Number of Islands
MediumGraphs
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.
Example:
Input: grid = [
["1","1","1","1","0"],
["1","1","0","1","0"],
["1","1","0","0","0"],
["0","0","0","0","0"]
]
Output: 1
Constraints:
- •
m == grid.length - •
n == grid[i].length - •
1 <= m, n <= 300 - •
grid[i][j] is '0' or '1'
Number of Islands
MediumGraphs
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.
Example:
Input: grid = [
["1","1","1","1","0"],
["1","1","0","1","0"],
["1","1","0","0","0"],
["0","0","0","0","0"]
]
Output: 1
Constraints:
- •
m == grid.length - •
n == grid[i].length - •
1 <= m, n <= 300 - •
grid[i][j] is '0' or '1'
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