What are comparators in C++ STL?

What are comparators in C++ STL?

Comparators in C++ STL are functions or function objects that define a custom ordering for elements in containers.

Can you give me an example of a comparator?

Sure! A simple comparator could be a function that compares two integers and returns true if the first is less than the second.

How do I use a custom comparator with a sort function?

You can pass your comparator as the second argument to the std::sort function, like this: std::sort(vec.begin(), vec.end(), myComparator);

What about using lambda expressions for comparators?

You can use lambda expressions directly in std::sort, for example: std::sort(vec.begin(), vec.end(), [](int a, int b) { return a < b; });.