In C++ STL, a set is a container that stores unique elements in a sorted order. In this article, we will learn how to add an element to a set in C++ STL.

Example:

Input:
mySet = {1, 2, 4, 5, 8}
Element to add: 3

Output:
mySet = {1, 2, 3, 4, 5, 8}

Add an Element to a Set in C++

To add a specific element to a std::set in C++, we can use the std::set::insert() function. This function takes a value as an argument and inserts it into the set and maintains the set’s sorted order.

C++ Program to Add an Element to a Set

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Time Complexity: O(log n), where n is the number of elements in the set.
Auxiliary Space: O(1)

We can also elements to the set by using the emplace() function.