using System;

 class setCharV

    { 

        //полета

        public byte[] elements; 

        public int size; 

​

        // конструктори

        public setCharV()

        { 

            size = 0; 

            elements = new byte[256]; 

        } 

        public setCharV(byte[] e, int s)

        { 

            this.size = s; 

            this.elements = new byte[256]; 

            if (this.size != 0) 

                for (int i = 0; i < s; i++) this.elements[e[i]] = 1;  //e[i] ечисло от 0 до 255. Използва се за индекс

        }

       // копиращ конструктор

        public setCharV(setCharV m)

        { 

            this.size = m.size; 

            this.elements = new byte[256]; 

            if (this.size != 0) 

                for (int i = 0; i < 256; i++) 

                    this.elements[i] = m.elements[i];

        }

        //методи

        public void Print() 

        { 

            Console.Write("{ "); 

            if (size != 0)

            { 

                int i = 0; 

                while (this.elements[i] == 0) i++;

                Console.Write("{0}",i); 

                i++; 

                for ( ; i < 256; i++)

                    { if (this.elements[i] == 1) Console.Write(", {0}", i); 

                }

            }

            Console.WriteLine(" }");

        }

        public setCharV Union(setCharV b)

        {

            setCharV c = new setCharV();

            for (int i = 0; i < 256; i++)

                if (this.elements[i] == 1 || b.elements[i] == 1)

                { c.elements[i] = 1; c.size++; } return c;

        }

        public setCharV Intersection(setCharV b)

        {

            setCharV c = new setCharV();

            for (int i = 0; i < 256; i++)

                if (this.elements[i] == 1 && b.elements[i] == 1)

                { c.elements[i] = 1; c.size++; } return c;

        }

      public setCharV Diff(setCharV b)

        {

            setCharV c = new setCharV();

            c.size=this.size;

            for (int i = 0; i < 256; i++)

                if (this.elements[i] == 1 && b.elements[i] == 1)

                { c.elements[i] = 0; c.size--; }

                else c.elements[i] = this.elements[i];

             return c;

        }

​

    }               

public class Program

{

    public static void Main()

    {

        byte[] arr1 = { 1, 2, 3, 5 };

            byte[] arr2 = { 1, 2, 3, 7, 8,9 };

            setCharV A = new setCharV(arr1, arr1.Length);

            setCharV B = new setCharV(arr2, arr2.Length);

            Console.WriteLine("Set A");

            A.Print();

            Console.WriteLine("\nSet B");

            B.Print();

            Console.WriteLine("\nA U B");

            setCharV C = new setCharV();

            C = A.Union(B);

            C.Print();

​

            setCharV D = new setCharV();

            Console.WriteLine("\nA n B");

            D = A.Intersection(B);

            D.Print();

            setCharV E = new setCharV();

            Console.WriteLine("\nA - B");

            E= A.Diff(B);

            E.Print();

            setCharV F = new setCharV();

            Console.WriteLine("\nB - A");

            F= B.Diff(A);

            F.Print();

    }

}