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What is the auxiliary space requirement of the quickselect algorithm?

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What is the auxiliary space requirement of the quickselect algorithm?

(a) O(n^2)

(b) O(n)

(c) O(n log n)

(d) O(1)

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I want to ask this question from Miscellaneous topic in division Miscellaneous of Data Structures & Algorithms II

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Correct choice is (d) O(1)

Easy explanation - Quickselect algorithm requires no extra space in order to calculate the desired result. It performs manipulations in the given array itself so its auxiliary space requirement will be O(1).

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