Munchausen numbers: Difference between revisions
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main = print $ filter isMunchausen [1 .. 5000]</lang> |
main = print $ filter isMunchausen [1 .. 5000]</lang> |
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Or, without digitToInt, but importing join and |
Or, without digitToInt, but importing join, swap and bool. |
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<lang haskell>import Control.Monad (join) |
<lang haskell>import Control.Monad (join) |
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import Data.List (unfoldr) |
import Data.List (unfoldr) |
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import Data.Bool (bool) |
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import Data.Tuple (swap) |
import Data.Tuple (swap) |
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isMunchausen :: Integer -> Bool |
isMunchausen :: Integer -> Bool |
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isMunchausen = |
isMunchausen = |
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(==) <*> |
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(foldr ((+) . join (^)) 0 . |
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digit 0 = Nothing |
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unfoldr ((flip bool Nothing . Just . swap . flip quotRem 10) <*> (0 ==))) |
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main :: IO () |
main :: IO () |
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