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Advent of Code 2017 - Day 3
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package Advent2017; | |
import util.Direction; | |
import util.Node; | |
import util.Timer; | |
import java.util.*; | |
public class Day3 { | |
private static Map<Node, Integer> points = new HashMap<>(); | |
private static int sumOfNeighbors(int x, int y) { | |
int sum = 0; | |
for (int i = -1; i < 2; i++) { | |
for (int j = -1; j < 2; j++) { | |
if (i != 0 || j != 0) { | |
Node n = new Node(x + j, y + i); | |
sum += points.getOrDefault(n, 0); | |
} | |
} | |
} | |
return sum; | |
} | |
private static Node move(Node pos, Direction dir) { | |
return new Node(pos.getX() + dir.getDx(), pos.getY() + dir.getDy()); | |
} | |
public static void main(String[] args) { | |
Timer.startTimer(); | |
int goal = 277678; | |
Node position = new Node(0, 0); | |
Direction current = Direction.EAST; | |
points.put(position, 1); | |
int num = 1; | |
int moves = 1; | |
boolean toggle = false; | |
int moveCount = 0; | |
boolean firstHighest = false; | |
while (num < goal) { | |
position = move(position, current); | |
int part2 = sumOfNeighbors(position.getX(), position.getY()); | |
if (part2 > goal) { | |
if (!firstHighest) { | |
System.out.println("Part 2: " + part2); | |
} | |
firstHighest = true; | |
} | |
points.put(position, part2); | |
moveCount++; | |
if (moveCount >= moves) { | |
moveCount = 0; | |
current = current.getLeft(); | |
toggle = !toggle; | |
if (!toggle) { | |
moves++; | |
} | |
} | |
num++; | |
} | |
System.out.println("Part 1: " + Math.abs(position.getX() + position.getY())); | |
System.out.println(Timer.endTimer()); | |
} | |
} |
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