Package g1201_1300.s1254_number_of_closed_islands

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    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

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final Integer closedIsland(Array<IntArray> grid)

      • Methods inherited from class java.lang.Object

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