Variable Sized Array [HackerRank Practice]

varSizedArrayHackerrank.cpp

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n, q, indexA, indexI;
		//input size of array and no of queries
    cin>>n>>q;
    vector<int> a[n];
    for(int i=0; i<n; i++){
				//Get no. of Inputs in ins and get the value of array val.
        int ins, val;
        cin>>ins;
        for(int j=0; j<ins; j++){
            cin>>val;
						//Push back val to the array at a[i]
            a[i].push_back(val);
        }
    }
    for(int i=0; i<q; i++){
        cin>>indexA>>indexI;
        cout<<a[indexA][indexI]<<"\n";
    }
    return 0;
}