[Haskell-cafe] uncommon IMO problem - toilet management

Henning Thielemann lemming at henning-thielemann.de
Fri Jul 17 16:25:48 EDT 2009

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

I think the problem is simple enough to be used in education of 

(I also think it would have been better to avoid monads and use lazy list 

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