#include <iostream>
#include <vector>
#include <algorithm>
#include <fstream>

template<typename container>
void print(container cont) {
    for (const auto& a : cont) {
        std::cout << a;
    }
    std::cout << std::endl;
}

struct student {
    std::string name;
    std::string surname;
    int course; // от 1 до 5
    int rating; // до 100
    double average_score; // до 5
};


std::ostream& operator<<(std::ostream& output, const student& st) {
    output << st.name << " " << st.surname << " " << st.course << " " << st.rating << " " << st.average_score << std::endl;
    return output;
}

std::istream& operator>>(std::istream& input, student& st) {
    input >> st.name >> st.surname >> st.course >> st.rating >> st.average_score;
    return input;
}

int main() {

    setlocale(LC_ALL, "ru");

    //std::vector<student> students{ {"Иван", "Иванов", 1, 33, 3.7}, {"Владимир", "Михайлов", 3, 39, 3.9}, {"Геннадий", "Петров", 2, 56, 4.2}, {"Ольга", "Григорьева", 5, 48, 4.0}, {"Елена", "Гришина", 4, 75, 4.9} };


    std::ifstream fin("students.txt");

    std::ofstream fout("temp.txt");

    if (!fin.is_open() || !fout.is_open()) {
        std::cout << "Ошибка открытия файла";
    }
    else {

        std::vector<student> students;

        student temp;

        while (!fin.eof()) {
            fin >> temp;
            students.push_back(temp);
        }

        print(students);

        std::sort(students.begin(), students.end(), [](const student& left, const student& right) { return left.surname < right.surname; });

        print(students);

        std::sort(students.begin(), students.end(), [](const student& left, const student& right) { return left.rating > right.rating; });

        print(students);

        std::sort(students.begin(), students.end(), [](const student& left, const student& right) { return left.average_score > right.average_score; });

        print(students);

        for (auto a : students) {
            fout << a;
        }

        fin.close();
        fout.close();

        std::remove("students.txt");
        std::rename("temp.txt", "students.txt");
    }


}