text: #include <algorithm>
  #include <array>
  #include <atomic>
  #include <bitset>
  #include <ccomplex>
  #include <cctype>
  #include <cerrno>
  #include <cfenv>
  #include <cfloat>
  #include <chrono>
  #include <cinttypes>
  #include <ciso646>
  #include <climits>
  #include <clocale>
  #include <cmath>
  #include <complex>
  #include <condition_variable>
  #include <csetjmp>
  #include <csignal>
  #include <cstdarg>
  #include <cstdbool>
  #include <cstddef>
  #include <cstdint>
  #include <cstdio>
  #include <cstdlib>
  #include <cstring>
  #include <ctgmath>
  #include <ctime>
  #include <cwchar>
  #include <cwctype>
  #include <deque>
  #include <exception>
  #include <forward_list>
  #include <fstream>
  #include <functional>
  #include <future>
  #include <initializer_list>
  #include <iomanip>
  #include <ios>
  #include <iosfwd>
  #include <iostream>
  #include <istream>
  #include <iterator>
  #include <limits>
  #include <list>
  #include <locale>
  #include <map>
  #include <memory>
  #include <mutex>
  #include <new>
  #include <numeric>
  #include <ostream>
  #include <queue>
  #include <random>
  #include <ratio>
  #include <regex>
  #include <scoped_allocator>
  #include <set>
  #include <sstream>
  #include <stack>
  #include <stdexcept>
  #include <streambuf>
  #include <string>
  #include <system_error>
  #include <thread>
  #include <tuple>
  #include <type_traits>
  #include <typeindex>
  #include <typeinfo>
  #include <unordered_map>
  #include <unordered_set>
  #include <utility>
  #include <valarray>
  #include <vector>
  
  int main(int argc, char **argv) {
    std::vector<int> f;
    std::pair<int, int> p;
    std::string str;
    std::stack<int> sta;
    std::queue<double> qu;
    std::map<int, int> mm;
    std::list<float> lf;
    std::set<int> sset;
    std::unordered_set<int> usset;
    std::unordered_map<int, int> ummap;
    std::thread fuck;
    double fcos = std::cos(0);
  }
  