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numberOfIslands
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| /* Given an m x n 2D binary grid 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 all surrounded by water. | |
| Example 1: | |
| Input: grid = [ | |
| ["1","1","1","1","0"], | |
| ["1","1","0","1","0"], | |
| ["1","1","0","0","0"], | |
| ["0","0","0","0","0"] | |
| ] | |
| Output: 1 | |
| Example 2: | |
| Input: grid = [ | |
| ["1","1","0","0","0"], | |
| ["1","1","0","0","0"], | |
| ["0","0","1","0","0"], | |
| ["0","0","0","1","1"] | |
| ] | |
| Output: 3 | |
| Constraints: | |
| m == grid.length | |
| n == grid[i].length | |
| 1 <= m, n <= 300 | |
| grid[i][j] is '0' or '1'. | |
| */ |
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