手动添加VS2019万能头bits/stdc++.h（超基础奥）

首先介绍一下bits/stdc++.h~

  估计很多小伙伴看代码会碰见没有多余的其它头文件比如cmath、iostream而是只用了一行#include这样的头文件而感到诧异，想这是什么东东。其实这是一个包含了C++所有头文件的头文件，为了使用方便而发明的，其中包含了以下头文件：

#include   
#include   
#include   
#include   
#include   
#include   
#include   
#include   
#include   
#include   
#include 

　　对于刷leetcode的小伙伴就不用担心这个问题啦，对于一些传统的OJ平台，大家可以尝试着去使用。再贴一下 bits/stdc++.h的源代码。

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

// Copyright (C) 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
// .

/** @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 

手动添加万能头的步骤如下

　　看到万能头就仿佛开启了新世界（也有缺点，就是导致编译速度变慢，不过一般可以忽略不计），但是当我想用它时却发现：

　　看来要手动添加喽【如果安装了MinGW的直接在文件夹里面找到bits这个文件夹，把里面内容复制粘贴到vs的头文件库里面】

　　如果没有安装MinGW，那就跟着我来做以下步骤：

　1.新建txt文档，把以下代码（stdc++.h源码,上面已经介绍过辽~）复制进去：

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

// Copyright (C) 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
// .

/** @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 

　2.把txt文档改名stdc++.h

　3.打开vs2019的安装目录，右上角搜索MSCV（一般会搜到两个MSVC，可以自己打开看一下哪个有include文件夹），然后打开这个MSVC文件夹:

　依次打开文件夹“14.15.26726”>>“include”。

　在“include”目录下新建文件夹“bits”，然后把刚才的bits/stdc++.h移入。

　4. 大功告成

【 注意最后需要重启VS奥！！！】

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　　永远走在充满鲜花的路上吧！加油鸭~

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