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.
\n\nIn 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.
\n\n\n
Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2021/12/24/land1.jpg\")
\n\nInput: grid = [[0,1,1,0],[0,1,1,0],[0,0,0,0]]\n\nOutput: 2\nExplanation: We need at least 2 days to get a disconnected grid.\nChange land grid[1][1] and grid[0][2] to water and get 2 disconnected island.\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2021/12/24/land2.jpg\")
\n\nInput: grid = [[1,1]]\nOutput: 2\nExplanation: Grid of full water is also disconnected ([[1,1]] -> [[0,0]]), 0 islands.\n\n\n
\n
Constraints:
\n\nm == grid.lengthn == grid[i].length1 <= m, n <= 30grid[i][j] is either 0 or 1.给你一个大小为 m x n ，由若干 0 和 1 组成的二维网格 grid ，其中 1 表示陆地， 0 表示水。岛屿 由水平方向或竖直方向上相邻的 1 （陆地）连接形成。
如果 恰好只有一座岛屿 ，则认为陆地是 连通的 ；否则，陆地就是 分离的 。
\n\n一天内，可以将 任何单个 陆地单元（1）更改为水单元（0）。
返回使陆地分离的最少天数。
\n\n\n\n
示例 1：
\n\n\n输入：grid = [[0,1,1,0],[0,1,1,0],[0,0,0,0]]\n输出：2\n解释：至少需要 2 天才能得到分离的陆地。\n将陆地 grid[1][1] 和 grid[0][2] 更改为水，得到两个分离的岛屿。\n\n
示例 2：
\n\n\n输入：grid = [[1,1]]\n输出：2\n解释：如果网格中都是水，也认为是分离的 ([[1,1]] -> [[0,0]])，0 岛屿。\n\n\n
\n\n
提示：
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