AdventOfCode2017/Day16

Day16Part1.java

	private static String[] dancers = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p"};

	public static void main(String args[]) throws IOException {


		List<String> bloccs = Files.readAllLines(Paths.get(new File("res/day16").getPath())).stream()
				.collect(Collectors.toList());
		
		for(String s : bloccs.get(0).split(",")) {
			
			char mode = s.charAt(0);
			System.out.println(mode);
			switch(mode) {
			case 's':
				spin(Integer.parseInt(s.replaceAll("s", "")));
				break;
			case 'x':
				String[] data = s.replaceAll("x", "").split("/");
				exchange(Integer.parseInt(data[0]), Integer.parseInt(data[1]));
				break;
			case 'p':
				String[] data1 = s.replaceFirst("p", "").split("/");
				partner(data1[0], data1[1]);
				break;
			}
			
		}
		
		System.out.println(String.join("", dancers));
		
	
	}
	
	
	private static void spin(int x) {
		
		List<String> dancersL = new ArrayList<String>(Arrays.asList(dancers));
		Collections.rotate(dancersL, x);
		dancers = dancersL.toArray(dancers);
	
	}
	
	private static void exchange(int x, int y) {
	
		String beforeY = dancers[y];
		
		dancers[y] = dancers[x];
		dancers[x] = beforeY;
		
		
	}
	
	private static void partner(String a, String b) {

		int indexA = Arrays.asList(dancers).indexOf(a);
		int indexB = Arrays.asList(dancers).indexOf(b);
		
		exchange(indexA, indexB);
	}

Day16Part2.java

private static String[] dancers = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o",
			"p" };
	
	private static List<String> seen = new ArrayList<String>();

	public static void main(String args[]) throws IOException {

		List<String> bloccs = Files.readAllLines(Paths.get(new File("res/day16").getPath())).stream()
				.collect(Collectors.toList());

		String[] toIterate = bloccs.get(0).split(",");
		
		for (int i = 0; i < 1000000000; i++) {
			System.out.println("Running " + i);
			System.out.println(seen.size());
			if(seen.contains(String.join("", dancers))) {
				System.out.println("Found match");
				System.out.println(seen.get(1000000000 % i));
				break;
				
			}
			seen.add(String.join("", dancers));
			for (String s : toIterate) {
				
				
				char mode = s.charAt(0);
				
				switch (mode) {
				case 's':
					spin(Integer.parseInt(s.replaceAll("s", "")));
					break;
				case 'x':
					String[] data = s.replaceAll("x", "").split("/");
					exchange(Integer.parseInt(data[0]), Integer.parseInt(data[1]));
					break;
				case 'p':
					String[] data1 = s.replaceFirst("p", "").split("/");
					partner(data1[0], data1[1]);
					break;
				}

				
				
			}
		}
		

	}

	private static void spin(int x) {

		List<String> dancersL = new ArrayList<String>(Arrays.asList(dancers));
		Collections.rotate(dancersL, x);
		dancers = dancersL.toArray(dancers);

	}

	private static void exchange(int x, int y) {

		String beforeY = dancers[y];

		dancers[y] = dancers[x];
		dancers[x] = beforeY;

	}

	private static void partner(String a, String b) {

		int indexA = Arrays.asList(dancers).indexOf(a);
		int indexB = Arrays.asList(dancers).indexOf(b);

		exchange(indexA, indexB);
	}