/******************************************************************************

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*******************************************************************************/

using System;

​

public abstract class PatternPrinter {

    private int patternLength;

    public PatternPrinter(int patternLength) {

        this.patternLength = patternLength; 

    }

    public void Print() {

        Random rnd = new Random();

        int specialIndex = rnd.Next(patternLength);

        for (int i=0;i<patternLength;i++) {

            if (i == specialIndex)

                PrintSpecial();

            else {

                int roll = rnd.Next(2); // either 0 or 1

                if (roll == 0) PrintNormal();

                else PrintVariant();

            }

        }

    }

    public abstract void PrintNormal();

    public abstract void PrintVariant();

    public abstract void PrintSpecial();

}

​

​

public class RiverPattern : PatternPrinter{

        private int patternLength;

        public RiverPattern(int patternLength):base(patternLength) {

        this.patternLength = patternLength; 

    }

        public void Print() {

        Random rnd = new Random();

        int specialIndex = rnd.Next(patternLength);

        for (int i=0;i<patternLength;i++) {

            if (i == specialIndex)

                PrintSpecial();

            else {

                int roll = rnd.Next(2); // either 0 or 1

                if (roll == 0) PrintNormal();

                else PrintVariant();

            }

        }

    }

    public override void PrintNormal(){

        /*

       for(int i=0;i<11;i++){

           if ((i==4) || (i==5) || (i==6)){

               Console.Write(" ");

           }else if ((i==3) || (i== 7)){

           Console.Write("0");}

           else{

           Console.Write("*");}

       }

       Console.WriteLine("");

       */

    }

    public override void PrintVariant(){

​

        Random rnd2 = new Random();

        int y = rnd2.Next(1,4);

        for(int o = 0;o<20;o++){

            Console.WriteLine(y);

        }

        /*

        for(int i = 0;i<y;i++){

            Console.Write("*");

        }Console.Write("0");

        Console.Write(" ");Console.Write(" ");Console.Write(" ");

        Console.Write("0");

        for(int x = y+5;x<11;x++){

            Console.Write("*");

        }

        Console.WriteLine(" ");

        */

    }

    public override void PrintSpecial(){

    }

}

​

​

public class Program

{

    public static void Main()

    {

        RiverPattern river = new RiverPattern(10);

        river.Print();

    }

}

​