19 lines
501 B
Haskell
19 lines
501 B
Haskell
module Day2A where
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import qualified Data.IntMap as IM
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import Data.Char (ord)
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out :: String -> Int -> Int
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out id' n = min (length $ IM.filter (==n) counts) 1
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where counts = foldr (\c -> IM.insertWith (+) (ord c) 1) IM.empty id'
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handleId :: String -> (Int, Int)
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handleId id' = (out id' 2, out id' 3)
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add2 :: Num a => (a, a) -> (a, a) -> (a, a)
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add2 (a, b) (x, y) = (a + x, b + y)
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main :: IO ()
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main = interact $ show . uncurry (*) . counts . lines
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where counts = foldr (add2 . handleId) (0, 0)
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