Oddly, the Haskell version of Quicksort is probably the easiest to understand:
qsort  =  qsort (x:xs) = qsort (filter (< x) xs) ++ [x] ++ qsort (filter (>= x) xs)The first line reads: the result of sorting an empty list () is an empty list.
The second line reads: to sort a list whose first element is x and the rest of which is called xs, sort the elements of xs that are less than x, sort the elements of xs that are greater than or equal to x and concatenate (++) the results with x sandwiched in the middle.
To learn more about quicksort’s behaviour see Eppstein’s paper. QuickSort source code download..
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