class

#include <iostream>
#include <vector>

using namespace std;

class User
{
    string status = "Gold";

    public:
        string first_name;
        string last_name;
        string get_status()
        {
            return status;
        }

};

int add_user_if_not_exists(vector<User> &users, User user)
{
    for (int i = 0; i < users.size(); i++)
    {
        if (users[i].first_name == user.first_name &&
            users[i].last_name == user.last_name)
        {
            return i;
        }
    }
    //users.push_back(user);
    return users.size() - 1;
}

int main()
{
    User user1, user2, user3;
    user1.first_name = "Sally";
    user1.last_name = "Swan";

    user2.first_name = "Jake";
    user2.last_name = "Johnson";

    user3.first_name = "Caleb";
    user3.last_name = "Curry";


    vector<User> users;
    users.push_back(user1);
    users.push_back(user2);
    users.push_back(user3);

    User user;
    user.first_name = "Jake";
    user.last_name = "Johnson";

    cout << add_user_if_not_exists(users, user);
    return 0;
}