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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| import static com.github.pareronia.aoc.IterTools.enumerateFrom; | ||
| import static com.github.pareronia.aoc.Utils.toAString; | ||
| import static java.util.Comparator.comparing; | ||
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| import java.util.Comparator; | ||
| import java.util.List; | ||
| import java.util.function.Function; | ||
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| import com.github.pareronia.aoc.Counter; | ||
| import com.github.pareronia.aoc.StringOps; | ||
| import com.github.pareronia.aoc.StringOps.StringSplit; | ||
| import com.github.pareronia.aoc.Utils; | ||
| import com.github.pareronia.aoc.solution.Sample; | ||
| import com.github.pareronia.aoc.solution.Samples; | ||
| import com.github.pareronia.aoc.solution.SolutionBase; | ||
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| public final class AoC2023_07 | ||
| extends SolutionBase<List<AoC2023_07.Hand>, Integer, Integer> { | ||
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| private AoC2023_07(final boolean debug) { | ||
| super(debug); | ||
| } | ||
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| public static AoC2023_07 create() { | ||
| return new AoC2023_07(false); | ||
| } | ||
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| public static AoC2023_07 createDebug() { | ||
| return new AoC2023_07(true); | ||
| } | ||
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| @Override | ||
| protected List<Hand> parseInput(final List<String> inputs) { | ||
| return inputs.stream().map(Hand::fromInput).toList(); | ||
| } | ||
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| private int solve(final List<Hand> hands, final Comparator<Hand> order) { | ||
| return enumerateFrom(1, hands.stream().sorted(order)) | ||
| .mapToInt(e -> e.index() * e.value().bid()) | ||
| .sum(); | ||
| } | ||
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||
| @Override | ||
| public Integer solvePart1(final List<Hand> hands) { | ||
| return solve(hands, Hand.comparator()); | ||
| } | ||
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| @Override | ||
| public Integer solvePart2(final List<Hand> hands) { | ||
| return solve(hands, Hand.comparatorWithJokers()); | ||
| } | ||
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| @Override | ||
| @Samples({ | ||
| @Sample(method = "part1", input = TEST, expected = "6440"), | ||
| @Sample(method = "part2", input = TEST, expected = "5905"), | ||
| }) | ||
| public void samples() { | ||
| } | ||
|
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| public static void main(final String[] args) throws Exception { | ||
| AoC2023_07.create().run(); | ||
| } | ||
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| record Hand( | ||
| int bid, | ||
| int value, | ||
| String strength, | ||
| int valueWithJokers, | ||
| String strengthWithJokers | ||
| ) { | ||
| private static final Character JOKER = 'J'; | ||
| private static final String BEST = "AAAAA"; | ||
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| public static Hand fromInput(final String line) { | ||
| final Function<String, Integer> getValue = cards -> { | ||
| final List<Counter.Entry<Character>> mc | ||
| = new Counter<>(Utils.asCharacterStream(cards).toList()).mostCommon(); | ||
| return (int) (2 * mc.get(0).count() + (mc.size() > 1 ? mc.get(1).count() : 0)); | ||
| }; | ||
| final Function<String, String> withJokers = cards -> { | ||
| final Counter<Character> c = new Counter<>( | ||
| Utils.asCharacterStream(cards).filter(ch -> ch != JOKER).toList()); | ||
| if (c.isEmpty()) { | ||
| return BEST; | ||
| } | ||
| final Character best = c.mostCommon().get(0).value(); | ||
| return Utils.asCharacterStream(cards) | ||
| .map(ch -> ch == JOKER ? best : ch) | ||
| .collect(toAString()); | ||
| }; | ||
|
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| final StringSplit split = StringOps.splitOnce(line, " "); | ||
| final int bid = Integer.parseInt(split.right()); | ||
| final int value = getValue.apply(split.left()); | ||
| final String strength = StringOps.translate(split.left(), "TJQKA", "BCDEF"); | ||
| final int valueWithJokers = getValue.apply(withJokers.apply(split.left())); | ||
| final String strengthWithJokers = StringOps.translate(split.left(), "TJQKA", "B0DEF"); | ||
| return new Hand(bid, value, strength, valueWithJokers, strengthWithJokers); | ||
| } | ||
|
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| public static Comparator<Hand> comparator() { | ||
| return comparing(Hand::value).thenComparing(comparing(Hand::strength)); | ||
| } | ||
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| public static Comparator<Hand> comparatorWithJokers() { | ||
| return comparing(Hand::valueWithJokers) | ||
| .thenComparing(comparing(Hand::strengthWithJokers)); | ||
| } | ||
| } | ||
|
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| private static final String TEST = """ | ||
| 32T3K 765 | ||
| T55J5 684 | ||
| KK677 28 | ||
| KTJJT 220 | ||
| QQQJA 483 | ||
| """; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| package com.github.pareronia.aoc; | ||
|
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| import static java.util.stream.Collectors.counting; | ||
| import static java.util.stream.Collectors.groupingBy; | ||
|
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| import java.util.List; | ||
| import java.util.Map; | ||
|
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| public class Counter<T> { | ||
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| private final Map<T, Long> counts; | ||
|
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| public Counter(final Iterable<T> iterable) { | ||
| this.counts = Utils.stream(iterable.iterator()) | ||
| .collect(groupingBy(o -> o, counting())); | ||
| } | ||
|
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| public boolean isEmpty() { | ||
| return this.counts.isEmpty(); | ||
| } | ||
|
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| public List<Entry<T>> mostCommon() { | ||
| return this.counts.entrySet().stream() | ||
| .sorted((e1, e2) -> Long.compare(e2.getValue(), e1.getValue())) | ||
| .map(e -> new Entry<T>(e.getKey(), e.getValue())) | ||
| .toList(); | ||
| } | ||
|
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| public record Entry<T>(T value, long count) {} | ||
| } |
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