Variable Sized Arrays in C++ HackerRank Solution

Hello Programmers, In this post, you will know how to solve the Variable Sized Arrays in C++ HackerRank Solution. This problem is a part of the HackerRank C++ Programming Series.

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Variable Sized Arrays in C++ HackerRank Solution

One more thing to add, don’t directly look for the solutions, first try to solve the problems of Hackerrank by yourself. If you find any difficulty after trying several times, then you can look for solutions.

Variable Sized Arrays in C++ HackerRank Solution

Problem

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.

Constraints

  • 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 :

5
9
Variable Sized Arrays in C++ Hacker Rank Solution

Explanation :

The diagram below depicts our assembled Sample Input:

We perform the following q = 2 queries:

  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++ HackerRank 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;
            a[i].push_back(o);
        }
    }
    int r, s;
    for(int k = 1; k <= q; k++){
        cin >> r >> s;
        cout << a[r][s] << endl;
    }
    return 0;
}

Disclaimer: The above Problem (Variable Sized Arrays in C++) is generated by Hackerrank but the Solution is Provided by BrokenProgrammers. This tutorial is only for Educational and Learning purposes.

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