Как вывести все данные?

Не могу отсортировать продавцов по фамилии, а также не получается вывести всех продавцов (выводятся только 2). На Java сделала с помощью Collections, а вот по С++ не знаю. Заранее спасибо.

Код:

#include <iostream>
#include <string>

class Vanzator
{
private:

    std::string m_id;
    std::string m_FirstName;
    std::string m_LastName;
    int m_age;
    std::string m_expereenta;

public:

    Vanzator(std::string id, std::string FirstName, std::string LastName, int age, std::string expereenta)
    {
        m_id = id;
        m_FirstName = FirstName;
        m_LastName = LastName;
        m_age = age;
        m_expereenta = expereenta;
    }

    //Inceputul blocului cu functii get...
    std::string getId()
    {
        std::cout << m_id << std::endl;;
        return m_id;
    }

    std::string getFirstName()
    {
        std::cout << m_FirstName << std::endl;;
        return m_FirstName;
    }

    std::string getLastName()
    {
        std::cout << m_LastName << std::endl;;
        return m_LastName;
    }

    int getAge()
    {
        std::cout << m_age << std::endl;;
        return m_age;
    }

    std::string getExpereenta()
    {
        std::cout << m_expereenta << std::endl;;
        return m_expereenta;
    }
    //Sfarsitul blocului cu functii get...


    //Inceputul blocului cu functii set...
    void setId(std::string id)
    {
        m_id  = id;
    }

    void setFirstName(std::string firstName)
    {
        m_FirstName = firstName;
    }

    void setLastName(std::string lastName)
    {
        m_LastName = lastName;
    }

    void setAge(int age)
    {
        m_age = age;
    }

    void setExpereenta(std::string expereenta)
    {
        m_expereenta = expereenta;
    }
    //Sfarsitul blocului cu functii set...

    std::string toString()
    {
        std::cout << "nVanzator {" << std::endl;
        std::cout << "tid = " << m_id << std::endl;
        std::cout << "tFirstName = " << m_FirstName << std::endl;
        std::cout << "tLastName = " << m_LastName << std::endl;
        std::cout << "tage = " << m_age << std::endl;
        std::cout << "tExpereenta = " << m_expereenta << std::endl;
        std::cout << "}" << std::endl;

    }


};


kkk#include <iostream>
#include <string>

class Vanzator
{
private:

    std::string m_id;
    std::string m_FirstName;
    std::string m_LastName;
    int m_age;
    std::string m_expereenta;

public:

    Vanzator(std::string id, std::string FirstName, std::string LastName, int age, std::string expereenta)
    {
        m_id = id;
        m_FirstName = FirstName;
        m_LastName = LastName;
        m_age = age;
        m_expereenta = expereenta;
    }

    //Inceputul blocului cu functii get...
    std::string getId()
    {
        std::cout << m_id << std::endl;;
        return m_id;
    }

    std::string getFirstName()
    {
        std::cout << m_FirstName << std::endl;;
        return m_FirstName;
    }

    std::string getLastName()
    {
        std::cout << m_LastName << std::endl;;
        return m_LastName;
    }

    int getAge()
    {
        std::cout << m_age << std::endl;;
        return m_age;
    }

    std::string getExpereenta()
    {
        std::cout << m_expereenta << std::endl;;
        return m_expereenta;
    }
    //Sfarsitul blocului cu functii get...


    //Inceputul blocului cu functii set...
    void setId(std::string id)
    {
        m_id  = id;
    }

    void setFirstName(std::string firstName)
    {
        m_FirstName = firstName;
    }

    void setLastName(std::string lastName)
    {
        m_LastName = lastName;
    }

    void setAge(int age)
    {
        m_age = age;
    }

    void setExpereenta(std::string expereenta)
    {
        m_expereenta = expereenta;
    }
    //Sfarsitul blocului cu functii set...

    std::string toString()
    {
        std::cout << "nVanzator {" << std::endl;
        std::cout << "tid = " << m_id << std::endl;
        std::cout << "tFirstName = " << m_FirstName << std::endl;
        std::cout << "tLastName = " << m_LastName << std::endl;
        std::cout << "tage = " << m_age << std::endl;
        std::cout << "tExpereenta = " << m_expereenta << std::endl;
        std::cout << "}" << std::endl;

    }


};


main()
{
    
Vanzator Vanzator1("0001884125", "Maxim", "Bortinlov", 25, "2 ani");
    
Vanzator Vanzator2("0001884572", "Anastasia", "Sumanova", 30, "5 ani");
   
 Vanzator Vanzator3("0001884424", "Grigorii", "Edganov", 24, "1 an");
 
   Vanzator Vanzator4("0001884354", "Leonid", "Samarov", 21, "3 luni");

    Vanzator1.toString(); //Afiseaza datele vanzatorului 1


    Vanzator2.setExpereenta("1.5 ani");

    Vanzator2.toString(); 
    Vanzator3.toString();
    Vanzator4.toString();

}