g1501_1600.s1568_minimum_number_of_days_to_disconnect_island

Class Solution

java.lang.Object

g1501_1600.s1568_minimum_number_of_days_to_disconnect_island.Solution

public class Solution
extends Object

1568 - Minimum Number of Days to Disconnect Island.

Hard

You are given an m x n binary grid grid where 1 represents land and 0 represents water. An island is a maximal 4-directionally (horizontal or vertical) connected group of 1’s.

The grid is said to be connected if we have exactly one island , otherwise is said disconnected.

In one day, we are allowed to change any single land cell (1) into a water cell (0).

Return the minimum number of days to disconnect the grid.

Example 1:

Input: grid = [[0,1,1,0],[0,1,1,0],[0,0,0,0]]

Output: 2

Explanation: We need at least 2 days to get a disconnected grid. Change land grid[1][1] and grid[0][2] to water and get 2 disconnected island.

Example 2:

Input: grid = [[1,1]]

Output: 2

Explanation: Grid of full water is also disconnected (1,1 -> 0,0), 0 islands.

Constraints:

• m == grid.length
• n == grid[i].length
• 1 <= m, n <= 30
• grid[i][j] is either 0 or 1.

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

Solution

public Solution()

Method Detail

minDays

public int minDays(int[][] grid)