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Sudoku again

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There were some sudoku puzzles in the in-flight magazine on the plane, so I took the chance to bang out a solver between Denver and Las Vegas. It was absurdly easy. At this point the game no longer interests me.
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It might be absurdly easy (I've had a go at solving it before), but there's obviously money to be made from it - look at the billions of books there are both containing said puzzles and telling you strategies to solve them [oh]


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- Brute force
- Intelligent brute force based on set elimination

If I had to take a bet, solving sudoku probably isn't even O(n^2). Hell, considering the puzzles are constant size...

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