Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place.

Follow up:

Did you use extra space?

A straight forward solution using O(mn) space is probably a bad idea.

A simple improvement uses O(m + n) space, but still not the best solution.

Could you devise a constant space solution?

 

Code:

 

class Solution {public:    void setZeroes(vector
      
       
         > &matrix) {        int m=matrix.size();        int n=matrix[0].size();        int firstrow=0;        int firstcol=0;        for(int i=0;i