3567. Minimum Absolute Difference in Sliding Submatrix

You are given an m x n integer matrix grid and an integer k. For every contiguous k x k submatrix of grid, compute the minimum absolute difference between any two distinct values within that submatrix. Return a 2D array ans of size (m - k + 1) x (n - k + 1), where ans[i][j] is the minimum absolute difference in the submatrix whose top-left corner is (i, j) in grid. Note: If all elements in the