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Re: Challenge: Another Infinite Lazy List

by kelan (Deacon)
on Mar 18, 2005 at 18:20 UTC ( #440766=note: print w/replies, xml ) Need Help??


in reply to Challenge: Another Infinite Lazy List

Here's my naive Haskell implementation, done without studying any of the others here, though after finishing and looking briefly through them, it is rather similar to some.

merge (x:xs) (y:ys) | x < y = x : merge xs (y:ys) | x > y = y : merge (x:xs) ys | x == y = x : merge xs ys supermerge (x:[]) = x supermerge (x:y:ys) = supermerge $ (merge x y) : ys multiples x = map (*x) [1..] multiplesFromList x = supermerge $ map (multiples) x limbic's_challenge = multiplesFromList [2,3,5]
I'm not sure how fast it is comparatively (especially since I'm running it in Hugs), but I can get a million items in about 20 seconds.

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[choroba]: if you didn't know the precision, what output would you expect?

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