Given an n*n matrix containing 1s and 0s, and an integer k, find a rectangular region within the matrix that contains exactly k 1s.

Question

Accepted Answer

Find a rectangular region in a binary matrix with k 1's.

Iterate over all possible rectangular regions and count the number of 1's in each.
Use a sliding window approach to efficiently count the number of 1's in each rectangular region.
Use dynamic programming to precompute the number of 1's in each sub-rectangle and answer queries in constant time.