using System;

​

public class Program

{

    class kita

    {

            private char level;

            private int number;

            private int numOfStudents;

            private Talmid[] talmidim;

​

            public kita(char level, int number, int numOfStudents, Talmid[] talmidim)

            {

                this.level = level;

                this.number = number;

                this.numOfStudents = numOfStudents;

                this.talmidim = new Talmid[talmidim.length];

                for (int i = 0; i < talmidim.Length; i++)

                {

                    this.talmidim[i] = new Talmid(this.talmidim[i]);

                }

            }

            public kita(char level, int number)

            {

                this.level = level;

                this.number = number;

                Console.WriteLine("enter number of students");

                this.numOfStudents = int.Parse(Console.ReadLine());

                this.talmidim = new Talmid[this.numOfStudents];

                for (int i = 0; i < this.numOfStudents; i++)

                {

                    Console.WriteLine("enter name");

                    string name = Console.ReadLine();

                    int[] grades = new int[5];

                    for (int j = 0; j < 5; j++)

                    {

                        Console.WriteLine("enter grade");

                        grades[j] = int.Parse(Console.ReadLine());

                    }

                    Console.WriteLine("enter date");

                    Date b = new Date(int.Parse(Console.ReadLine()), int.Parse(Console.ReadLine()), int.Parse(Console.ReadLine()));

                    this.talmidim[i] = new Talmid(name, b, grades);

                }

​

            }

            public kita()

            {

                Console.WriteLine("what is the level");

                this.level = char.Parse(Console.ReadLine());

                Console.WriteLine("what is the number");

                this.number = int.Parse(Console.ReadLine());

                Console.WriteLine("enter number of students");

                this.numOfStudents = int.Parse(Console.ReadLine());

                this.talmidim = new Talmid[this.numOfStudents];

                for (int i = 0; i < talmidim.Length; i++)

                {

                    Console.WriteLine("enter name");

                    string name = Console.ReadLine();

                    int[] grades = new int[5];

                    for (int j = 0; j < 5; j++)

                    {

                        Console.WriteLine("enter grade");

                        grades[j] = int.Parse(Console.ReadLine());

                    }

                    Console.WriteLine("enter date");

                    Date b = new Date(int.Parse(Console.ReadLine()), int.Parse(Console.ReadLine()), int.Parse(Console.ReadLine()));

                    this.talmidim[i] = new Talmid(name, b, grades);

                }

            }

            public kita(kita k)

            {

                this.level = k.level;

                this.number = k.number;

                this.numOfStudents = k.numOfStudents;

                this.talmidim = new Talmid[this.numOfStudents];

                for (int i = 0; i < this.numOfStudents; i++)

                {

                    this.talmidim[i] = new Talmid(k.talmidim[i]);

                }

            }

            public char Getlevel()

            {

                return this.level;

            }

            public int Getnumber()

            {

                return this.number;

            }

        public int GetnumOfStudents()

            {

                return this.numOfStudents;

            }

            public Talmid[] Gettalmidim()

            {

​

            Talmid[] copy = new Talmid[this.numOfStudents];

            for (int i = 0; i < this.numOfStudents; i++)

            {

                copy[i] = new Talmid(this.talmidim[i]);

            }

            return copy;

            }

            public void Setlevel(char level)

            {

                this.level = level;

            }

            public void Setnumber(int number)

            {

                this.number = number;

            }

            public void SetnumOfStudents(int numOfStudents)

            {

                this.numOfStudents = numOfStudents;

            }

            public void SetTalmidim(Talmid[] talmidim)

            {

                for (int i = 0; i < this.numOfStudents; i++)

                {

                    this.talmidim[i] = new Talmid(talmidim[i]);

                }

            }

            public Talmid Beststudent()

            {

            double[] avg = new double[this.numOfStudents];

            for (int i = 0; i < this.numOfStudents; i++)

            {

                avg[i] = 0;

            }

            for (int i = 0; i < this.numOfStudents; i++)

            {

                for (int j = 0; j < 5; j++)

                {

                    avg[i] += this.talmidim[i].GetGrades()[j];

                }

                avg[i] = avg[i] / 5.0;

            }

            double max = 0, maxi;

            for (int i = 0; i < this.numOfStudents; i++)

            {

​

                if (max < avg[i])

                {

                    max = avg[i];

                    maxi = i;

                }

            }

            return this.talmidim[maxi];

​

            public bool IsStudentInClass(Talmid st)

            {

                for (int i = 0; i < this.numOfStudents; i++)

                {

                    if (st.GetName()==this.talmidim[i].GetName()())

                        return true;

                }

                return false;

            }

            public bool AddStudent(Talmid stu)

            {

                for (int i = 0; i < this.numOfStudents; i++)

                {

                    if (this.talmidim[i] == null)

                    {

                        this.talmidim[i] = stu;

                        return true;

                    }

                }

                return false;

            }

            public override string ToString()

            {

                string r = "level: " + this.level + ", number: " + this.number + "number of students: " + this.numOfStudents + ".";

                for (int i = 0; i < this.numOfStudents; i++)

            {

                r += this.talmidim[i].ToString();

            }

                return r;

            }

​

​

    }

​

    public static void Main()

    {

            //1

        Talmid[] t1 = new Talmid[20];

            kita k1 = new kita();

            kita k2 = new kita(k1);

            //2

            Console.WriteLine(k1);

            Console.WriteLine(k2);

            //3

            Console.WriteLine(k1.GetnumOfStudents());

            Console.WriteLine(k2.GetnumOfStudents());

            //4

            Talmid t1 = new Talmid();

            Talmid t2 = new Talmid();

            Talmid t3 = new Talmid();

            k1.AddStudent(t1);

            k1.AddStudent(t2);

            k2.AddStudent(t3);

            Console.WriteLine(k1);

            Console.WriteLine(k2);

            //5

            Console.WriteLine(k1.Beststudent());

            Console.WriteLine(k2.Beststudent());

            //6

            string name = Console.ReadLine();

            Date birth = new Date();

            int[] grades = new int[5];

            for (int i = 0; i < 5; i++)

            {

                Console.WriteLine("enter grades");

                grades[i] = int.Parse(Console.ReadLine());

            }

            Talmid t4 = new Talmid(name, birth, grades);

            if (k1.IsStudentInClass(t4) || k2.IsStudentInClass(t4))

                Console.WriteLine("he exist");

            else

                Console.WriteLine("he doesn't exist");

            //7

            int countlevi = 0, countcohen = 0;

            for (int i = 0; i < k1.GetnumOfStudents(); i++)

            {

                if (k1.Gettalmidim()[i].GetName().IndexOf("levi")!=-1)

                    countlevi++;

                if (k1.Gettalmidim()[i].GetName().Contains("cohen"))

                    countcohen++;

            }

            for (int i = 0; i < k2.GetnumOfStudents(); i++)

            {

                if (k2.Gettalmidim()[i].GetName().Contains("levi"))

                    countlevi++;

                if (k2.Gettalmidim()[i].GetName().Contains("cohen"))

                    countcohen++;

            }

            Console.WriteLine(countlevi + " students have levi in their name");

            Console.WriteLine(countcohen + " students have cohen in their name");

            //8

            double avg = 0;

            int count=0;

            for (int i = 0; i < k1.GetnumOfStudents(); i++)

            {

avg = 0;

                for (int j = 0; j < 5; j++)

                {

                    avg += k1.Gettalmidim()[i].GetGrades()[j];

                }

                if (avg / 5.0 < 55)

                    count++;

            }

        Console.WriteLine(count);

            //9

            avg = 0;

            double avg2 = 0;

            Talmid t5, t6;

            t5 = k1.Beststudent();

            t6 = k2.Beststudent();

            for (int i = 0; i < 5; i++)

            {

                avg += t5.GetGrades()[i];

                avg2 += t6.GetGrades()[i];

            }

            if(avg>avg2)

                Console.WriteLine(t5);

            else

                Console.WriteLine(t6);

            //10

            double avg = 0;

            int count = 0;

            for (int i = 0; i < k1.GetnumOfStudents(); i++)

            {

                for (int j = 0; j < 5; j++)

                {

                    avg+= k1.Gettalmidim()[i].GetGrades()[j];

                }

                if (avg / 5.0 > 85)

                    count++;

            }

            Console.WriteLine("there are " + count + " students that have above 85 averge");

        }        }

​

    }

}