set empty() in C++

empty(): This is a build-in function in STL. This function returns true if the set is empty. 

This function is available in the below file.

File: stl_set.h

Parameters: No parameters are required for this function.

Syntax:

st.empty()

For Example:

st = {1,2,3,4}

st.empty() = > It returns 0 because set is not empty.

Approach

C++

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

int main()
{
    set<int> st;
    st.insert(4);
    st.insert(2);
    st.insert(3);
    st.insert(1);

    cout << st.empty() << "\n";

    return 0;
}