在VS中使用#include <bits/stdc++.h>的方法

codeforces已经有过说明。我这里只是把它翻译地更加浅显一点：
solution to include bits/stdc++.h in visual c++

By Tensor, 2 years ago, ,
This is just a method i used to make me able to include bits/stdc++.h
in visual c++.
for those had minGW installed on PC :
C:\MinGW\mingw32\lib\gcc\mingw32\4.8.1\include\c++\mingw32\bits
copy this folder and then go to this adress
C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\include
paste your folder. go to your visual studio project type bits you will see
the auto-complete for the library and then choose stdc++.h
for those don’t have minGW:
you should write your own header file and include all libraries in it then
go to C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\include
make new folder name it “bits” and name the header file stdc++.h
then paste it in “bits” folder.
Hope this helps!
Happy coding

就是说
1.如果安装了MinGW的直接在文件夹里面找到bits这个文件夹（注意里面一定要包含stdc++.h，貌似我的版本有两个bits文件夹），把里面内容复制粘贴到vs的头文件库（一般是在c盘的安装目录）里面。
（2017.3.19修正，装VS2017时候找了好一会，已经不是在这个地方，应该是先找到VS主目录，然后往这里面找VS主要目录\VC\Tools\MSVC\14.10.25017\include）
2.如果没有安装MinGW，那么自己在vs的include文件夹里面新建一个bits文件夹，里面新建一个名叫stdc++.h的头文件，里面写你常用的头文件，这里我搬运一下stdc++.h源文件：

// C++ includes used for precompiling -*- C++ -*-  // Copyright (C) 2003-2015 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 3, 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.  // Under Section 7 of GPL version 3, you are granted additional  // permissions described in the GCC Runtime Library Exception, version  // 3.1, as published by the Free Software Foundation.  // You should have received a copy of the GNU General Public License and  // a copy of the GCC Runtime Library Exception along with this program;  // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see  // <http://www.gnu.org/licenses/>.  /** @file stdc++.h  *  This is an implementation file for a precompiled header.  */  // 17.4.1.2 Headers  // C  #ifndef _GLIBCXX_NO_ASSERT  #include <cassert>  #endif  #include <cctype>  #include <cerrno>  #include <cfloat>  #include <ciso646>  #include <climits>  #include <clocale>  #include <cmath>  #include <csetjmp>  #include <csignal>  #include <cstdarg>  #include <cstddef>  #include <cstdio>  #include <cstdlib>  #include <cstring>  #include <ctime>  #if __cplusplus >= 201103L  #include <ccomplex>  #include <cfenv>  #include <cinttypes>  #include <cstdalign>  #include <cstdbool>  #include <cstdint>  #include <ctgmath>  #include <cwchar>  #include <cwctype>  #endif  // C++  #include <algorithm>  #include <bitset>  #include <complex>  #include <deque>  #include <exception>  #include <fstream>  #include <functional>  #include <iomanip>  #include <ios>  #include <iosfwd>  #include <iostream>  #include <istream>  #include <iterator>  #include <limits>  #include <list>  #include <locale>  #include <map>  #include <memory>  #include <new>  #include <numeric>  #include <ostream>  #include <queue>  #include <set>  #include <sstream>  #include <stack>  #include <stdexcept>  #include <streambuf>  #include <string>  #include <typeinfo>  #include <utility>  #include <valarray>  #include <vector>  #if __cplusplus >= 201103L  #include <array>  #include <atomic>  #include <chrono>  #include <condition_variable>  #include <forward_list>  #include <future>  #include <initializer_list>  #include <mutex>  #include <random>  #include <ratio>  #include <regex>  #include <scoped_allocator>  #include <system_error>  #include <thread>  #include <tuple>  #include <typeindex>  #include <type_traits>  #include <unordered_map>  #include <unordered_set>  #endif