C3 Creative Code and Content interview questions

Virus expansion: You are given an m x n grid where each cell can have one of three values: 0 representing an empty cell, 1 representing a healthy person, or 2 representing a sick person. Any healthy person who is 4-directionally adjacent to a sick person becomes sick every minute.Return value true if all people get sick (no healthy people on the grid). false otherwise (If there is at least someone who was not infected)