set insert() in C++

insert(): This function is a build-in function in STL. This function attempts 

to insert a list of elements into the set.

Parameters:

__l – A std::initializer_list<value_type> of elements to be inserted. 

Complexity is similar to that of the range constructor.

Syntax:

st.insert(__l)

For Example:

st.insert({1,4,5,6,1,2}) = > Set becomes ={1,2,4,5,6}

Approach

C++

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

int main()
{
    set<int> st;

    st.insert({1, 4, 5, 6, 1, 2});

    for (auto it = st.begin(); it != st.end(); it++)
        cout << *it << " ";

    return 0;
}