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- import Data.List --sort und reverse
- hIndex :: (Num a, Ord a) => [a] -> a
- hIndex l = helper (reverse (sort l)) 0
- where helper [] acc = acc
- helper (z:ls) acc
- | z > acc = helper ls (acc + 1)
- | otherwise = acc
- -- Alternativ
- hindex1 = length . takeWhile id .
- zipWith (<=) [1..] . reverse . sort
- hindex2 = length . takeWhile (\(i, n) -> n >= i) .
- zip [1..] . reverse . sort
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