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What is the worst case time complexity of the Quick sort?

(a) O(nlogn)

(b) O(n)

(c) O(n^3)

(d) O(n^2)

The question was posed to me in an interview.

My doubt is from Quicksort topic in division Sorting of Data Structures & Algorithms II

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The correct answer is (d) O(n^2)

Easy explanation - The worst case running time for Quick sort is O(n^2). In Quick sort, the worst case behaviour occurs when the partitioning routine produces two sub-arrays one with n – 1 element and other with 0 elements.

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