Jonas Almström Duregård
Ertugrul: while your solution is minimalistic, Rafael deemed his ~n*log n implementation too inefficient. Thus your ~n^3 implementation is hardly an improvement...
My variant has an advantage, though. It is completely lazy, so it will take a shortcut, as soon as a duplicate is found. Depending on his application, this may be useful or not. I think the nub-based solution is the best one in general, but it's the base library implementation of nub, which is unfortunate. In fact, with a better nub implementation, this becomes an O(n * log n) time algorithm, too, but with the additional laziness advantage. The article you linked to contains such an implementation, I think. Greets Ertugrul -- nightmare = unsafePerformIO (getWrongWife >>= sex) http://blog.ertes.de/