1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold
Medium
30 Points
Array
Binary Search
Matrix
Prefix Sum
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.
Examples
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 4 is 2 as shown.
Example 2
Input: 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
Output: 0
Constraints
m == mat.lengthn == mat[i].length1 <= m, n <= 3000 <= mat[i][j] <= 1040 <= threshold <= 105
1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold
Medium
30 Points
Array
Binary Search
Matrix
Prefix Sum
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.
Examples
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 4 is 2 as shown.
Example 2
Input: 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
Output: 0
Constraints
m == mat.lengthn == mat[i].length1 <= m, n <= 3000 <= mat[i][j] <= 1040 <= threshold <= 105