berpasangan di tumpukan
stack<pair<char, int>> s;
s.push({'A', 20 });
s.push(make_pair('B', 30));
cout << s.top().first << " " << s.top().second;
s.pop();
Vishnu
stack<pair<char, int>> s;
s.push({'A', 20 });
s.push(make_pair('B', 30));
cout << s.top().first << " " << s.top().second;
s.pop();