LeetCode: Set Matrix Zeroes

LeetCode: Set Matrix Zeroes

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

/**
* Description:
*
* @author hzhou
*/
public class SetMatrixZeroes {
public void setZeroes(int[][] matrix) {
if (matrix == null || matrix.length == 0 || matrix[0].length == 0) {
return;
}
Set<Integer> line = new HashSet<Integer>();
Set<Integer> row = new HashSet<Integer>();
for (int i = 0; i < matrix.length; i++) {
for (int j = 0; j < matrix[0].length; j++) {
if (matrix[i][j] == 0) {
line.add(i);
row.add(j);
}
}
}
for (Integer n : line) {
for (int i = 0; i < matrix[0].length; i++) {
matrix[n][i] = 0;
}
}
for (Integer n : row) {
for (int i = 0; i < matrix.length; i++) {
matrix[i][n] = 0;
}
}
}
}