java-uber-alles

package advent.of.code;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;

public class Day3 {

    private String content;
    private char[] array;
    private Santa regularSanta;
    private Santa roboSanta;
    private int startPosX = 500;
    private int startPosY = 500;
    private int grid[][];

    public static void main(String[] args) {
        Day3 day3 = new Day3();
        day3.loadContent();
        day3.initSantas();
        day3.part1();
        day3.initSantas();
        day3.part2();
    }

    private void initSantas() {
        this.grid = new int[1000][1000];
        regularSanta = new Santa(startPosX, startPosY);
        roboSanta = new Santa(startPosX, startPosY);
    }

    private void loadContent() {
        try {
            content = new String(Files.readAllBytes(Paths.get("C:\\AdventOfCode\\input3.txt")));
            array = content.toCharArray();
            System.out.println("array size = " + array.length);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void part1() {
        for(char c : array) {
            regularSanta.move(c);
        }
        System.out.println("part1 total = " + checkHowManyYouVisitedYouFatOaf());
    }

    private void part2() {
        int counter = 0;
        for(char c : array) {
            if(counter % 2 == 0) {
                regularSanta.move(c);
            } else {
                roboSanta.move(c);
            }
            counter++;
        }

        System.out.println("part2 total = " + checkHowManyYouVisitedYouFatOaf());
    }

    private class Santa {
        public int x;
        public int y;

        public Santa(int x, int y) {
            this.x = x;
            this.y = y;
            visitHouse();
        }

        public void move(char direction) {
            if(direction == '^') {
                y += 1;
            } else if(direction == 'v') {
                y -= 1;
            } else if(direction == '<') {
                x -= 1;
            } else if(direction == '>') {
                x += 1;
            }
            visitHouse();
        }

        public void visitHouse() {
            grid[x][y] += 1;
        }
    }

    public int checkHowManyYouVisitedYouFatOaf() {
        int total = 0;

        for(int i=0; i<grid.length; i++) {
            for(int j=0; j<grid[i].length; j++) {
                if(grid[i][j] > 0) {
                    total++;
                }
            }
        }

        return total;
    }

}