题目：

题解：

class Solution {public void setZeroes(int[][] matrix) {int m = matrix.length, n = matrix[0].length;boolean flagCol0 = false;for (int i = 0; i < m; i++) {if (matrix[i][0] == 0) {flagCol0 = true;}for (int j = 1; j < n; j++) {if (matrix[i][j] == 0) {matrix[i][0] = matrix[0][j] = 0;}}}for (int i = m - 1; i >= 0; i--) {for (int j = 1; j < n; j++) {if (matrix[i][0] == 0 || matrix[0][j] == 0) {matrix[i][j] = 0;}}if (flagCol0) {matrix[i][0] = 0;}}}
}