How to Insert Multiple Elements to a Multiset in C++?

In C++, a multiset is a container that stores elements in a specific order. Multiple elements can have the same values. In this article, we will learn how to insert multiple elements into a multiset in C++.

Example:

Input:
myMultiset = {1, 4, 5, 9};
ElementsToBeAdded = {2, 3, 4}

Output:
myMultiset = {1, 2, 3, 4, 4, 5, 9}

Insert Multiple Elements to a Multiset in C++

To add multiple elements into a std::multiset in C++, you can use the std::multiset::insert() with iterators of the range from which you want to insert the elements.

Approach

1. Create a range of elements to insert, either using another container or using an initializer list.
2. Use the insert() function with the beginning and end iterators of the range to insert the elements into the multiset.

C++ Program to Insert Multiple Elements into a Multiset

C++

// C++ Program to show how to insert multiple elements into
// a multiset
#include <iostream>
#include <set>
#include <vector>
using namespace std;

// Driver Code
int main()
{
    multiset<int> myMultiset = { 10, 20, 30 };
    vector<int> elements = { 40, 60, 50 };

    // Insert a range of elements
    myMultiset.insert(elements.begin(), elements.end());

    // Display the multiset
    for (const auto& element : myMultiset) {
        cout << element << ' ';
    }

    return 0;
}

Output

10 20 30 40 50 60 

Time Complexity: O(M log N), where N is the size of the multiset and M is the number of new elements.
Space Complexity: O(M)