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What is the average running time of a quick sort algorithm?

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What is the average running time of a quick sort algorithm?

(a) O(N^2)

(b) O(N)

(c) O(N log N)

(d) O(log N)

I had been asked this question during an interview.

The above asked question is from Quicksort in division Sorting of Data Structures & Algorithms II

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Correct answer is (c) O(N log N)

For explanation: The best case and average case analysis of a quick sort algorithm are mathematically found to be O(N log N).

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