text: #pragma once
  
  #include <iostream>
  #include <iomanip>
  #include <ostream>
  #include <sstream>
  #include <memory>
  #include <string>
  #include <vector>
  #include <thread>
  #include <map>
  #include <set>
  #include <utility>
  #include <iterator>
  #include <algorithm>
  #include <functional>
  