1254. Number of Closed Islands
Last updated
Last updated
https://leetcode.com/problems/number-of-closed-islands
Given a 2D grid
consists of 0s
(land) and 1s
(water). An island is a maximal 4-directionally connected group of 0s
and a closed island is an island totally (all left, top, right, bottom) surrounded by 1s.
Return the number of closed islands.
Example 1:
Example 2:
Example 3:
Constraints:
1 <= grid.length, grid[0].length <= 100
0 <= grid[i][j] <=1