73.cpp

class Solution {
public:
    void setZeroes(vector<vector<int>> &matrix) {
        int m = matrix.size(), n = m == 0 ? 0 : matrix[0].size();
        if (m <= 0)
            return;
        bool col = false, row = false;
        for (int i = 0; i < m; ++i)
            for (int j = 0; j < n; ++j) {
                if (matrix[i][j] == 0) {
                    if (i == 0)
                        row = true;
                    if (j == 0)
                        col = true;
                    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 j = 0; j < n; ++j)
                matrix[0][j] = 0;
        if (col)
            for (int i = 0; i < m; ++i)
                matrix[i][0] = 0;
    }
};