-
Notifications
You must be signed in to change notification settings - Fork 0
/
Day_13_ValidSudoku.java
55 lines (48 loc) · 1.67 KB
/
Day_13_ValidSudoku.java
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
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
package com.TrX;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
public class Day_13_ValidSudoku {
public static boolean isValidSudoku(char[][] board) {
Map<Integer, Set<Integer>> rowMap = new HashMap<>();
Map<Integer, Set<Integer>> colMap = new HashMap<>();
for (int i = 0; i < 9; i++) {
rowMap.put(i, new HashSet<>());
colMap.put(i, new HashSet<>());
}
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
char ch = board[i][j];
if (ch != '.') {
int num = ch - '0';
Set<Integer> rowSet = rowMap.get(i);
if (!rowSet.add(num)) {
return false;
}
Set<Integer> colSet = colMap.get(j);
if (!colSet.add(num)) {
return false;
}
}
}
}
for (int subIdx = 0; subIdx < 9; subIdx++) {
int subRow = 3 * (subIdx / 3);
int subCol = 3 * (subIdx % 3);
Set<Integer> grpSet = new HashSet<>();
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
char ch = board[subRow + i][subCol + j];
if (ch != '.') {
int num = ch - '0';
if (!grpSet.add(num)) {
return false;
}
}
}
}
}
return true;
}
}