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1 | 1 | package com.sbaars.adventofcode.year15.days; |
2 | 2 |
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3 | 3 | import com.sbaars.adventofcode.year15.Day2015; |
| 4 | +import java.util.*; |
| 5 | +import java.util.regex.Matcher; |
| 6 | +import java.util.regex.Pattern; |
| 7 | +import java.util.stream.Collectors; |
4 | 8 |
|
5 | 9 | public class Day14 extends Day2015 { |
6 | | - public Day14() { |
7 | | - super(14); |
8 | | - } |
9 | | - |
10 | | - public static void main(String[] args) { |
11 | | - new Day14().printParts(); |
12 | | - } |
13 | | - |
14 | | - @Override |
15 | | - public Object part1() { |
16 | | - return ""; |
17 | | - } |
18 | | - |
19 | | - @Override |
20 | | - public Object part2() { |
21 | | - return ""; |
22 | | - } |
| 10 | + |
| 11 | + private static final int RACE_DURATION = 2503; |
| 12 | + private final List<Reindeer> reindeers = new ArrayList<>(); |
| 13 | + |
| 14 | + public Day14() { |
| 15 | + super(14); |
| 16 | + parseInput(); |
| 17 | + } |
| 18 | + |
| 19 | + public static void main(String[] args) { |
| 20 | + Day14 day = new Day14(); |
| 21 | + day.printParts(); |
| 22 | + new com.sbaars.adventofcode.network.Submit().submit(day.part1(), 2015, 14, 1); |
| 23 | + } |
| 24 | + |
| 25 | + private void parseInput() { |
| 26 | + Pattern pattern = Pattern.compile("(\\w+) can fly (\\d+) km/s for (\\d+) seconds, but then must rest for (\\d+) seconds\\."); |
| 27 | + Arrays.stream(day().split("\n")) |
| 28 | + .map(pattern::matcher) |
| 29 | + .filter(Matcher::find) |
| 30 | + .map(matcher -> new Reindeer( |
| 31 | + matcher.group(1), |
| 32 | + Integer.parseInt(matcher.group(2)), |
| 33 | + Integer.parseInt(matcher.group(3)), |
| 34 | + Integer.parseInt(matcher.group(4)) |
| 35 | + )) |
| 36 | + .forEach(reindeers::add); |
| 37 | + } |
| 38 | + |
| 39 | + @Override |
| 40 | + public Object part1() { |
| 41 | + return reindeers.stream() |
| 42 | + .mapToInt(reindeer -> reindeer.getDistanceAfter(RACE_DURATION)) |
| 43 | + .max() |
| 44 | + .orElse(0); |
| 45 | + } |
| 46 | + |
| 47 | + @Override |
| 48 | + public Object part2() { |
| 49 | + return 0; // Implement in next part |
| 50 | + } |
| 51 | + |
| 52 | + private static class Reindeer { |
| 53 | + private final String name; |
| 54 | + private final int speed; |
| 55 | + private final int flyTime; |
| 56 | + private final int restTime; |
| 57 | + |
| 58 | + public Reindeer(String name, int speed, int flyTime, int restTime) { |
| 59 | + this.name = name; |
| 60 | + this.speed = speed; |
| 61 | + this.flyTime = flyTime; |
| 62 | + this.restTime = restTime; |
| 63 | + } |
| 64 | + |
| 65 | + public int getDistanceAfter(int seconds) { |
| 66 | + int cycleTime = flyTime + restTime; |
| 67 | + int completeCycles = seconds / cycleTime; |
| 68 | + int remainingSeconds = Math.min(flyTime, seconds % cycleTime); |
| 69 | + |
| 70 | + return speed * (completeCycles * flyTime + remainingSeconds); |
| 71 | + } |
| 72 | + } |
23 | 73 | } |
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