10 lines
346 B
Haskell
10 lines
346 B
Haskell
import Data.List
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longest xs ys = if length xs > length ys then xs else ys
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lcs xs ys = head $ foldr(\xs -> map head. scanr1 f. zipWith (\x y -> [x,y]) xs) e m where
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m = map (\x -> flip (++) [[]] $ map (\y -> [x | x==y]) ys) xs
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e = replicate (length ys) []
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f [a,b] [c,d]
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| null a = longest b c: [b]
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| otherwise = (a++d):[b]
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