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Exercise
Redo the Quicksort class to have the modifications given for Programming Projects 1 and 2.
Project 1
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Exercise
Recode the Quicksort class implementation by adding two efficiency improvements to the method sort: (1) Eliminate the calls to join, because it accomplishes nothing. (2) Add code for the special case of an array of exactly two elements and make the general case apply to arrays of three or more elements.
Project 2
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Exercise
Redo the Quicksort class so that it chooses the splitting point as follows: The splitting point is the middle (in size) of the first element, the last element, and an element at approximately the middle of the array. This will make a very uneven split less likely.
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