What is the C++11 std::multiset?

Can you explain what std::multiset is in C++11?

Sure! std::multiset is an associative container that allows multiple elements with equivalent keys. It stores elements in a sorted order.

How does it differ from std::set?

The main difference is that std::set only allows unique elements, while std::multiset can store duplicate values.

Can you give me an example of how to use std::multiset?

Of course! Here's a simple example:

#include <iostream>
#include <set>

int main() {
    std::multiset<int> ms;
    ms.insert(5);
    ms.insert(1);
    ms.insert(5);
    for (int x : ms) {
        std::cout << x << ' ';
    }
}

This will output: 1 5 5.

What are some common use cases for std::multiset?

Common use cases include counting occurrences of elements, maintaining a sorted list of items, and implementing priority queues.