Question 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.
grid = [["1","1","0"],["0","1","0"],["0","0","1"]] → 3
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Number of Islands m × n binary grid ▶ 1 ▶ 1 ▶ 0 ▶ 0 ▶ 1 ▶ 0 ▶ 0 ▶ 0 ▶ 1 ▶ 1 = land 0 = water 4-neighbors ▶
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