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OALib Journal期刊
ISSN: 2333-9721
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Solving Single-digit Sudoku Subproblems

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Abstract:

We show that single-digit "Nishio" subproblems in nxn Sudoku puzzles may be solved in time o(2^n), faster than previous solutions such as the pattern overlay method. We also show that single-digit deduction in Sudoku is NP-hard.

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