•<bits/stdc++.h>介紹
#include<bits/stdc++.h> 包含了目前 C++ 所包含的所有標頭檔案，又稱萬能標頭檔案，簡直是開掛一般的存在。
你程式設計所需要的標頭檔案基本上都囊括在了該萬能標頭檔案中，試想一下，將若干行標頭檔案：
#include<iostream> #include<cstdio> #include<string> #include<map> #include<vector> ......只用一行程式碼 #include<bits/stdc++.h> 來代替，是不是簡單粗暴！
•如何在VS2022中使用萬能頭
可惜，這麼好的萬能頭，在VS2022中不能使用，難道就此放棄嗎？
不，作為21世紀有思想的時代青年，這點問題怎麼能難道我呢？
首先，找到你本地VS的安裝目錄，在VS中找到 include 資料夾，我的在該路徑上：
D:\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.31.31103\include
在 include 資料夾下建立一個 bits 資料夾，並新建一個 stdc++.h 的檔案，將如下程式碼複製到 stdc++.h 檔案中，即可在 VS2022 中使用萬能頭。
// C++ includes used for precompiling -*- C++ -*- // Copyright (C) 2003-2016 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 <cuchar> #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 <codecvt> #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 #if __cplusplus >= 201402L #include <shared_mutex> #endif
設定完成後，重啟 VS 即可愉悅的使用萬能頭了，完結撒花！
