185. Valid Sudoku
MediumHash Set
Check whether a partially filled 9×9 Sudoku board is valid: no digit repeats in any row, column or 3×3 box. Empty cells are .. Print YES or NO.
Input format
9 lines of 9 characters (digits or .)
Output format
YES or NO
Example 1
Input
53..7.... 6..195... .98....6. 8...6...3 4..8.3..1 7...2...6 .6....28. ...419..5 ....8..79
Output
YES
Example 2
Input
83..7.... 6..195... .98....6. 8...6...3 4..8.3..1 7...2...6 .6....28. ...419..5 ....8..79
Output
NO
Constraints
Exactly 9 lines.
Read input from standard input and print the answer to standard output. Your code is judged against 4 test cases, most of them hidden.
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