Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic

Re^2: Lights out puzzle

by ambrus (Abbot)
on Nov 29, 2011 at 14:52 UTC ( #940639=note: print w/ replies, xml ) Need Help??

in reply to Re: Lights out puzzle
in thread Lights out puzzle

This is a nice solution.

I too was thinking that perl might not be the best tool for solving this, but for an entirely different reason. I wasn't thinking of this puzzle as a constraint satisfaction problem. Of course not, since it's

which is what my second solution uses.

But once you mentioned it, viewing as a constraint satisfaction problem also makes sense. After all,

Update: for reference, the last time salva has surprised me with a nice solution using a finite domain constraint solver was Re^4: Seven by seven farming puzzle.

Update: I ran the solution for (20, 20, 2). Your prolog solution took two and a half minutes (I have modified the printing part somewhat, but used GNU prolog). My perl solution took 40 seconds. So my opinion is that this prolog+finite-domain solution is fast enough. (Update: the same solution ran in SWI prolog is riddiculously slow though.)

Comment on Re^2: Lights out puzzle

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://940639]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others studying the Monastery: (9)
As of 2015-12-02 00:02 GMT
Find Nodes?
    Voting Booth?

    My keyboard shows this many letters:

    Results (30 votes), past polls