22 lines
685 B
Haskell
22 lines
685 B
Haskell
import Data.Char (digitToInt)
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import Text.Printf (printf)
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damm :: String -> Bool
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damm = (==0) . foldl (\r -> (table !! r !!) . digitToInt) 0
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where
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table =
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[ [0, 3, 1, 7, 5, 9, 8, 6, 4, 2]
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, [7, 0, 9, 2, 1, 5, 4, 8, 6, 3]
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, [4, 2, 0, 6, 8, 7, 1, 3, 5, 9]
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, [1, 7, 5, 0, 9, 8, 3, 4, 2, 6]
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, [6, 1, 2, 3, 0, 4, 5, 9, 7, 8]
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, [3, 6, 7, 4, 2, 0, 9, 5, 8, 1]
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, [5, 8, 6, 9, 7, 2, 0, 1, 3, 4]
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, [8, 9, 4, 5, 3, 6, 2, 0, 1, 7]
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, [9, 4, 3, 8, 6, 1, 7, 2, 0, 5]
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, [2, 5, 8, 1, 4, 3, 6, 7, 9, 0] ]
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main :: IO ()
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main = mapM_ (uncurry(printf "%6s is valid: %s\n") . ((,) <*> show . damm) . show)
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[5724, 5727, 112946, 112949]
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