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[LeetCode] Set Matrix Zeroes
Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place.
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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?
class Solution {public: void setZeroes(vector<vector<int> > &matrix) { int row = matrix.size(); if(row==0) return; int col = matrix[0].size(); set<int> ZeroRow,ZeroCol; for(int i=0;i<row;i++) for(int j=0;j<col;j++) { if(matrix[i][j]==0) { ZeroRow.insert(i); ZeroCol.insert(j); } }//end for for(set<int>::iterator iter = ZeroRow.begin();iter!=ZeroRow.end();iter++) for(int j=0;j<col;j++) matrix[*iter][j]=0; for(set<int>::iterator iter = ZeroCol.begin();iter!=ZeroCol.end();iter++) for(int j=0;j<row;j++) matrix[j][*iter]=0; }};
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