Catalan number
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| Language | Haskell |
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| Owner | naren1012 |
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| Visibility | Public |
import Control.Applicative
import Control.Monad
main :: IO ()
main = print =<< catalan <$> readLn
catalan :: Integral a => a -> a
catalan n = product [n+1..2*n] `div` product [1..n] `div` (n+1)
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