Mastering "Contain Virus": A Step-by-Step Guide to Solving LeetCode Problem 749 with Python

Introduction:

In this article, we tackle the challenging “Contain Virus” problem from LeetCode, where a virus spreads across a grid and you must strategically quarantine it by building walls. I will walk you through my thought process—starting from problem analysis, discussing multiple approaches, and finally coding and refining a solution. Whether you are preparing for coding interviews or just love solving algorithmic puzzles, this guide is designed to help you master problem-solving skills step by step