#include<cstdio>using　namespace　std;/*你也可以同时加上这个语句*/

//　-*-　C++　-*-　forwarding　header.//　Copyright　(C)　1997,　1998,　1999,　2000,　2001,　2002,　2003//　Free　Software　Foundation,　Inc.////　This　file　is　part　of　the　GNU　ISO　C++　Library.　This　library　is　free//　software;　you　can　redistribute　it　and/or　modify　it　under　the//　terms　of　the　GNU　General　Public　License　as　published　by　the//　Free　Software　Foundation;　either　version　2,　or　(at　your　option)//　any　later　version.//　This　library　is　distributed　in　the　hope　that　it　will　be　useful,//　but　WITHOUT　ANY　WARRANTY;　without　even　the　implied　warranty　of//　MERCHANTABILITY　or　FITNESS　FOR　A　PARTICULAR　PURPOSE.　See　the//　GNU　General　Public　License　for　more　details.//　You　should　have　received　a　copy　of　the　GNU　General　Public　License　along//　with　this　library;　see　the　file　COPYING.　If　not,　write　to　the　Free//　Software　Foundation,　59　Temple　Place　-　Suite　330,　Boston,　MA　02111-1307,//　USA.//　As　a　special　exception,　you　may　use　this　file　as　part　of　a　free　software//　library　without　restriction.　Specifically,　if　other　files　instantiate//　templates　or　use　macros　or　inline　functions　from　this　file,　or　you　compile//　this　file　and　link　it　with　other　files　to　produce　an　executable,　this//　file　does　not　by　itself　cause　the　resulting　executable　to　be　covered　by//　the　GNU　General　Public　License.　This　exception　does　not　however//　invalidate　any　other　reasons　why　the　executable　file　might　be　covered　by//　the　GNU　General　Public　License.////　ISO　C++　14882:　27.8.2　C　Library　files///**　@file　cstdio　*　This　is　a　Standard　C++　Library　file.　You　should　@c　#include　this　file　*　in　your　programs,　rather　than　any　of　the　"*.h"　implementation　files.　*　*　This　is　the　C++　version　of　the　Standard　C　Library　header　@cstdio.h,　*　and　its　contents　are　(mostly)　the　same　as　that　header,　but　are　all　*　contained　in　the　namespace　@cstd.　*/#ifndef　_GLIBCXX_CSTDIO#define　_GLIBCXX_CSTDIO　1#pragma GCC　system_header#include　<bits/c++config.h>#include　<cstddef>#include　<stdio.h>//　Get　rid　of　those　macros　defined　in　<stdio.h>　in　lieu　of　real　functions.#undef　clearerr#undef　fclose#undef　feof#undef　ferror#undef　fflush#undef　fgetc#undef　fgetpos#undef　fgets#undef　fopen#undef　fprintf#undef　fputc#undef　fputs#undef　fread#undef　freopen#undef　fscanf#undef　fseek#undef　fsetpos#undef　ftell#undef　fwrite#undef　getc#undef　getchar#undef　gets#undef　perror#undef　printf#undef　putc#undef　putchar#undef　puts#undef　remove#undef　rename#undef　rewind#undef　scanf#undef　setbuf#undef　setvbuf#undef　sprintf#undef　sscanf#undef　tmpfile#undef　tmpnam#undef　ungetc#undef　vfprintf#undef　vprintf#undef　vsprintfnamespace　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　::gets;　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;}#if　_GLIBCXX_USE_C99#undef　snprintf#undef　vfscanf#undef　vscanf#undef　vsnprintf#undef　vsscanfnamespace　__gnu_cxx{#if　_GLIBCXX_USE_C99_CHECK　||　_GLIBCXX_USE_C99_DYNAMIC　extern　"C"　int　(snprintf)(char　*　restrict,　size_t,　const　char　*　restrict,　...);　extern　"C"　int　(vfscanf)(FILE　*　restrict,　const　char　*　restrict,　__gnuc_va_list);　extern　"C"　int　(vscanf)(const　char　*　restrict,　__gnuc_va_list);　extern　"C"　int　(vsnprintf)(char　*　restrict,　size_t,　const　char　*　restrict,　__gnuc_va_list);　extern　"C"　int　(vsscanf)(const　char　*　restrict,　const　char　*　restrict,　__gnuc_va_list);#endif#if　!_GLIBCXX_USE_C99_DYNAMIC　using　::snprintf;　using　::vfscanf;　using　::vscanf;　using　::vsnprintf;　using　::vsscanf;#endif}namespace　std{　using　__gnu_cxx::snprintf;　using　__gnu_cxx::vfscanf;　using　__gnu_cxx::vscanf;　using　__gnu_cxx::vsnprintf;　using　__gnu_cxx::vsscanf;}#endif#endif/*为了便于查看使用了全形空格"　"*/