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一、总结一句话总结:1、bits/stdc++.h是部分C++中支持的一个几乎万能的头文件,包含所有的可用到的C++库函数,如<istream>/<ostream>/<stack>/<queue>等.2、原理是在这个文件中包含了其它的头文件// 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 // <Licenses - GNU Project - Free Software Foundation>. /** @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
二、C++ 中头文件<bits/stdc++.h>的优缺点转自或参考:C++ 中头文件<bits/stdc++.h>的优缺点 在编程竞赛中,我们常见一个头文件: #include <bits/stdc++.h> 发现它是部分C++中支持的一个几乎万能的头文件,包含所有的可用到的C++库函数,如<istream>/<ostream>/<stack>/<queue>. 该头文件的详细内容如下: 1 // C++ includes used for precompiling -*- C++ -*- 2 3 // Copyright (C) 2003-2013 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <Licenses - GNU Project - Free Software Foundation>. 24 25 /** @file stdc++.h 26 * This is an implementation file for a precompiled header. 27 */ 28 29 // 17.4.1.2 Headers 30 31 // C 32 #ifndef _GLIBCXX_NO_ASSERT 33 #include <cassert> 34 #endif 35 #include <cctype> 36 #include <cerrno> 37 #include <cfloat> 38 #include <ciso646> 39 #include <climits> 40 #include <clocale> 41 #include <cmath> 42 #include <csetjmp> 43 #include <csignal> 44 #include <cstdarg> 45 #include <cstddef> 46 #include <cstdio> 47 #include <cstdlib> 48 #include <cstring> 49 #include <ctime> 50 51 #if __cplusplus >= 201103L 52 #include <ccomplex> 53 #include <cfenv> 54 #include <cinttypes> 55 #include <cstdalign> 56 #include <cstdbool> 57 #include <cstdint> 58 #include <ctgmath> 59 #include <cwchar> 60 #include <cwctype> 61 #endif 62 63 // C++ 64 #include <algorithm> 65 #include <bitset> 66 #include <complex> 67 #include <deque> 68 #include <exception> 69 #include <fstream> 70 #include <functional> 71 #include <iomanip> 72 #include <ios> 73 #include <iosfwd> 74 #include <iostream> 75 #include <istream> 76 #include <iterator> 77 #include <limits> 78 #include <list> 79 #include <locale> 80 #include <map> 81 #include <memory> 82 #include <new> 83 #include <numeric> 84 #include <ostream> 85 #include <queue> 86 #include <set> 87 #include <sstream> 88 #include <stack> 89 #include <stdexcept> 90 #include <streambuf> 91 #include <string> 92 #include <typeinfo> 93 #include <utility> 94 #include <valarray> 95 #include <vector> 96 97 #if __cplusplus >= 201103L 98 #include <array> 99 #include <atomic> 100 #include <chrono> 101 #include <condition_variable> 102 #include <forward_list> 103 #include <future> 104 #include <initializer_list> 105 #include <mutex> 106 #include <random> 107 #include <ratio> 108 #include <regex> 109 #include <scoped_allocator> 110 #include <system_error> 111 #include <thread> 112 #include <tuple> 113 #include <typeindex> 114 #include <type_traits> 115 #include <unordered_map> 116 #include <unordered_set> 117 #endif 在编程竞赛中,使用这个头文件是一个好的想法,特别是当你在选择头文件时想减少时间,我们更加专注于找到算法解决问题而不是软件工程。而从软件工程的视角,我们最好最小化包含头文件,如果你包含了一些你可能不会用到的头文件,就会增加不必要的编译时间和程序大小。 bits/stdc++的缺点
bits/stdc++的优点
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