include <utility>
  include <string>
  include <iostream>
  using namespace std;
  
  int main(int argc, char** argv)
  {
    // two-argument ctor and default ctor
    pair<string, int> myPair("hello", 5), myOtherPair;
  
    // Can assign directly to first and second
    myOtherPair.first = "hello";
    myOtherPair.second = 6;
  
    // copy ctor
    pair<string, int> myThirdPair(myOtherPair);
  
    // operator<
    if (myPair < myOtherPair) {
      cout << "myPair is less than myOtherPair\n";
    } else {
      cout << "myPair is greater than or equal to myOtherPair\n";
    }
  
    // operator==
    if (myOtherPair == myThirdPair) {
      cout << "myOtherPair is equal to myThirdPair\n";
    } else {
      cout << "myOtherPair is not equal to myThirdPair\n";
    }
  
    pair<int, int> aPair = make_pair(5, 10);
  
    return (0);
  }