void vector_pair(){
  vector<pair<int, string>> v;
  v.push_back({9, "apple" });
  v.push_back({1, "banana" });
  v.push_back({6, "melon" });
  v.push_back({3, "apple" });
  v.push_back({2, "orange" });

  //sort
  sort(v.begin(), v.end());
  for (auto A : v) cout << A.first << " " << A.second << endl;
  cout<<"-------------------"<<endl;
  sort(v.rbegin(), v.rend());
  for (auto A : v) cout << A.first << " " << A.second << endl;
  for (auto it = v.begin(); it != v.end(); ++it)

   //printf("%d ", it->first);
   cout<<it->first<<" "<<it->second<<endl;
return ;
===================

Processing vector_pair.C...
1 banana
2 orange
3 apple
6 melon
9 apple
-------------------
9 apple
6 melon
3 apple
2 orange
1 banana
9 apple
6 melon
3 apple
2 orange
1 banana

void vector_pair(){
    vector<pair<int, string>> v;
    v.push_back({9, "apple" });
    v.push_back({1,  "banana" });
    v.push_back({6,  "melon" });
    v.push_back({3,  "apple" });
    v.push_back({2, "orange" });

    //sort
    sort(v.begin(), v.end());
    for (auto A : v) cout << A.first << " " << A.second << endl;
    cout<<"-------------------"<<endl;
    sort(v.rbegin(), v.rend());
    for (auto A : v) cout << A.first << " " << A.second << endl;


    return ;
}



==============================

1 banana
2 orange
3 apple
6 melon
9 apple
-------------------
9 apple
6 melon
3 apple
2 orange
1 banana