public int countWays(int n) {
    if (n == 0) return 1;
    if (n < 0) return 0;

    return countWays(n - 1) + countWays(n - 2);
}

public int countWaysVariableSteps(int n, int[] steps) {
    if (n == 0) return 1;
    if (n < 0) return 0;

    int totalWays = 0;
    for (int step : steps) {
        totalWays += countWaysVariableSteps(n - step, steps);
    }
    return totalWays;
}

int[] steps = {1, 2};
System.out.println(countWaysVariableSteps(4, steps));

int [] numbers = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20};

int shift = 2;
int space = 4;

/* function */
private int [] shiftRight(int [] values, int shift, int space) {
    /* code here */
}

for ( int value : shiftRight(numbers, shift, space)) {
    System.out.println(value);
}

// Press Shift twice to open the Search Everywhere dialog and type `show whitespaces`,
// then press Enter. You can now see whitespace characters in your code.
import java.awt.GridLayout;
import java.io.File;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import java.util.*;

class City {
    char firstLetter;
    String state;
    String county;
    String name;
    int population;
    String filename;
    public City (String filename){
        String[] information = filename.split("_");
        this.firstLetter = information[0].charAt(0);
        this.state = information[2];
        this.county = information[1];
        this.name = information[0];
        String pop = information[3];
        this.population = Integer.parseInt(pop.substring(0, pop.length() - 4));
        this.filename = filename;
    }

    public char getFirstLetter() {
        return firstLetter;
    }
    public String getState() {
        return state;
    }
    public String getCounty() {
        return county;
    }
    public String getName() {
        return name;
    }
    public int getPopulation() {
        return population;
    }
    public String getFilename() {
        return filename;
    }
    public void displayImage(String filename) {
        Main.showImage("./Cities/" + filename);
    }
}

public class Main {
    public static void main(String[] args) {
        int end = 0;
        int finaled = 0;
        float score = 0;
        float score_to_add;
        Scanner scanner = new Scanner(System.in);
        Random rand = new Random();

        File folder = new File("./Cities");
        File[] listOfFiles = folder.listFiles();
        City city;
        City[] cities = new City[listOfFiles.length];

        for(int i = 0;i<listOfFiles.length;i++) {
            city = new City(listOfFiles[i].getName());
            cities[i] = city;
        }

        List<Integer> done_cities = new ArrayList<Integer>();
        boolean done_yet;
        boolean is_same;
        int cities_done = 0;
        while (end == 0) {
            score_to_add = 1;
            finaled = 0;
            System.out.println("----------------------------------------");
            System.out.println("Here is your city!");
            done_yet = true;
            int city_to_add = 0;
            int randInt;
            while (done_yet == true) {
                is_same = false;
                randInt = rand.nextInt(cities.length);
                for(int i=0;i<done_cities.size();i++) {
                    if (randInt == done_cities.get(i)) {
                        is_same = true;
                    }
                }
                if (is_same == false) {
                    done_yet = false;
                }
                if (done_yet == false) {
                    city_to_add = randInt;
                }
            }
            City current_city = cities[city_to_add];
            cities_done += 1;
            done_cities.add(city_to_add);
            current_city.displayImage(current_city.getFilename());
            System.out.println("Cities done: " + cities_done);
            System.out.print("Enter Answer: ");
            String response = scanner.nextLine();
            while (finaled == 0) {
                if (response.equals("s")) {
                    if (score_to_add > 0) {
                        System.out.println("State: " + current_city.getState());
                        score_to_add -= 0.5;
                        System.out.print("Enter Answer: ");
                        response = scanner.nextLine();
                    } else {
                        System.out.println("Two hints have already been used, sorry!");
                        System.out.print("Enter Answer: ");
                        response = scanner.nextLine();
                    }
                } else if (response.equals("c")) {
                    if (score_to_add > 0) {
                        System.out.println("County: " + current_city.getCounty());
                        score_to_add -= 0.5;
                        System.out.print("Enter Answer: ");
                        response = scanner.nextLine();
                    } else {
                        System.out.println("Two hints have already been used, sorry!");
                    }
                } else if (response.equals("f")) {
                    if (score_to_add > 0) {
                        System.out.println("First Letter: " + current_city.getFirstLetter());
                        score_to_add -= 0.5;
                        System.out.print("Enter Answer: ");
                        response = scanner.nextLine();
                    } else {
                        System.out.println("Two hints have already been used, sorry!");
                    }
                } else if (response.equals("e")) {
                    System.out.println("Your final score was: " + score);
                    finaled = 1;
                    end = 1;
                } else {
                    finaled = 1;
                    if (response.equals(current_city.getName())) {
                        score += score_to_add;
                        System.out.println("Good job! The city was " + current_city.getName() + ", " + current_city.getCounty() + ", " + current_city.getState() + " (" + current_city.getPopulation() + ")");
                        System.out.println("Score: " + score);
                    } else {
                        score = 0;
                        System.out.println("I'm sorry, The city was " + current_city.getName() + ", " + current_city.getCounty() + ", " + current_city.getState() + " (" + current_city.getPopulation() + ")");
                        System.out.println("Score: " + score);
                    }
                }
            }
        }

    }
    static void showImage(final String fileName)
    {
        System.out.println(fileName);
    }
}

Main.main(null)