9 lines
274 B
Haskell
9 lines
274 B
Haskell
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import Data.List (subsequences, tails, delete)
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disjoint a = concatMap (cutAt a) [1..length a - 2] where
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cutAt s n = [a ++ b | b <- delete [] (subsequences right),
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a <- init (tails left) ] where
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(left, _:right) = splitAt n s
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main = print $ length $ disjoint [1..20]
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