Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in-place.
Example 1:
Input: [ [1,1,1], [1,0,1], [1,1,1] ] Output: [ [1,0,1], [0,0,0], [1,0,1] ]
Example 2:
Input: [ [0,1,2,0], [3,4,5,2], [1,3,1,5] ] Output: [ [0,0,0,0], [0,4,5,0], [0,3,1,0] ]
Follow up:
<li>A straight forward solution using O(<em>m</em><em>n</em>) space is probably a bad idea.</li>
<li>A simple improvement uses O(<em>m</em> + <em>n</em>) space, but still not the best solution.</li>
<li>Could you devise a constant space solution?</li>