Created
October 12, 2015 06:18
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コラッツ列とflipをラムダで書いたもの #CodePiece
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| chain :: Integer -> [Integer] | |
| chain 1 = [1] | |
| chain n | |
| | even n = n : chain (n `div` 2) | |
| | odd n = n : chain (n * 3 + 1) | |
| numLongChains :: Int | |
| numLongChains = length (filter (\xs -> length xs > 15) (map chain [1..100])) | |
| flip' :: (a -> b -> c) -> b -> a -> c | |
| flip f = \x y -> f y x |
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