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R-9.4 Give a pseudocode description of an in-place quick-select algorithm.

R-9.4 Give a pseudocode description of an in-place quick-select algorithm.

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Answer #1

Quick Select Algorithm is an version of Quick-Sort Algorithm. We use QuickSort to sort the list but Quick-Select is used to get the kth smallest element in list.

In this algorithm, after finding the pivot, Instead of partition both the sides again and again we partition only the side which will give us the element.

  • If index of pivot is less than k, we partition right part
  • If index of pivot is equal to k, we return element
  • If index of pivot is greater than k, we partition left part

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