Heh, I've seen that before, but which one of the first two sections are correct? And what's the difference between "different" and "essentially different"?Mordred wrote:Right. Just make sure your id column in the database is not int, as the autoincrement will overflow...
http://www.afjarvis.staff.shef.ac.uk/sudoku/
How to check if a comon sudoku puzzle is solvable
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