#1385Medium#23 in Coupang's list· asked at 48 companies
Number of islands
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What we know
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'.