Re: sudoku dictionary attack
[EMAIL PROTECTED] wrote: > Thought I'd offer a method for solving all possible 9x9 sudoku puzzles > in one go. It'll takes a bit of time to run however (and 9x9 seems to > be about as big as is reasonably possible before combinatorial > explosion completely scuppers this type of program)... > > Basic idea:- > > Start with a grid initialised with: > > 123456789 > 234567891 > 345678912 > 456789123 > 567891234 > 678912345 > 789123456 > 891234567 > 912345678 > > Note that all rows and columns contain all 9 digits (but that the > sub-tiles aren't correct for a sudoku solution). > > Next write a program which permutes all 9 columns, and then for each of > those permutations permutes the last 8 rows. This will, I believe, > generate all possible grids with no digit repetitions in any row or > column. It will generate 14,631,321,600 (9!*8!) possible sudoku > candidates. Finally, check each candidate to see if any 3x3 subtile has > a repeated digit in it and discard as soon as a repeat is found (sooner > the better). Any that come through unscathed get written as a 82 (81 + > lf) char string to an output file. I'm having trouble coming up with anything that fits this grid: ..12. ..2x. . . . . . . . where x is not 3, by permuting columns, then rows. You may also have to permute the numbers. Although, even then, x=1 is still impossible. -- http://mail.python.org/mailman/listinfo/python-list
Re: sudoku dictionary attack
Has some one an sodoku-task-generator? Here another solutions-ways: http://www.python-forum.de/viewtopic.php?t=3378 -- input -- http://mail.python.org/mailman/listinfo/python-list
Re: sudoku dictionary attack
"Oliver Albrecht" <[EMAIL PROTECTED]> wrote ... > Has some one an sodoku-task-generator? Sudoku puzzles can be generated (and solved) online at http://act365.com/sudoku/ -- http://mail.python.org/mailman/listinfo/python-list
Re: sudoku dictionary attack
On Mon, 20 Jun 2005 23:30:27 +0200, Oliver Albrecht <[EMAIL PROTECTED]> wrote: >Has some one an sodoku-task-generator? >Here another solutions-ways: >http://www.python-forum.de/viewtopic.php?t=3378 It's presumably easy to turn a solver into a generator. Start with a random grid, and remove squares at random, and then solve it. Once solving it reaches a certain level of difficulty, then there's your problem. -- On-line canal route planner: http://www.canalplan.org.uk (Waterways World site of the month, April 2001) -- http://mail.python.org/mailman/listinfo/python-list
Re: sudoku dictionary attack
Nick Atty wrote: > On-line canal route planner: http://www.canalplan.org.uk So the Travelling Salesman goes by narrow boat these days, does he? Nigel -- ScriptMaster language resources (Chinese/Modern & Classical Greek/IPA/Persian/Russian/Turkish): http://www.elgin.free-online.co.uk -- http://mail.python.org/mailman/listinfo/python-list
