超级好用的C++万能头文件

#include<bits/stdc++.h>包含了目前c++所包含的所有头文件

对比：

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include using namespace std;

int main(){

return 0;

}

可以直接转化为：

#include<bits/stdc++.h>

using namespace std;

int main()

return 0;

}

兼容性问题：

注意，目前POJ还不支持<bits/stdc++.h>（G++、C++都不支持）。HDU部分支持（G++支持，C++不支持）。

其他国外的oj，还有台湾的oj都支持，CF，Topcoder也都支持。

当然，其实这是一个偷懒的写法，但是会降低编译速度（为何会降低编译速度，我还不能知道，等到之后学编译原理再来填坑吧）。

笔试平台可以使用，方便，VS中并不支持,一般G++ 4.4以上就支持这个头文件了。当然，私下自己学习就不要去使用了，对你的自主学习一点都没有好处。

c++11支持这个

po上<bits/stdc++.h>的源代码

// C++ includes used for precompiling -- C++ --

// Copyright © 2003-2014 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 #endif

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#if __cplusplus >= 201103L

#include

#include

#include

#include

#include

#include

#include

#include

#include #endif

// C++

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#if __cplusplus >= 201103L

#include

#include

#include

#include <condition_variable>

#include <forward_list>

#include

#include <initializer_list>

#include

#include

#include

#include

#include <scoped_allocator>

#include <system_error>

#include

#include

#include

#include <type_traits>

#include <unordered_map>

#include <unordered_set>#endif