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What is the average case complexity of a quick hull algorithm?

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What is the average case complexity of a quick hull algorithm?

(a) O(N)

(b) O(N log N)

(c) O(N^2)

(d) O(log N)

This question was posed to me in unit test.

The doubt is from Computational Geometry in portion Computational Geometry of Data Structures & Algorithms II

1 Answer

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Correct choice is (b) O(N log N)

For explanation: The average case complexity of quickhull algorithm using divide and conquer approach is mathematically found to be O(N log N).

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