1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold

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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. Example 1: Input: mat = [[1,1,3,2,4,3,2],[1,1,3,2,4,3,2],[1,1,3,2,4,3,2]], threshold = 4 Output: 2 Explanation: The maximum side length of square with sum less than or equal to 4 is 2 as shown. Example 2: Input: mat =

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solution.cppC++17

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