//GuessTheNumbers.java

import java.util.HashSet;
import java.util.Scanner;

public class GuessTheNumbers
{
    public static void main(String[] args)
    {
        Scanner scnr = new Scanner(System.in);
        HashSet<Integer> numbersToGuess = new HashSet<Integer>();
        int userGuess;

        numbersToGuess.add(3);
        numbersToGuess.add(5);
        numbersToGuess.add(1);

        System.out.print("Enter a number between 1 to 10 (0 to exit): ");
        userGuess = scnr.nextInt();

        while (userGuess != 0)
        {
            // Check user's guess
            //if (numbersToGuess.contains(userGuess))
            //{
                //numbersToGuess.remove(userGuess);
            //Above 3 lines revised as the following line
            if (numbersToGuess.remove(userGuess))
            {
                System.out.println
                (
                    "Good guess! "
                    + numbersToGuess.size()
                    + " number(s) remaining."
                );
            }
            else
            {
                System.out.println
                (
                    "Incorrect guess. "
                    + numbersToGuess.size()
                    + " number(s) remaining."
                );
            }

            System.out.println();

            // Exit if no numbers are left, otherwise ask again
            if (numbersToGuess.size() == 0)
            {
                break;
            }
            else
            {
                System.out.print
                (
                    "Enter a number between 1 to 10 (0 to exit): "
                );
                userGuess = scnr.nextInt();
            }
        }

        // Print victory/failure message
        if (userGuess != 0)
        {
            System.out.println("You won!");
        }
        else
        {
            System.out.println("Quitters always lose!");
        }
    }
}