Random-Pivot Quicksort in Haskell?

In such cases, where you know that the function is referentially transparent, but you can't proof it to the compiler, you may use the function unsafePerformIO :: IO a -> a from the module Data. Unsafe .

You are making a false assumption that picking the pivot point is just an implementation detail. Consider a partial ordering on a set. Like a quicksort on cards where.

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