## Is STL sort stable?

A sorting algorithm is “**stable**” if, for two equivalent elements, it preserves their original order relative to each other. … As of September 2020, it appears that libc++ std::sort happens to be stable for all ranges of size less than 31, and libstdc++ std::sort happens to be stable for all ranges of size less than 17.

## Is C++ STL sort stable?

4 Answers. **Yes**, it’s as you said, and this is not a concept unique to C++. Stable sorts preserve the physical order of semantically equivalent values.

## Which is the most stable sorting procedures?

Several common **sorting algorithms** are **stable** by nature, such as Merge **Sort**, Timsort, Counting **Sort**, Insertion **Sort**, and Bubble **Sort**. Others such as Quicksort, Heapsort and Selection **Sort** are **unstable**. We can modify **unstable sorting algorithms** to be **stable**.

## Which sorting is best in C?

**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.

## How does Stable sort work?

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.

## What is stable sort in C++?

C++ Algorithm stable_sort() function is used to sort the elements in the range [first, last) into ascending order like sort but keeps the order of equivalent elements. The elements are compared using operator < for the first version, and comp for the second version.

## Which is the slowest sorting procedure?

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.