Q: What is the difference between sort and stable sort?

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.

Q: What does std::sort do?

std::sort() is a built-in function in C++'s Standard Template Library. The function takes in a beginning iterator, an ending iterator, and (by default) sorts the iterable in ascending order. The function can also be used for custom sorting by passing in a comparator function that returns a boolean.

Question 1

Can you use std::sort with a list?

Accepted Answer

std::sort requires random access iterators and so cannot be used with list .

Question 2

Is std::list sorted?

Accepted Answer

std::list::sort. Sorts the elements in ascending order. The order of equal elements is preserved. The first version uses operator< to compare the elements, the second version uses the given comparison function comp .

Question 3

What is the difference between sort and stable sort?

Accepted Answer

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.

Question 4

What does std::sort do?

Accepted Answer

std::sort() is a built-in function in C++'s Standard Template Library. The function takes in a beginning iterator, an ending iterator, and (by default) sorts the iterable in ascending order. The function can also​ be used for custom sorting by passing in a comparator function that returns a boolean.

Is std::list<>::sort stable?

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c++

sorting

stl

Edouard A.

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