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  1. import Control.Arrow
  2. import Control.Monad
  3. import Data.List (group)
  4.  
  5. main :: IO ()
  6. main = mapM_ putStrLn . take 11 . iterate f $ "1"
  7.  
  8. f :: String -> String
  9. f = group >=> length &&& head >>> show *** (:[]) >>> uncurry (++)
  10.  
Success #stdin #stdout 0s 6220KB
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stdin
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Standard input is empty
stdout
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1
11
21
1211
111221
312211
13112221
1113213211
31131211131221
13211311123113112211
11131221133112132113212221
https://ideone.com/qhsRPc
language:
Haskell (ghc 8.4.4)
created:
11 years ago
visibility:
public

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