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 '.'
.
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.
public class Solution { public boolean isValidSudoku(char[][] board) { Set<Character> set = new HashSet<Character>(); for (int i = 0; i < board.length; i++) { set.clear(); for (int j = 0; j < board.length; j++) { if (board[i][j]!='.' && !set.add(board[i][j])) { return false; } } } for (int i = 0; i < board.length; i++) { set.clear(); for (int j = 0; j < board.length; j++) { if (board[j][i]!='.' && !set.add(board[j][i])) { return false; } } } for (int i = 0; i < board.length/3; i++) { for (int j = 0; j < board.length/3; j++) { set.clear(); for (int a = i*3; a < i*3+3; a++) { for (int b = j*3; b < j*3+3; b++) { if (board[a][b]!='.' && !set.add(board[a][b])) { return false; } } } } } return true; } }
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