Bentley and McIlroy suggest the following modification to the quicksort algorithm when dealing with data sets that
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Bentley and McIlroy suggest the following modification to the quicksort algorithm when dealing with data sets that contain many repeated elements. Instead of partitioning as
(where ≤ denotes the elements that are ≤ the pivot), it is better to partition as
However, that is tedious to achieve directly. They recommend to partition as
and then swap the two = regions into the middle. Implement this modification and check whether it improves performance on data sets with many repeated elements.
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