#include <iostream>
#include <list>
#include <string>
#include <algorithm>
 
using namespace std;
 
struct Student {
    string surname;
    int course;
    int mathan;
    int algebra;
};
 
bool compareBySurname(const Student& a, const Student& b) {
    return a.surname < b.surname;
}
 
bool compareByCourse(const Student& a, const Student& b) {
    return a.course < b.course;
}
 
bool hasLowGrades(const Student& s) {
    return s.mathan < 60 || s.algebra < 60;
}
 
 
void printList(const list<Student>& lst) {
    list<Student>::const_iterator it;
    for (it = lst.begin(); it != lst.end(); ++it) {
        cout << it->surname << "  курс " << it->course
             << "  mathan - " << it->mathan
             << "  algebra - " << it->algebra << endl;
    }
    cout << endl;
}
 
int main() {
    list<Student> students = {
        {"Іваненко", 1, 75, 82},
        {"Петренко", 2, 91, 88},
        {"Сидоренко", 1, 58, 64},
        {"Бондар", 2, 67, 59},
        {"Коваль", 1, 45, 51},
        {"Ткаченко", 2, 88, 79},
        {"Литвин", 1, 62, 65}
    };
 
    cout << "📋 Початковий список студентів:\n";
    printList(students);
 
    students.sort(compareBySurname);
    cout << "🔤 Відсортовано за прізвищем (compareBySurname):\n";
    printList(students);
 
 
    students.sort(compareByCourse);
    cout << "🎓 Відсортовано за курсом (compareByCourse):\n";
    printList(students);
 
    cout << "Після переведення на наступний курс (mathan > 60 && algebra > 60):\n";
    printList(students);
 
 
    students.remove_if(hasLowGrades);
    cout << "❌ Після видалення студентів з оцінками < 60:\n";
    printList(students);
 
    return 0;
}

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