Another groovy homework. this time Introsort.
From Wikipedia :
Introsort or introspective sort is a sorting algorithm designed by David Musser in 1997. It begins with quicksort and switches to heapsort when the recursion depth exceeds a level based on (the logarithm of) the number of elements being sorted. It is the best of both worlds, with a worst-case O(n log n) runtime and practical performance comparable to quicksort on typical data sets. Since both algorithms it uses are comparison sorts, it too is a comparison sort.
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