leetcode Max Sum of Rectangle No Larger Than K
Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is no larger than k.
12345 Given matrix = [[1, 0, 1],[0, -2, 3]]k = 2
The answer is
2. Because the sum of rectangle
[[0, 1], [-2, 3]]is 2 and 2 is the max number no larger than k (k = 2).
- The rectangle inside the matrix must have an area > 0.
- What if the number of rows is much larger than the number of columns?