Variable Sized Arrays in C++ – Hacker Rank Solution | HackerRank Programming Solutions | HackerRank C++ Solutions

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Introduction To C++

C++ is a general-purpose programming language that was developed as an enhancement of the C language to include object-oriented paradigm. It is an imperative and a compiled language. 

C++ is a middle-level language rendering it the advantage of programming low-level (drivers, kernels) and even higher-level applications (games, GUI, desktop apps etc.). The basic syntax and code structure of both C and C++ are the same. 

C++ programming language was developed in 1980 by Bjarne Stroustrup at bell laboratories of AT&T (American Telephone & Telegraph), located in U.S.A. Bjarne Stroustrup is known as the founder of C++ language.

Variable Sized Arrays in C++


Consider an n-element array, a, where each index i in the array contains a reference to an array of ki integers (where the value of ki varies from array to array). See the Explanation section below for a diagram.
Given a, you must answer q queries. Each query is in the format i j, where i denotes an index in array a and j denotes an index in the array located at a[i] For each query, find and print the value of element j in the array at location a[i] on a new line.
Click here to know more about how to create variable sized arrays in C++.

Input Format

The first line contains two space-separated integers denoting the respective values of n (the number of variable-length arrays) and q (the number of queries).Each line i of the n subsequent lines contains a space-separated sequence in the format k a[i]0 a[i]1 … a[i]k-1 describing the k-element array located at a[i].
Each of the q subsequent lines contains two space-separated integers describing the respective values of i (an index in array a) and j (an index in the array referenced by a[i] for a query.


  • 1<=n<=10^5
  • 1<=q<=10^5
  • 1<=k<=3.10^5
  • n<=k<=3.10^5
  • 0<=i<n
  • 0<=j<k
  • All indices in this challenge are zero-based.
  • All the given numbers are non negative and are not greater than 10^6

Output Format

For each pair of i and j values (i.e., for each query), print a single integer denoting the element located at index j of the array referenced by a[i]. There should be a total of q lines of output.

Sample Input :

2 2
3 1 5 4
5 1 2 8 9 3
0 1
1 3

Sample Output :

1476906485 2c93045320 variable length arrays

Explanation :

  1. Find the array located at index i =0 , which corresponds to a[0] = [1,5,4]. We must print the value at index j=1 of this array which, as you can see, is 5.
  2. Find the array located at index i=1, which corresponds to a[1]=[1,2,8,9,3]. We must print the value at index j = 3 of this array which, as you can see, is 9.
Variable Sized Arrays in C++ – Hacker Rank Solution
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    int q;
    cin >> n >> q;
    vector<int> a[n];
    for(int i = 0; i < n; i++){
        int m;
        cin >> m;
        int o;
        for(int j = 0; j < m; j++){
            cin >> o;
    int r, s;
    for(int k = 1; k <= q; k++){
        cin >> r >> s;
        cout << a[r][s] << endl;
    return 0;

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