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Which of the following sorting algorithm has best case time complexity of O(n^2)?

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Which of the following sorting algorithm has best case time complexity of O(n^2)?

(a) bubble sort

(b) selection sort

(c) insertion sort

(d) stupid sort

This question was posed to me in semester exam.

This interesting question is from Recursion topic in section Recursion of Data Structures & Algorithms II

1 Answer

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Correct choice is (b) selection sort

For explanation: Selection sort is not an adaptive sorting algorithm. It finds the index of minimum element in each iteration even if the given array is already sorted. Thus its best case time complexity becomes O(n^2).

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