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    Question

    In which case is QuickSort’s performance

    worst?
    A Random array Correct Answer Incorrect Answer
    B Already sorted array Correct Answer Incorrect Answer
    C Reverse sorted array Correct Answer Incorrect Answer
    D Both B and C Correct Answer Incorrect Answer
    E None of the above Correct Answer Incorrect Answer

    Solution

    QuickSort degrades to O(n²) when the pivot divides the array unevenly, such as in sorted or reverse-sorted arrays.

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