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Introsort begins with quicksort and switches to heapsort when the recursion depth exceeds a level based on the number of elements being sorted. What is that number? Is there a specific range or a limiting value?
The point at which the Introsort algorithm switches from Quicksort to Heapsort is determined by depth_limit:
Where l is the length of the sequence that is to be sorted, so l=n for the whole sequence. With each recursive call depth_limit is decremented by one. When depth_limit reaches 0, it switches from Quicksort to Heapsort.