OYO Software Engineer interview questions

You are given an m x n grid where each cell can have one of three values: 0 represents an empty cell, 1 representing a fresh orange, or 2 representing a rotten orange. Every minute, any fresh orange that is 4-directionally adjacent to a rotten orange becomes rotten. Return the minimum number of minutes that must elapse until no cell has a fresh orange. If this is impossible, return -1.

Questions consist of medium to hard level of DSA problems and some questions of computer science fundamentals.