What is a stable sorting algorithm?

Stable sorting algorithms maintain the relative order of records with equal keys (i.e. values). That is, a sorting algorithm is stable if whenever there are two records R and S with the same key and with R appearing before S in the original list, R will appear before S in the sorted list.

When can a sorting algorithm be 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. Informally, stability means that equivalent elements retain their relative positions, after sorting.

Is QuickSort a stable sorting algorithm?

No
Quicksort/Stable

Is insertion sort a stable algorithm?

Yes
Insertion sort/Stable

Which algorithm is not a stable sorting algorithm?

Explanation: Out of the given options quick sort is the only algorithm which is not stable. Merge sort is a stable sorting algorithm.

What is stable sorting give an example?

Stable sorting algorithm A sorting algorithm is said to be stable if the order of the same values in the output remains the same as in input array. This is an example of stable sorting, element 12 appears twice at index 5 and at index 7.

What are unstable algorithms?

If a sorting algorithm is said to be “unstable”, this means that for any items that rank the same, the order of the tied members is not guaranteed to stay the same with successive sorts of that collection. For a ‘stable’ sort, the tied entries will always end up in the same order when sorted.

What are stable and unstable algorithms?

Stability in Sorting Algorithms Stable sorting algorithms preserve the relative order of equal elements, while unstable sorting algorithms don’t. In other words, stable sorting maintains the position of two equals elements relative to one another.

What does it mean for a sorting algorithm to be “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 unsorted array. Some sorting algorithms are stable by nature like Insertion sort, Merge Sort, Bubble Sort, etc. And some sorting algorithms are not, like Heap Sort, Quick Sort, etc.

What is the worst sorting algorithm?

Answer Wiki. 6 Answers. Any sorting algorithm with O(n^2)[n-square] is the worst sorting algorithms there are bubblesort,insertion,selection,treesort etc and many have there worst case complexity as O(n^2) please refer the below chat for any douts.

What is the stability of sorting algorithms?

Stable Sorting Algorithms Overview. In this tutorial, we’ll learn what stable sorting algorithms are and how they work. Stability in Sorting Algorithms. The stability of a sorting algorithm is concerned with how the algorithm treats equal (or repeated) elements. When Stability Matters. Stable and Unstable Sorting Algorithms. Conclusion.

What are the best sorting algorithms?

Sorting algorithms are often classified by: Computational complexity (worst, average and best behavior) in terms of the size of the list (n). For typical serial sorting algorithms good behavior is O(n log n), with parallel sort in O(log2 n), and bad behavior is O(n2).