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Title User Message Date Posted
Pissed off because of input.... WarHawk1 there should be 0 instead of period to show empty positions... Oct 11, 2015 - 9:02:52 pm UTC
Re: solved! bbi5291 meh. Knuth's solution uses "Dancing Links", which involves shuffling pointers in order to avoid extensive amounts of modification that would ordinarily be made when recursing. It's just a way of speed... Aug 10, 2010 - 2:44:49 am UTC
solved! ryuuga I was trying to fill in as much of the grid with a few basic sudoku strategies, reducing the number of possibilities for each cell, then if it was not solved, recurse on all possibilities in a cell wh... Aug 09, 2010 - 8:51:56 pm UTC
Re: Re: Help Logical1111 OMG! My "solution" fails so badly it's funny... Jul 30, 2009 - 1:37:42 am UTC
Re: Help bbi5291 The magic algorithm I implemented (by D. E. Knuth himself) says there's only one solution to each case. Therefore, there is only one solution to each case. I guarantee it! How do you think Daniel got ... Jul 30, 2009 - 12:30:11 am UTC
Help Logical1111 Come on, this is ridiculous. My submission works for both of these given test-cases but works for none of the actual 50 cases. Can there be multiple solutions, because my program does not consider thi... Jul 30, 2009 - 12:24:24 am UTC
Re: Re: wow.... hansonw1 Hmm, Ruby is significantly slower - an algorithm similar to Daniel's took 18 seconds on case #48. (whereas his took about 1.1s) However, using Ruby 1.9 sped this up to about 8 seconds. When I try to ... Jul 29, 2009 - 1:40:15 pm UTC
Re: Re: wow.... bbi5291 Well - how much slower? My C++ solution passes every case in no more than 12 ms. Unless Ruby is hundreds of times slower than C++ (honestly, I see no reason why it should be more than 10-20 times slow... Jul 29, 2009 - 2:27:42 am UTC
Re: Re: wow.... jargon I disagree. It may be fast for some languages, but others (like Ruby) are far slower here. In Ruby, primes takes 3 ms on my computer. It takes eight times that amount here. Jul 29, 2009 - 2:20:12 am UTC
Re: wow.... bbi5291 I'm still thinking about what to do with this problem. Perhaps I will make it 16x16... (the issue here is that the judge is simply too fast) Jul 28, 2009 - 4:04:20 pm UTC