Others such as Quicksort, Heapsort and Selection Sort are unstable. A stable algorithm produces first output. And some sorting algorithms are not, like Heap Sort, Quick Sort, etc. QuickSort is an unstable algorithm because we do swapping of elements according to pivot's position without considering their original positions.
Quicksort is not stable but is an in-place algorithm. Heap sort is an in-place algorithm but is not stable. But Below is some of the slowest sorting algorithms: Stooge Sort: A Stooge sort is a recursive sorting algorithm. It recursively divides and sorts the array in parts. Quicksort is one of the most efficient sorting algorithms, and this makes of it one of the most used as well.
The first thing to do is to select a pivot number, this number will separate the data, on its left are the numbers smaller than it and the greater numbers on the right. You are correct that the outer loop iterates n times and the inner loop iterates n times as well, but you are double-counting the work.
The inner loop does O n work on each iteration, and the outer loop runs for O n iterations, so the total work is O n2. Bubble sort always takes one more pass over array to determine if it's sorted. Bubble sort does n comparisons on every pass. Insertion sort does less than n comparisons: once the algorithm finds the position where to insert current element it stops making comparisons and takes next element.
The bubble sort is a very memory-efficient because all of the ordering occurs within the array or list itself 7. No new memory is allocated 7. No new data structures are necessary, for the same reason. The bubble sort requires very little memory other than that which the array or list itself occupies. The only significant advantage that bubble sort has over most other algorithms, even quicksort, but not insertion sort, is that the ability to detect that the list is sorted efficiently is built into the algorithm.
When the list is already sorted best-case , the complexity of bubble sort is only O n. Bubble sort can be optimized by using a flag variable that exits the loop once swapping is done. The best complexity of a bubble sort can be O n.
O n is only possible if the array is sorted. Explanation: Optimised Bubble sort is one of the simplest sorting techniques and perhaps the only advantage it has over other techniques is that it can detect whether the input is already sorted.
It is faster than other in case of sorted array and consumes less time to describe whether the input array is sorted or not. Which of the following is not in place sorting algorithm? Explanation: An additional space of O n is required in order to merge two sorted arrays. If you like this interview question and my explanation then please share it with your friends and colleagues. If you have any questions or feedback then please drop a comment.
Share to Twitter Share to Facebook. Labels: data structure and algorithm , interview questions , Sorting algorithm. July 7, at AM javin paul said July 7, at AM Ned Horvath said October 19, at AM. Newer Post Older Post Home. Subscribe to: Post Comments Atom. Subscribe for Discounts and Updates Follow. Search This Blog. Interview Questions core java interview question data structure and algorithm 78 Coding Interview Question 75 interview questions 70 design patterns 35 SQL Interview Questions 34 object oriented programming 34 thread interview questions 30 spring interview questions 28 collections interview questions 25 database interview questions 16 servlet interview questions 15 Programming interview question 6 hibernate interview questions 6.
How to design a vending machine in Java? How HashMap works in Java? Why String is Immutable in Java? Translate This Blog. Top 5 Courses to become a Frontend Developer in 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. I think if u consider linear sort,its self explanatory.
But that's not the case in quick sort. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Why quick sort is unstable Ask Question. Asked 7 years, 10 months ago. Active 4 years, 4 months ago. Viewed 14k times.
Thank you. Improve this question.
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