HackerRank.com Practice > C++ > Introduction > Variable Sized Arrays

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Problem Link : https://www.hackerrank.com/challenges/variable-sized-arrays/problem?h_r=next-challenge&h_v=zen&h_r=next-challenge&h_v=zen&h_r=next-challenge&h_v=zen&h_r=next-challenge&h_v=zen

#include <iostream>
#include <vector>

using namespace std;

int main() {
    int lenVector, lenQuery;
    cin >> lenVector;
    cin >> lenQuery;

    vector<vector<int>> vs(lenVector);

    for (int i = 0; i < lenVector; ++i) {
        int n;
        cin >> n;
        for (int ii = 0; ii < n; ++ii) {
            int t;
            cin >> t;
            vs[i].push_back(t);
        }   
    }

    while (lenQuery > 0) {
        int i, j;
        cin >> i >> j;
        cout << vs[i][j] << '\n';
        --lenQuery;
    }

    return 0;
}