using System;

using System.Collections.Generic;

​

public class Program

{

    private static HashSet<int> randomValues = new HashSet<int>();

    public static void Main()

    {

        for(int i = 0; i < 2000; i++)

        {

            wildPokemonEncounter();

        }

        Console.WriteLine("1st iteration results");

        foreach(int rnd in randomValues) {

            Console.WriteLine(rnd);

        }

        randomValues.Clear();

        for(int i = 0; i < 20000; i++)

        {

            wildPokemonEncounter();

        }

        Console.WriteLine("2nd iteration results");

        foreach(int rnd in randomValues) {

            Console.WriteLine(rnd);

        }

    }

    //static Random rnd = new Random();

    public static void wildPokemonEncounter()

    {

        int possiblePokemon = 4;

        Random rnd = new Random();

        int whichPokemon = rnd.Next(1, possiblePokemon);

        if(!randomValues.Contains(whichPokemon)) {

            randomValues.Add(whichPokemon);

        }

    }

}