GATE | GATE-CS-2001 | Question 14

Randomized quicksort is an extension of quicksort where the pivot is chosen randomly. What is the worst case complexity of sorting n numbers using randomized quicksort?
(A) O(n)
(B) O(n Log n)
(C) O(n2)
(D) O(n!)


Answer: (C)

Explanation: Randomized quicksort has expected time complexity as O(nLogn), but worst case time complexity remains same. In worst case the randomized function can pick the index of corner element every time.

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