Worst case of quicksort Assignment Help
When does the worst case regarding Quicksort occur?
The solution depends upon strategy for choosing pivot. Within earlier versions of Quick Sort in which leftmost (or even rightmost) element is actually chosen as pivot, arises with using conditions.
- Array has already been sorted within exact same order.
- Array has already been sorted in reverse order.
- Just about all elements are same (special case of case 1 and 2)
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Because these types of cases are extremely typical use cases, the issue had been very easily solved through choosing either a random index for the pivot, choosing the middle index of the partition or even (especially for longer partitions) choosing the actual median of the first, middle as well as last element from the partition for that pivot. With one of these modifications, the worst case associated with Quick sort offers much less probabilities to happen, however worst case can still occur if the input array is such that the maximum (or even minimum) element is definitely chosen as pivot.
