using System;

using System.Collections.Generic;

using System.IO;

​

public class Student

{

      private string firstName;

      private string lastName;

      public Student(string firstName, string lastName)

      {

            this.firstName = firstName;

            this.lastName = lastName;

      }

      public string Name

      {

            get

            {

                  return this.firstName + " " + this.lastName;

            }

      }

​

}

​

​

public class Group

{

      private string name;

      private List<Student> students;

      public Group(string name)

      {

            this.name = name;

            this.students = new List<Student>();

      }

      public string Name

      {

            get

            {

                  return this.name;

            }

      }

      public IEnumerable<Student> Students

      {

            get

            {

                  return this.students;

            }

      }

      public void AddStudent(Student student)

      {

            students.Add(student);

      }

      public void PrintStudents(TextWriter output)

      {

            output.WriteLine("Group name: {0}", this.Name);

            output.WriteLine("Students in group:");

            foreach (Student student in this.Students)

            {

                  output.WriteLine("Name: {0}", student.Name);

            }

      }

}

​

​

public class Teacher

{

      private string firstName;

      private string lastName;

      private List<Group> groups;

      public Teacher(string firstName, string lastName)

      {

            this.firstName = firstName;

            this.lastName = lastName;

            this.groups = new List<Group>();

      }

      public void AddGroup(Group group)

      {

            this.groups.Add(group);

      }

      public void PrintGroups(TextWriter output)

      {

            output.WriteLine("Teacher name: {0} {1}", this.firstName,

                  this.lastName);

            output.WriteLine("Groups of teacher:");

            foreach (Group group in this.groups)

            {

                  group.PrintStudents(output);

            }

      }

}

​

public class School

{

      private string name;

      private List<Teacher> teachers;

      private List<Group> groups;

      private List<Student> students;

      public School(string name) {

            this.name = name;

            this.teachers = new List<Teacher>();

            this.groups = new List<Group>();

            this.students = new List<Student>();

      }

      public string Name()

      {

            return name;

      }

      public IEnumerable<Teacher> Teachers

      {

            get

            {

                  return this.teachers;

            }

      }

      public void AddTeacher(Teacher teacher)

      {

            teachers.Add(teacher);

      }

      public void AddGroup(Group group)

      {

            groups.Add(group);

            foreach (Student student in group.Students)

            {

                  if(!this.students.Contains(student))

                  {

                        this.students.Add(student);

                  }

            }

      }

}

​

public class SchoolTest

{

      public static void AddObjectsToSchool(School school)

      {

            Teacher teacherTomcheva = new Teacher("Елисавета",

                  "Томчева");

                        school.AddTeacher(teacherTomcheva);

            Teacher teacherLazarova = new Teacher("Ива" , "Лазарова");

                        school.AddTeacher(teacherLazarova);

            Teacher teacherGeleva = new Teacher("Ирена", "Гелева");

                        school.AddTeacher(teacherGeleva);

            // Add the English group

            Group groupEnglish = new Group("английски език");

            groupEnglish.AddStudent(new Student("Надежда", "Иванова"));

            groupEnglish.AddStudent(new Student("Васил", "Тодоров"));

            groupEnglish.AddStudent(new Student("Елена", "Георгиева"));

            groupEnglish.AddStudent(new Student("Георги", "Георгиев"));

            school.AddGroup(groupEnglish);

            teacherLazarova.AddGroup(groupEnglish);

            // Add the Russian group

            Group groupRussian = new Group("руски език");

            groupRussian.AddStudent(new Student("Петър", "Петров"));

            groupRussian.AddStudent(new Student("Живко", "Василев"));

            groupRussian.AddStudent(new Student("Петко", "Христов"));

            groupRussian.AddStudent(new Student("Габи", "Иванова"));

            school.AddGroup(groupRussian);

            teacherTomcheva.AddGroup(groupRussian);

            // Add the Bulgarian group

            Group groupBulgarian = new Group("български език");

            groupBulgarian.AddStudent(new Student("Анелия", "Илиева"));

            groupBulgarian.AddStudent(new Student("Марио", "Златев"));

            groupBulgarian.AddStudent(new Student("Ивелина", "Горанова"));

            groupBulgarian.AddStudent(new Student("Христо", "Панайотов"));

            school.AddGroup(groupBulgarian);

            teacherGeleva.AddGroup(groupBulgarian);

      }

      public static void Main() {

            School school = new School("Васил Левски");

            AddObjectsToSchool(school);

            foreach(Teacher teacher in school.Teachers)

            {

                  teacher.PrintGroups(Console.Out);

                  Console.WriteLine();

            }

      }

}