private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) {
	std::vector<int> courses;
	std::vector<int> boys;
	std::vector<int> general_number;
	std::vector<int> boys_per_cent;
	std::vector<std::string> boys_names;
	std::vector<std::string> girls_names;
	std::vector<int> boys_names_numbers;
	std::vector<int> girls_names_numbers;
	std::vector<std::string> groups;
	std::vector<int> average_marks;

	for (int i = 0; i < students.size(); i++) {
		int resp = check_course(students[i].course, courses);
		if (resp == 0) {
			courses.push_back(students[i].course);
		}

		if (students[i].course == 1) {
			resp = check_name(students[i].group, groups);
			if (resp == 0) {
				groups.push_back(students[i].group);
			}
			int index = get_name_index(students[i].group, groups);
			int size = average_marks.size() - 1;
			if (size  < index) {
				average_marks.push_back(0);
			}
			float sum = 0;
			for (int m = 0; m < students[i].marks.size(); m++) {
				sum += students[i].marks[m];
			}
			sum = sum / 5;
			average_marks[index] += sum;
		}

		if (students[i].sex == 1) {
			resp = check_name(students[i].first_name, boys_names);
			 if (resp == 0) {
				 boys_names.push_back(students[i].first_name);
			}
			 int index = get_name_index(students[i].first_name, boys_names);
			 int size = boys_names_numbers.size() - 1;
			 if (size  < index) {
				 boys_names_numbers.push_back(0);
			 }
			 boys_names_numbers[index]++;
		}
		else{
			resp = check_name(students[i].first_name, girls_names);
			if (resp == 0) {
				girls_names.push_back(students[i].first_name);
			}
			int index = get_name_index(students[i].first_name, girls_names);
			int size = girls_names_numbers.size() - 1;
			if (size  < index) {
				girls_names_numbers.push_back(0);
			}
			girls_names_numbers[index]++;
		}
		std::vector<int>::iterator it = std::find(courses.begin(), courses.end(), students[i].course);
		int index = std::distance(courses.begin(), it);
		int boys_size = boys.size() - 1;
		if (boys_size  < index) {
			boys.push_back(0);
			general_number.push_back(0);
		}
		if (students[i].sex == 1) {
			boys[index]++;

		}
		general_number[index]++;
	}
	int percent = 0, max_percent_index, max_percent = 0;
	for (int i = 0; i < boys.size(); i++) {
		percent = boys[i] / general_number[i];
		if (max_percent < percent) {
			max_percent = percent;
			max_percent_index = i;
		}
	}
	std::string names = "";
	int max = 0;
	if (boys_names_numbers.size() > 0) {
		for (int i = 0; i < boys_names_numbers.size(); i++) {
			if (boys_names_numbers[max] < boys_names_numbers[i]) {
				max = i;
			}
		}
		names += boys_names[max] + "   ";
		max = 0;
	}
	if (girls_names_numbers.size() > 0) {
		for (int i = 0; i < girls_names_numbers.size(); i++) {
			if (girls_names_numbers[max] < girls_names_numbers[i]) {
				max = i;
			}
		}
		names += girls_names[max];
	}
	std::string groups_names  = "";
	for (int i = 0; i < average_marks.size(); i++) {
		int max_pos = 0;
		for (int k = 0; k < average_marks.size(); k++) {
			if (average_marks[k] > average_marks[max_pos]) {
				max_pos = k;
			}
		}
		if (average_marks[max_pos] == -1)
			continue;

		groups_names += groups[max_pos] + ", ";
		average_marks[max_pos] = -1;
	}
	textBox9->Text = System::Convert::ToString(courses[max_percent_index]);
	textBox10->Text = marshal_as<String^>(names);
	textBox11->Text = marshal_as<String^>(groups_names);
}