Package g1201_1300.s1254_number_of_closed_islands

Class Solution

java.lang.Object

g1201_1300.s1254_number_of_closed_islands.Solution

public class Solution
extends Object

1254 - Number of Closed Islands\. Medium 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:**  **Input:** grid = \[\[1,1,1,1,1,1,1,0],[1,0,0,0,0,1,1,0],[1,0,1,0,1,1,1,0],[1,0,0,0,0,1,0,1],[1,1,1,1,1,1,1,0]] **Output:** 2 **Explanation:** Islands in gray are closed because they are completely surrounded by water (group of 1s). **Example 2:**  **Input:** grid = \[\[0,0,1,0,0],[0,1,0,1,0],[0,1,1,1,0]] **Output:** 1 **Example 3:** **Input:** grid = \[\[1,1,1,1,1,1,1], [1,0,0,0,0,0,1], [1,0,1,1,1,0,1], [1,0,1,0,1,0,1], [1,0,1,1,1,0,1], [1,0,0,0,0,0,1], [1,1,1,1,1,1,1]] **Output:** 2 **Constraints:** * `1 <= grid.length, grid[0].length <= 100` * `0 <= grid[i][j] <=1`

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	closedIsland(int[][] grid)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

closedIsland

public int closedIsland(int[][] grid)