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18 lines
447 B
18 lines
447 B
import Data.List
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digits :: Int -> [Int]
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digits n = unfoldr nextDigit n where
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nextDigit 0 = Nothing
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nextDigit c = Just (c `mod` 10, c `div` 10)
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isSorted :: Int -> Bool
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isSorted n = all (uncurry (<=)) ds' || all (uncurry (>=)) ds''
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where ds = digits n
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ds' = zip ds (maxBound : ds)
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ds'' = zip ds (minBound : ds)
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main = do
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print $ isSorted 123456
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print $ isSorted 1234561
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print $ isSorted 97541
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print $ isSorted 99431
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