text: #include <iostream>
  #include <vector>
  //#include <pair> // there is no <pair>, it is defined by default
  #include <utility>
  
  void print(std::pair<int, int> &pair)
  {
  	std::cout << pair.first << " " << pair.second << std::endl;
  }
  
  int main()
  {
  	{ // this is initializer
  		std::pair<int, int> obj(10, 20);
  		print(obj);
  	}
  
  	{ // initializer
  		std::pair<int, int> obj = std::make_pair(10, 20);
  		// make_pair is preferable
  		print(obj);
  	}
  	return 0;
  }
  
  