Input is a matrix of size n x m of 0s and 1s.

eg:
1 0 0 1
0 0 1 0
0 0 0 0

If a location has 1; make all the elements of that row and column = 1. eg

1 1 1 1
1 1 1 1
1 0 1 1

Solution should be with Time complexity = O(n*m) and O(1) extra space

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