Calcudoku puzzle forumhttp://www.calcudoku.org/forum/ 5*5 difficult on 24th May 2016http://www.calcudoku.org/forum/viewtopic.php?f=18&t=795 Page 1 of 1

 Author: randomfruit  [ Tue May 24, 2016 8:21 pm ] Post subject: 5*5 difficult on 24th May 2016 I think there's an error in this puzzle (http://www.calcudoku.org/en/2016-05-24/5/3).I think the box c3*d3*c4*d4=60 could be a mistype for c3*d3*c4*d4=180, or,d5~e5=3 could be a mistype for d5~e5=1. (Writing a~b to mean abs(a-b).)Taking either, but not both, of these results in a soluble puzzle.Of these two, the error d5~e5=1 seems the better, as it results in one solution, whereasc3*d3*c4*d4=1 results in two feasible solutions:5314241523243511243535214and4315251423245311234535214

 Author: pnm  [ Tue May 24, 2016 9:06 pm ] Post subject: Re: 5*5 difficult on 24th May 2016 randomfruit wrote:I think there's an error in this puzzle (http://www.calcudoku.org/en/2016-05-24/5/3).Both solutions you give are not solutions to the puzzle on the page though (?)Edit: for reference, here is the puzzle:

 Author: randomfruit  [ Wed May 25, 2016 9:24 pm ] Post subject: Re: 5*5 difficult on 24th May 2016 OK, now I've seen the solution, and I see that my solver had a bug. It did NOT produce any correct solution to the puzzle, but it did show some 'wrong' solutions when I removed a condition, leading to my comments before.The solver is basically SQL:select a1,a2, etc, b1, b2, etc, #there are 25 tables with names a1 thru e5,from a1,a2, etc, b1, b2, etc, # each of which has one column with the same name as the tablewhere a1!=b1 and etc # and each of which contains the numbers 1..5and a1!=a2 and etc # There are not-equal conditions to prevent duplicatesand a1+b1+a2=12 # and then the puzzle statement...and (c1-d1-c2=0 or d1-c1-c2=0 or c2-c1-d1=0) and e1*d2*e2=12 and b2*a3*b3=8 and c3*d3*c4*d4=60 and (e3/e4=5 or e4/e3=5)and (a4-b4-a5=0 or b4-a4-a5=0 or a5-a4-b4=0)and b5+c5=7and abs(d5-e5)=3;I was running this thru MySQL Workbench and their InnoDB engine.I got outputs as described when I 'removed' a condition, i.e., commented-out# and c3*d3*c4*d4=60 So my SQL code for the problem was wrong, and I found one mis-coded variable name in a condition like "and a1!=a2". It was relatively easy to find using the enhanced windows editor "notepad++" (obtainable from fosshub.org) which put highlights into a source text showing every use of a variable when you double-click on it once.My MySQL solver now finds a correct solution.

 Author: pnm  [ Thu May 26, 2016 8:55 am ] Post subject: Re: 5*5 difficult on 24th May 2016 randomfruit wrote:OK, now I've seen the solution, and I see that my solver had a bug. It did NOT produce any correct solution to the puzzle, but it did show some 'wrong' solutions when I removed a condition, leading to my comments before.Ah... so that's how you get all those points! How long does it run on larger puzzles, say a 9x9?Patrick

 Author: marblevolcano  [ Mon Jul 25, 2016 3:07 pm ] Post subject: Re: 5*5 difficult on 24th May 2016 randomfruit wrote:I think there's an error in this puzzle (http://www.calcudoku.org/en/2016-05-24/5/3).I think the box c3*d3*c4*d4=60 could be a mistype for c3*d3*c4*d4=180, or,d5~e5=3 could be a mistype for d5~e5=1. (Writing a~b to mean abs(a-b).)Uhhh... what?This link takes me to a puzzle with negative numbers (2 through -2). It still says the same date, just not the same puzzle. And also, I still scored 3 points for it even though it was two months ago.

 Author: marblevolcano  [ Mon Jul 25, 2016 3:17 pm ] Post subject: Re: 5*5 difficult on 24th May 2016 marblevolcano wrote:And also, I still scored 3 points for it even though it was two months ago. My mistake! That was today's puzzle, for subscribers only (I think) but somehow I still got points Well, at least I now know how to get 5x5 difficult subscriber only puzzles. Thanks randomfruit

 Author: paulv66  [ Mon Jul 25, 2016 11:22 pm ] Post subject: Re: 5*5 difficult on 24th May 2016 marblevolcano wrote:marblevolcano wrote:And also, I still scored 3 points for it even though it was two months ago. My mistake! That was today's puzzle, for subscribers only (I think) but somehow I still got points Well, at least I now know how to get 5x5 difficult subscriber only puzzles. Thanks randomfruit I also clicked on the link and it allowed me access to today's 5x5 difficult subscriber only puzzle. I earned an extra 3 points but I no longer have a star against my name indicating that I solved all today's puzzles.

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