Variable Sized Array.cpp-HackerRank

Problem-Consider an -element array, , where each index  in the array contains a reference to an array of  integers (where the value of  varies from array to array). See the Explanation section below for a diagram.

Given , you must answer  queries. Each query is in the format i j, where  denotes an index in array  and  denotes an index in the array located at . For each query, find and print the value of element  in the array at location  on a new line.

Solution-

#include <cmath>

#include <cstdio>

#include <vector>

#include <iostream>

#include <algorithm>

using namespace std;

int main() 

{   

        int n, q;

    cin >> n >> q;

    int **arr = new int*[n];

    for ( int i = 0, k ; i < n ; ++ i )

    {

        cin >> k;

        arr[i] = new int[k];

        for ( int j = 0 ; j < k ; ++ j )

        {

            cin >> arr[i][j];

        }

    }

    for ( int i = 0, a, b ; i < q ; ++ i )

    {

        cin >> a >> b;   

        cout << arr[a][b] << endl;

    }

}

Link to the problem:-

https://www.hackerrank.com/challenges/variable-sized-arrays/problem

Result!