unordered_set size() in C++

size(): This function is available in the File: unordered_set.h. This function is a build-in function in STL of C++. This function returns the number of elements in the unordered_set.

Syntax:

std::size_t std::unordered_set<int>::size() const

This function returns the size of the unordered_set.

Parameters: NA

File: unordered_set.h

Approach

C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
    unordered_set<int> st = {1, 2, 3, 4, 5};

    cout << st.size() << "\n";
    return 0;
}

Output:

5