How to Access an Element in Set in C++?

In C++ STL (Standard Template Library), the set container represents a collection of unique, sorted elements. In this article, we will see how to an element in a set in C++ using iterators.

Example

Input:
mySet = {1, 8, 99, 444, 521 }

Output:
mySet Value at Index 2: 99

Access an Element in a Set in C++

We can use the set iterators provided by the function std::set::begin() to access the elements of a set. Iterators are like pointers, we can access any index value using this iterator by incrementing and decrementing.

Note: While using the iterator, be careful not to go out of bounds.

C++ Program to Access an Element in a Set using Iterators

Below is the Implementation of the above approach:

C++

// C++ program for accessing the element of the set using
// iterator
#include <iostream>
#include <iterator>
#include <set>
using namespace std;

int main()
{
    // Create set
    set<int> mySet;

    // Populate the set
    mySet.insert(10);
    mySet.insert(20);
    mySet.insert(30);
    mySet.insert(40);
    mySet.insert(50);

    // Using iterators access the desired element
    set<int>::iterator it = mySet.begin();
    it++;
    it++;
    // Print the desired element
    cout << "Third element in the set (Using Iterators): "
         << *(it) << endl;

    return 0;
}
// This code is contributed by Susobhan Akhuli

Output

Third element in the set (Using Iterators): 30

Time Complexity: O(logN)
Auxiliary Space: O(1)