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C++ Pair Template in STL Program

Hello Everyone!

In this tutorial, we will learn about the working of a Pair Template its implementation using a Vector in the C++ programming language.

To understand the basic functionality of the Pair Template, we will recommend you visit C++ STL Pair Template, where we have explained this concept in detail from scratch.

For a better understanding of its implementation, refer to the well-commented C++ code given below.


#include <iostream>
#include <bits/stdc++.h>

using namespace std;

int main()
    cout << "\n\nWelcome to Studytonight :-)\n\n\n";
    cout << " =====  Program to demonstrate the working of a Pair Template in STL, in CPP  ===== \n\n";

    cout << "\n\nDeclaring a Vector and Filling it with pair of two integers.\n\n";

    //create an empty vector of pair
    vector<pair<int, int>> v;

    //insert elements into the vector
    v.push_back(make_pair(8, 64));
    v.push_back(make_pair(1, 1));
    v.push_back(make_pair(3, 6));
    v.push_back(make_pair(2, 4));
    v.push_back(make_pair(5, 25));

    //prining the vector of pairs
    cout << "Printing the Vector of Pairs: \n";

    int n = v.size();

    //Printing the vector
    for (int i = 0; i < n; i++)
        cout << "\nSquare of " << v[i].first << " is " << v[i].second; //accessing the pair elements

    //Sorting the vector in ascending order - by default on the basis of first element of the pair
    sort(v.begin(), v.end());

    cout << "\n\n\n\nThe elements of the Vector after Sorting are:\n ";

    //prining the Sorted vector
    for (int i = 0; i < n; i++)
        cout << "\nSquare of " << v[i].first << " is " << v[i].second; //accessing the pair elements

    cout << "\n\n\n";

    return 0;


C++ pair template

We hope that this post helped you develop a better understanding of the concept of the Pair Template and its implementation in CPP. For any query, feel free to reach out to us via the comments section down below.

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Nikita Pandey is a talented author and expert in programming languages such as C, C++, and Java. Her writing is informative, engaging, and offers practical insights and tips for programmers at all levels.