In the last two days I was invigilator at the International Mathematic Olympics 2009 in Bremen, Germany. There we got a problem different from the official math problems. :-) Eventually I solved it using Haskell. Read the detailed description at
http://hackage.haskell.org/package/toilet-0.0.1
I think the problem is simple enough to be used in education of programming.
(I also think it would have been better to avoid monads and use lazy list processing.)
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