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In which scenario is Quick Sort likely to perform poorly?

Practice Questions

Q1
In which scenario is Quick Sort likely to perform poorly?
  1. When the array is already sorted
  2. When the array is in reverse order
  3. When the array has many duplicate elements
  4. When the array is small

Questions & Step-by-Step Solutions

In which scenario is Quick Sort likely to perform poorly?
  • Step 1: Understand what Quick Sort is. It is a sorting algorithm that divides an array into smaller parts (partitions) and sorts them.
  • Step 2: Know that Quick Sort picks a 'pivot' element from the array to help with the sorting.
  • Step 3: Realize that if the array is already sorted, Quick Sort may repeatedly choose the smallest or largest element as the pivot.
  • Step 4: When the pivot is always the smallest or largest, the partitions created will be very unbalanced, leading to poor performance.
  • Step 5: Understand that unbalanced partitions mean Quick Sort will take longer to sort the array, making it inefficient.
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