Re: [Haskell-cafe] xkcd #287 "NP-Complete"

Albert Y. C. Lai wrote:

You are right, I saw many solutions but they were all equivalent to just those two. I did not avoid permutation-induced redundancy.

I was unsure how to eliminate that redundancy. After reading your algorithm, I see it. Here is my algorithm modified.

In general, I find this kind of stuff really hard to avoid... :-S (Or rather, avoid efficiently.)