22 lines
566 B
Haskell
22 lines
566 B
Haskell
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import Control.Arrow
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import Control.Monad
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import Data.List
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main :: IO ()
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main = do
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input <- map read . lines <$> readFile "input"
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print $ (product . map length . group . sort . jolts) input
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print $
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(product . map (arrangements . sum) . filter (elem 1) . group . jolts) input
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arrangements :: Int -> Int
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arrangements n =
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length $
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filter (== n) $ map sum $ nub $ map (filter (/= 0)) $ replicateM n [0 .. 3]
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jolts :: [Int] -> [Int]
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jolts =
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map (uncurry subtract) .
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ap zip tail .
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uncurry (++) . (id &&& (flip (:) [] . (+ 3) . last)) . (:) 0 . sort
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