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What is the auxiliary space requirement of permutation sort?

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What is the auxiliary space requirement of permutation sort?

(a) O(n)

(b) O(1)

(c) O(log n)

(d) O(n log n)

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I would like to ask this question from Sorting topic in chapter Sorting of Data Structures & Algorithms II

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Correct option is (b) O(1)

Best explanation: Permutation sort algorithm does not require any extra space for sorting the input array. Thus its auxiliary space requirement is O(1).

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