Swapping in a matrix

You are given a binary matrix (i.e. each element of matrix is either 0 or 1) of size n × n. You want to re-arrange 1's in such a way that they form a rectangular region. Note that the rectangular region should be made of only 1's, and all the 1's of the entire matrix should be in this rectangular region. For achieving rectangular region, you can swap any two elements of the matrix. Please find ou