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1 | 1 | package com.sbaars.adventofcode.year15.days; |
2 | 2 |
|
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 Day15 extends Day2015 { |
6 | | - public Day15() { |
7 | | - super(15); |
8 | | - } |
9 | | - |
10 | | - public static void main(String[] args) { |
11 | | - new Day15().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 TOTAL_TEASPOONS = 100; |
| 12 | + private final List<Ingredient> ingredients = new ArrayList<>(); |
| 13 | + |
| 14 | + public Day15() { |
| 15 | + super(15); |
| 16 | + parseInput(); |
| 17 | + } |
| 18 | + |
| 19 | + public static void main(String[] args) { |
| 20 | + Day15 day = new Day15(); |
| 21 | + day.printParts(); |
| 22 | + new com.sbaars.adventofcode.network.Submit().submit(day.part1(), 2015, 15, 1); |
| 23 | + } |
| 24 | + |
| 25 | + private void parseInput() { |
| 26 | + Pattern pattern = Pattern.compile("(\\w+): capacity (-?\\d+), durability (-?\\d+), flavor (-?\\d+), texture (-?\\d+), calories (-?\\d+)"); |
| 27 | + Arrays.stream(day().split("\n")) |
| 28 | + .map(pattern::matcher) |
| 29 | + .filter(Matcher::find) |
| 30 | + .map(matcher -> new Ingredient( |
| 31 | + matcher.group(1), |
| 32 | + Integer.parseInt(matcher.group(2)), |
| 33 | + Integer.parseInt(matcher.group(3)), |
| 34 | + Integer.parseInt(matcher.group(4)), |
| 35 | + Integer.parseInt(matcher.group(5)), |
| 36 | + Integer.parseInt(matcher.group(6)) |
| 37 | + )) |
| 38 | + .forEach(ingredients::add); |
| 39 | + } |
| 40 | + |
| 41 | + @Override |
| 42 | + public Object part1() { |
| 43 | + return findBestScore(); |
| 44 | + } |
| 45 | + |
| 46 | + @Override |
| 47 | + public Object part2() { |
| 48 | + return 0; // Implement in next part |
| 49 | + } |
| 50 | + |
| 51 | + private long findBestScore() { |
| 52 | + return generateCombinations(TOTAL_TEASPOONS, ingredients.size()) |
| 53 | + .stream() |
| 54 | + .mapToLong(this::calculateScore) |
| 55 | + .max() |
| 56 | + .orElse(0); |
| 57 | + } |
| 58 | + |
| 59 | + private List<List<Integer>> generateCombinations(int total, int parts) { |
| 60 | + List<List<Integer>> result = new ArrayList<>(); |
| 61 | + generateCombinationsHelper(total, parts, new ArrayList<>(), result); |
| 62 | + return result; |
| 63 | + } |
| 64 | + |
| 65 | + private void generateCombinationsHelper(int remaining, int parts, List<Integer> current, List<List<Integer>> result) { |
| 66 | + if (parts == 1) { |
| 67 | + List<Integer> combination = new ArrayList<>(current); |
| 68 | + combination.add(remaining); |
| 69 | + result.add(combination); |
| 70 | + return; |
| 71 | + } |
| 72 | + |
| 73 | + for (int i = 0; i <= remaining; i++) { |
| 74 | + List<Integer> newCurrent = new ArrayList<>(current); |
| 75 | + newCurrent.add(i); |
| 76 | + generateCombinationsHelper(remaining - i, parts - 1, newCurrent, result); |
| 77 | + } |
| 78 | + } |
| 79 | + |
| 80 | + private long calculateScore(List<Integer> amounts) { |
| 81 | + int capacity = 0; |
| 82 | + int durability = 0; |
| 83 | + int flavor = 0; |
| 84 | + int texture = 0; |
| 85 | + |
| 86 | + for (int i = 0; i < ingredients.size(); i++) { |
| 87 | + Ingredient ingredient = ingredients.get(i); |
| 88 | + int amount = amounts.get(i); |
| 89 | + |
| 90 | + capacity += ingredient.capacity * amount; |
| 91 | + durability += ingredient.durability * amount; |
| 92 | + flavor += ingredient.flavor * amount; |
| 93 | + texture += ingredient.texture * amount; |
| 94 | + } |
| 95 | + |
| 96 | + if (capacity <= 0 || durability <= 0 || flavor <= 0 || texture <= 0) { |
| 97 | + return 0; |
| 98 | + } |
| 99 | + |
| 100 | + return (long) capacity * durability * flavor * texture; |
| 101 | + } |
| 102 | + |
| 103 | + private static class Ingredient { |
| 104 | + private final String name; |
| 105 | + private final int capacity; |
| 106 | + private final int durability; |
| 107 | + private final int flavor; |
| 108 | + private final int texture; |
| 109 | + private final int calories; |
| 110 | + |
| 111 | + public Ingredient(String name, int capacity, int durability, int flavor, int texture, int calories) { |
| 112 | + this.name = name; |
| 113 | + this.capacity = capacity; |
| 114 | + this.durability = durability; |
| 115 | + this.flavor = flavor; |
| 116 | + this.texture = texture; |
| 117 | + this.calories = calories; |
| 118 | + } |
| 119 | + } |
23 | 120 | } |
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