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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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