0073.cpp

#include <vector>
using namespace std;

class Solution {
public:
    void setZeroes(vector<vector<int>>& matrix) {
        bool row = false, col = false;
        int m = matrix.size(), n = matrix[0].size();

        for (int i = 0; i < m; i++)
            if (matrix[i][0] == 0) row = true; 
        for (int j = 0; j < n; j++)
            if (matrix[0][j] == 0) col = true; 

        for (int i = 1; i < m; i++)
            for (int j = 1; j < n; j++)
                if (matrix[i][j] == 0)
                {
                    matrix[i][0] = 0;
                    matrix[0][j] = 0;
                }

        for (int i = 1; i < m; i++)
            for (int j = 1; j < n; j++)
                if (matrix[i][0] == 0 || matrix[0][j] == 0)
                    matrix[i][j] = 0;

        if (row)
            for (int i = 0; i < m; i++)
                matrix[i][0] = 0;
        if (col)
            for (int j = 0; j < n; j++)
                matrix[0][j] = 0;
        return ;
    }
};