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  1. import Data.List
  2. import Control.Arrow
  3.  
  4. frequencies = map (head &&& length) . group . sort
  5.  
  6. main = print $ frequencies "huipizdadjigurda"
  7.  
Success #stdin #stdout 0s 6280KB
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Standard input is empty
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[('a',2),('d',3),('g',1),('h',1),('i',3),('j',1),('p',1),('r',1),('u',2),('z',1)]
https://ideone.com/eIxc7m
language:
Haskell (ghc 8.4.4)
created:
12 years ago
visibility:
public

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