Given an n x n grid containing only values 0 and 1, where 0 represents water and 1 represents land, find a water cell such that its distance to the nearest land cell is maximized, and return the distance. If no land or water exists in the grid, return -1.
The distance used in this problem is the Manhattan distance: the distance between two cells (x0, y0) and (x1, y1) is |x0 - x1| + |y0 - y1|.
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Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2019/05/03/1336_ex1.JPG\")
\n\nInput: grid = [[1,0,1],[0,0,0],[1,0,1]]\nOutput: 2\nExplanation: The cell (1, 1) is as far as possible from all the land with distance 2.\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2019/05/03/1336_ex2.JPG\")
\n\nInput: grid = [[1,0,0],[0,0,0],[0,0,0]]\nOutput: 4\nExplanation: The cell (2, 2) is as far as possible from all the land with distance 4.\n\n\n
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Constraints:
\n\nn == grid.lengthn == grid[i].length1 <= n <= 100grid[i][j] is 0 or 1Compiled with clang 11 using the latest C++ 20 standard.
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