unordered_map<int, string> topic_index_to_title_map_new;

void change_mark(string login, int index_topic, int mark) {
    ifstream file;
    file.open("students.txt");

    int all_lines = 0;
    if (file.is_open()) {
        ofstream temp_file;
        temp_file.open("students_temp.txt", std::ios::app);
        string questions_to_replace = "";
        if (temp_file.is_open()) {
            string line;
            int login_divider = 13;
            while (getline(file, line)) {
                if (all_lines % login_divider == 0) {
                    string subbed_login = line.substr(2, line.length());
                    cout << subbed_login << endl;
                    if (login == subbed_login) {
                        cout << " marks for " << login << endl;
                        temp_file << line << '\n';
                        getline(file, line);
                        temp_file << line << '\n';
                        getline(file, line);
                        temp_file << line << '\n';
                        all_lines += 2;
                        int curr_topic_index = 0;

                        for (int i = 0; i < 8; i++) {
                            getline(file, line);
                            cout << "mark by " << topic_index_to_title_map_new[i] << " is " << line << endl;

                            if (i == index_topic) {
                                temp_file << to_string(mark) << '\n';
                                all_lines++;;
                                cout << "Change mark for " << topic_index_to_title_map_new[i] << " to " << mark << endl;
                            }
                            else {
                                temp_file << line << '\n';
                                all_lines++;;

                            }
                        }
                    }
                    else {
                        temp_file << line << '\n';
                        all_lines++;
                    }
                } else {
                    temp_file << line << '\n';
                    all_lines++;
                }
            }
            temp_file.close();
        }
    }

    file.close();
    ofstream file2("students.txt", ofstream::trunc);
    file2.close();

    ifstream file_orig_r("students.txt");
    string test_str;
    while (getline(file_orig_r, test_str)) {
        cout << " read from orig file after truncating " << test_str << endl;
    }

    ofstream origfile("students.txt", std::ios::app);

    ifstream temp_file_r("students_temp.txt");
    string temp_line;

    int curr_line = 0;
    while (getline(temp_file_r, temp_line)) {
        if (curr_line == all_lines) {
            cout << "-2 line is " << temp_line;
            origfile << temp_line;
        }
        else {
            origfile << temp_line << '\n';
        }
        curr_line++;
    }

    ofstream temp_file_n("students_temp.txt", ofstream::trunc);
    temp_file_n.close();

    temp_file_r.close();
    origfile.close();
}

topic_index_to_title_map_new[0] = "Loop";
    topic_index_to_title_map_new[1] = "Array";
    topic_index_to_title_map_new[2] = "String";
    topic_index_to_title_map_new[3] = "Recursion";
    topic_index_to_title_map_new[4] = "Struct";
    topic_index_to_title_map_new[5] = "File";
    topic_index_to_title_map_new[6] = "Pointers";
    topic_index_to_title_map_new[7] = "Dynamic";

    string login = "loginK9877";
    change_mark(login, 4, 3);