19 lines
573 B
Haskell
19 lines
573 B
Haskell
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import Control.Lens
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import Data.List
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import Control.Monad
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import Data.Ord
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main :: IO ()
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main = do
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input <- lines <$> readFile "input"
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print $ last $ seatList input
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print $ minimumBy (comparing (uncurry (-)) ) $ ap zip tail $ seatList input
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seatList :: [String] -> [Int]
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seatList = sort . map ((uncurry (+) . (_2 *~ 8)) . parseSeat)
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parseSeat :: String -> (Int,Int)
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parseSeat line = (parseOn 'R' cols,parseOn 'B' rows)
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where (cols,rows) = splitAt 3 (reverse line)
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parseOn c = sum . map (round . (**) 2 . fst) . filter (\(_,x)->x==c) . zip [0..]
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