C++ || STL || standard template libraries

                               C++ STL 

1.     Pair : 

Syntax : 

    pair <int,char> p1;

    it creates a pair {2,'c'} like this. 

    

    pair <int,int> p2;

    it creates a pair {2,3} like this . 

Basic Code : 

#include <bits/stdc++.h>
using namespace std;
int main()
{
    // cout<<"hello world\n";
    pair <int,int> p1 = {1,2};
    cout<<p1.first<< " "<< p1.second<<endl;
    
    pair <int, pair<int ,char>> p2 = {1,{2,'c'}};
    cout<<p2.first<<" "<<p2.second.first<<" "<<p2.second.second<<endl;
    
    pair <int,int> arr[] = {{2,3},{4,5},{6,7}};
    cout<<arr[0].first<< " "<<arr[2].second<<" "<<endl;
    return 0;
}

Output: