How to Add Multiple Key-Value Pairs to a Map in C++?

In C++, a map is a container that stores elements in key-value pairs, where each key is unique and associated with a value. In this article, we will learn how to add multiple key-value pairs to a map in C++.

Example:

Input:
myMap = { {1, "one"} };
Elements to be insert = { {2, "two"}, {3, "three"}}Output:
myMap = {{1, "one"}, {2, "two"}, {3, "three"}}

Map Multiple Key-Value Pairs in C++

To map multiple key-value pairs to a std::map in C++, we can use the std::map::insert function that inserts key-value pairs into the map. The insert function can take a pair, a range of pairs, or an initializer list of pairs. Here, we will insert the range of pairs defined in the initializer list.

C++ Program to Map Multiple Key-Value Pairs

Map after adding multiple key-value pairs:
1 => one
2 => two
3 => three

Time Complexity: O(M logN), where M is the number of new pairs and N is the size of the map.
Auxiliary Space: O(M)