How to Solve Number of Islands From Blind 75 LeetCode Questions

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We will learn how to solve "Number of Islands" from Blind 75 LeetCode Questions.
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Given an m x n 2D binary grid which represents a map of '1's (land) and '0's (water), return the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are surrounded by water.

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