#include <iostream>
#include <string>
#include <vector>

struct Student
{
    int albumID;
    std::string name;
    std::string forename;
    int rok;
    int wiek;
};

std::ostream & operator<<(std::ostream & out, const Student & student)
{
    out << student.albumID << ": " << student.name << " " << student.forename << " " << student.rok << " " << student.wiek;
    return out;
}

void addStudent(std::vector<Student> & students)
{
    Student newStudent;
    if (students.size() == 0)
        newStudent.albumID = 1;
    else
        newStudent.albumID = students[students.size() - 1].albumID + 1;

    std::cout << "Podaj imie: ";
    std::cin >> newStudent.name;
    std::cout << "Podaj nazwisko: ";
    std::cin >> newStudent.forename;
    std::cout << "Podaj rok: ";
    std::cin >> newStudent.rok;
    std::cout << "Podaj wiek: ";
    std::cin >> newStudent.wiek;

    students.push_back(newStudent);
}

void wyswietlStudentowZRoku(const std::vector<Student> & students, int rok)
{
    for(auto x : students)
        if (x.rok == rok)
            std::cout << x;
}

int liczbaStudentow(const std::vector<Student> & students)
{
    return students.size();
}

int main()
{
    std::vector<Student> students;

}