I applied online. They asked me to join an online competition, which was scored based on timing, memory, and correctness of the solution. They posed a single problem to all, which is given below.

I am still waiting to get a further response from them. Since I didn't find the efficient solution for it, I am not expecting a positive response.

Q: You are given two arrays of size m and n. Find the common elements between those arrays.

Say, arr1 = {2, 5, 3} and arr2 = {5, 1, 2}. The common elements between those arrays are:

ans = {2, 5}