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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Entropy-Narcissist/Haskell/entropy-narcissist.hs Normal file
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import qualified Data.ByteString as BS
import Data.List
import System.Environment
(>>>) = flip (.)
main = getArgs >>= head >>> BS.readFile >>= BS.unpack >>> entropy >>> print
entropy = sort >>> group >>> map genericLength >>> normalize >>> map lg >>> sum
where lg c = -c * logBase 2 c
normalize c = let sc = sum c in map (/ sc) c