Given a m x n matrix mat and an integer threshold, return the maximum side-length of a square with a sum less than or equal to threshold or return 0 if there is no such square.
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Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2019/12/05/e1.png\")
\n\nInput: mat = [[1,1,3,2,4,3,2],[1,1,3,2,4,3,2],[1,1,3,2,4,3,2]], threshold = 4\nOutput: 2\nExplanation: The maximum side length of square with sum less than 4 is 2 as shown.\n\n\n
Example 2:
\n\n\nInput: mat = [[2,2,2,2,2],[2,2,2,2,2],[2,2,2,2,2],[2,2,2,2,2],[2,2,2,2,2]], threshold = 1\nOutput: 0\n\n\n
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Constraints:
\n\nm == mat.lengthn == mat[i].length1 <= m, n <= 3000 <= mat[i][j] <= 1040 <= threshold <= 105Compiled with clang 11 using the latest C++ 17 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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