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36. Valid Sudoku

2024-09-09 09:59:20   215人阅读

Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules.

The Sudoku board could be partially filled, where empty cells are filled with the character ‘.‘.

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A partially filled sudoku which is valid.

 

Note:
A valid Sudoku board (partially filled) is not necessarily solvable. Only the filled cells need to be validated.

本题是比较有趣的一道题，查看数独是否为有效的valid，难点在于正方形的判断的坐标上，代码如下：

 1 public class Solution {
 2     public boolean isValidSudoku(char[][] board) {
 3         for(int i=0;i<9;i++){
 4             Set<Character> row = new HashSet<Character>();
 5             Set<Character> col = new HashSet<Character>();
 6             Set<Character> dia = new HashSet<Character>();
 7             for(int j=0;j<9;j++){
 8                 if(board[i][j]!=‘.‘&&row.contains(board[i][j])){
 9                     return false;
10                 }else{
11                     row.add(board[i][j]);
12                 }
13                 if(board[j][i]!=‘.‘&&col.contains(board[j][i])){
14                     return false;
15                 }else{
16                     col.add(board[j][i]);
17                 }
18                 if(board[i/3*3+j/3][i%3*3+j%3]!=‘.‘&&dia.contains(board[i/3*3+j/3][i%3*3+j%3])){
19                     return false;
20                 }else{
21                     dia.add(board[i/3*3+j/3][i%3*3+j%3]);
22                 }
23             }
24         }
25         return true;
26     }
27 }

 

36. Valid Sudoku


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