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Quicksort is a sorting algorithm invented by C. A. R. Hoare that has an average-case complexity of O(n log n), worst-case complexity of O(n^2). It is one of the fastest general-purpose sorting algorithms in practice.

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Quick Sort: Mutable or ST Array

This is the most Monadic code I have written to date :-) and I'd welcome comments. I'm also struck how much faster this mutable approach is than the immutable version I first wrote (see end). OK, so …
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