Variable sized array hackerrank - arrays of array, using vectors an easy solution c++ смотреть онлайн

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

Hi, thanks for watching our video about vectors in C++
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- Array of arrays
- Solution

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1:15 Explanation begins
20:25 IDE solution

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Consider an n-element array a, where each index i 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 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 in the array at location 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

All indices in this challenge are zero-based.
All the given numbers are non negative and are not greater than
Output Format

For each pair of i and j values (i.e., for each query), print a single integer that denotes the element located at index 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
Explanation

The diagram below depicts our assembled Sample Input:

We perform the following queries:

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.
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.