Database Students (Simple)

#include <algorithm>
#include <array>
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
struct Student {
    array<int, 5> list{};
    string id;
    string name;
    Student() = default;
    Student(const array<int, 5>& list, const string& id, const string& name)
        : list(list), id(id), name(name) {}
    bool advanced(const int lower_limit)const {
        for (auto score : list) {
            if (score < lower_limit) return false;
        }
        return true;
    }
    void show()const {
        cout << id << ' ' << name << " = ";
        for (auto score : list) cout << score << ' ';
        puts("");
    }
private:
    friend ostream& operator<<(ostream& out, const Student& s) {
        out << s.id << '\n' << s.name << '\n';
        for (auto score : s.list) out << score << ' ';
        out.put('\n');
        return out;
    }
    friend bool operator<(const Student& a, const Student& b) {
        return a.name < b.name;
    }
};
class Students {
public:
    void add(const Student& student) {
        students.push_back(student);
    }
    void add(Student&& student)noexcept {
        students.emplace_back(student);
    }
    bool load(const string& path) {
        ifstream inp(path);
        if (!inp.is_open()) return false;
        students.clear();
        Student s;
        string res;
        while (getline(inp, s.id) && getline(inp, s.name) && getline(inp, res)) {
            istringstream iss(res);
            int score;
            size_t i = 0;
            while (iss >> score) {
                s.list[i] = score;
                ++i;
            }
            students.push_back(s);
        }
        inp.close();
        return true;
    }
    bool save(const string& path) {
        ofstream out(path);
        if (!out.is_open()) return false;
        for (const auto& student : students) out << student;
        out.close();
        return true;
    }
    Students select(const int lower_limit)const {
        Students eag;
        for (const auto& student : students) {
            if (student.advanced(lower_limit)) eag.add(student);
        }
        return eag;
    }
    void streamline() {
        sort(students.begin(), students.end());
    }
    void show()const {
        for (const auto& student : students) student.show();
    }
private:
    vector<Student> students;
};
int main() {
    system("chcp 1251 > nul");
    const string path{ "students.txt" };
    Students students;
    if (!students.load(path)) {
        students.add(Student(array<int, 5>({ 5, 4, 5, 4, 4 }), "A4285", "Фролова А. Н."));
        students.add(Student(array<int, 5>({ 4, 5, 4, 4, 5 }), "A4286", "Иванов И. С."));
        students.add(Student(array<int, 5>({ 3, 4, 4, 4, 4 }), "A4287", "Зайцева Е. Ф."));
        students.add(Student(array<int, 5>({ 4, 5, 5, 5, 4 }), "A4288", "Королёв Е. Р."));
        students.add(Student(array<int, 5>({ 4, 3, 3, 4, 3 }), "A4289", "Титов И. В."));
        students.add(Student(array<int, 5>({ 5, 4, 5, 5, 4 }), "A4290", "Егорова А. И."));
        students.add(Student(array<int, 5>({ 3, 3, 4, 4, 5 }), "A4292", "Смирнова О. Г."));
        students.add(Student(array<int, 5>({ 4, 4, 5, 4, 4 }), "A4293", "Павлов В. И."));
        students.add(Student(array<int, 5>({ 5, 5, 5, 5, 5 }), "A4294", "Кац С. Я."));
        students.add(Student(array<int, 5>({ 4, 5, 5, 4, 3 }), "A4296", "Новикова Г. Э."));
        students.save(path);
    }
    auto excellent = students.select(4);
    excellent.streamline();
    excellent.save("excellent.txt");
    excellent.show();
    system("pause > nul");
}