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Which of the following is not in place sorting algorithm by default?

(a) merge sort

(b) quick sort

(c) heap sort

(d) insertion sort

I had been asked this question during an internship interview.

Origin of the question is Sorting topic in section Sorting of Data Structures & Algorithms II

1 Answer

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Best answer
Correct choice is (a) merge sort

The best I can explain: Quick sort, heap sort, and insertion sort are in-place sorting algorithms, whereas an additional space of O(n) is required in order to merge two sorted arrays. Even though we have a variation of merge sort (to do in-place sorting), it is not the default option. So, among the given choices, merge sort is the most appropriate answer.

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