>  __gnu_cxx::stdio_filebuf<char> fb;
>}

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Attachments on bug 1589382: 1450063 | 1450159