When is quicksort stable

Count of elements which are not at the correct position. How do you make a selection sort stable? Selection sort can be made Stable if instead of swapping, the minimum element is placed in its position without swapping i. In simple terms use a technique like insertion sort which means inserting element in its correct place. How does selection sort work? Selection sort is a simple sorting algorithm.

The smallest element is selected from the unsorted array and swapped with the leftmost element, and that element becomes a part of the sorted array. This process continues moving unsorted array boundary by one element to the right. Is bucket sort stable? Bucket sort is stable, if the underlying sort is also stable, as equal keys are inserted in order to each bucket.

Counting sort works by determining how many integers are behind each integer in the input array A. What is complexity selection sort? In computer science, selection sort is a sorting algorithm, specifically an in-place comparison sort. It has O n2 time complexity, making it inefficient on large lists, and generally performs worse than the similar insertion sort.

How do I make a Quicksort stable? Of course, you can always just go through the array being sorted and add an extra key that is its place in the original array. Then the quicksort will be stable and you just go through and remove the extra key at the end. The condition is easy to figure out, just keep the raw order for equal elements.

Which sorting algorithm is best? Is heap sort stable? Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?

Learn more. Asked 1 month ago. Active 16 days ago. Viewed times. Improve this question. Avra Avra 7 7 bronze badges. If duplicate values are given as input, output will maintain given input order. Quick sort is not a stable algorithm because it swaps non-adjacent elements. Faisal Habib. Thank you.

Why is not stable please? Please check stackoverflow. Although you can make it stable by not implementing in the typical way. The code uses middle element as pivot. Also, compare positions to decide where to put.

Code simplifies a lot if we use last element as pivot. In case of last element, we can always push equal elements in the smaller list. Skip to content. Change Language. Related Articles. Table of Contents. Save Article. Improve Article. Like Article. Python code to implement Stable QuickSort. Base case.