C++ 中神奇的头文件，懒人专用

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今天在做题的时候，偶然发现了一种神奇头文件。他的使用方法以及内容如下：

#include <bits/stdc++.h>

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

 // Copyright (C) 2003-2013 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