73_set_matrix_zeroes.java

class Solution {
    public void setZeroes(int[][] matrix) {
        Set<Integer> zeroRowSet = new HashSet<>();
        Set<Integer> zeroColSet = new HashSet<>();
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[0].length; j++) {
                if (matrix[i][j] == 0) {
                    zeroRowSet.add(i);
                    zeroColSet.add(j);
                }
            }
        }
        for (int row: zeroRowSet) {
            for (int i = 0; i < matrix[0].length; i++) {
                if (matrix[row][i] != 0) {
                    matrix[row][i] = 0;
                }
            }
        }
        for (int col: zeroColSet) {
            for (int i = 0; i < matrix.length; i++) {
                if (matrix[i][col] != 0) {
                    matrix[i][col] = 0;
                }
            }
        }
        return ;
    }
}


/**
 * This is my personal record of solving Leetcode Problems. 
 * If you have any questions, please discuss them in [Issues](https://github.com/mengxinayan/leetcode/issues).
 * Copyright (C) 2020-2022  mengxinayan
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */