はじめに
AtCoderなどで他の人のコードを見ていると、よく #include < bits/stdc++.h > というものをよく見かける。
#include < iostream > とか、#include < string > とか書かなくて良くなるらしい。便利だから導入したいと思って調べるけど、これが全然見つからない！ひたすら検索していると、英語のサイトでやっと見つけたので貼っておきます。
環境
- Mac
- Atomエディタ
- 言語はC++
- g++でコンパイルしている
やり方
$ cd /usr/local/include
$ mkdir bits
$ cd bits
$ nano stdc++.h
bits/stdc++.h の中身は以下をコピペ
// 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
全て一括includeするという訳です。
おわりに
C++だけでなくC言語もincludeされています。
このおかげで私はまともにC言語を勉強する前にこの競プロに手を出してしまったのでC言語がよくわからないままC言語を使っていました。
.cppだと WA なのに .cだと AC だ！は？？？という状況に陥りました()
PythonよりもJavaよりも先に、最初に学ぶプログラミング言語はC++！なんて間違ってもしない方がいいですよ。
Macの動作環境で < bits/stdc++.h > の環境構築を紹介している日本語サイトは全部わかりずらかったので書いておきました。
参考になれば！