Main Problem:PAT(basical level) 1028
Related Link:https://blog.csdn.net/qq_34451909/article/details/104752861
What is it?(“bits/stdc++.h”)
StackOverFlow LInk:https://stackoverflow.com/questions/25311011/how-does-include-bits-stdc-h-work-in-c/25311052#25311052
GCC 4.8.0 /bits/stdc++.h source.
PS:GCC(GNU Compiler Collection) GNU(GNU’s Not Unix)
// 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 free6 // software; you can redistribute it and/or modify it under the7 // terms of the GNU General Public License as published by the8 // 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 of13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the14 // GNU General Public License for more details.15 16 // Under Section 7 of GPL version 3, you are granted additional17 // permissions described in the GCC Runtime Library Exception, version18 // 3.1, as published by the Free Software Foundation.19 20 // You should have received a copy of the GNU General Public License and21 // a copy of the GCC Runtime Library Exception along with this program;22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see23 // <http://www.gnu.org/licenses/>.24 25 /** @file stdc++.h26 * This is an implementation file for a precompiled header.27 */28 29 // 17.4.1.2 Headers30 31 // C32 #ifndef _GLIBCXX_NO_ASSERT33 #include <cassert>34 #endif35 #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 >= 201103L52 #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 #endif62 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 >= 201103L98 #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 Main ideas:
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It is basically a header file that also includes every standard library and STL(Standard Template Library) include file. The only purpose of it would be for testing and education.
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Using it would include a lot of unnecessary stuff and increases compilation time.
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