DIY: Rotting Oranges

Problem Statement

You are given an m * n grid. Each cell in the grid contains one of the three values: [0, 1, 2]. Each value represents the following:

• 0 represents an empty cell.
• 1 represents a fresh orange.
• 2 represents a rotten orange.

A fresh orange, represented by a 1 in the grid, will be rotten if it is $fourdir$ ...