Why is quicksort unstable

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Top 5 Websites for Coding Interview Preparation How to sort a Map by keys in Java 8 - Example Tuto Top 5 Courses to learn jQuery for Beginners in Top 5 Free Pandas Courses for Beginners to learn i What is stable sort example? It also does far fewer comparison than NLog N in case input array is partially sorted. Which sorting is stable? A sorting algorithm is said to be stable if two objects with equal keys appear in the same order in sorted output as they appear in the input array to be sorted.

How can Selection sort be improved? A sorting algorithm that slightly improves on selection sort A sorting algorithm that slightly improves on selection sort. Merge two sorted arrays in constant space using Min Heap. Minimum increment or decrement operations required to make the array sorted. Find the first N pure numbers. 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. Making it stable either requires order N storage as in a naive implementation or a bit of extra logic for an in-place version.

In below implementation, we use extra space. The idea is to make two separate lists: 1 First list contains items smaller than pivot. 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. We could sort the list of words using this algorithm: stable sorting by column 5, then 4, then 3, then 2, then 1.

In the end, it will be correctly sorted. Convince yourself of that. Now to answer your question, suppose we have a list of first and last names. We are asked to sort "by last name, then by first". We could first sort stable or unstable by the first name, then stable sort by the last name. After these sorts, the list is primarily sorted by the last name.