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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| import java.util.ArrayDeque; | ||
| import java.util.ArrayList; | ||
| import java.util.Arrays; | ||
| import java.util.Deque; | ||
| import java.util.List; | ||
| import java.util.function.Function; | ||
| import java.util.stream.IntStream; | ||
| import java.util.stream.Stream; | ||
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|
||
| import com.github.pareronia.aoc.LongRange; | ||
| import com.github.pareronia.aoc.LongRange.JoinResult; | ||
| import com.github.pareronia.aoc.StringOps; | ||
| 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_05 | ||
| extends SolutionBase<AoC2023_05.Almanac, Long, Long> { | ||
|
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| private AoC2023_05(final boolean debug) { | ||
| super(debug); | ||
| } | ||
|
|
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| public static AoC2023_05 create() { | ||
| return new AoC2023_05(false); | ||
| } | ||
|
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| public static AoC2023_05 createDebug() { | ||
| return new AoC2023_05(true); | ||
| } | ||
|
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| @Override | ||
| protected Almanac parseInput(final List<String> inputs) { | ||
| return Almanac.fromInput(inputs); | ||
| } | ||
|
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| private long solve(final Almanac almanac, final List<LongRange> seedRanges) { | ||
| return almanac.getLocation(seedRanges).stream() | ||
| .sorted() | ||
| .findFirst().orElseThrow() | ||
| .iterator().next(); | ||
| } | ||
|
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||
| @Override | ||
| public Long solvePart1(final Almanac almanac) { | ||
| log(almanac); | ||
| final List<LongRange> seedRanges | ||
| = almanac.seeds().stream() | ||
| .map(s -> LongRange.between(s.longValue(), s.longValue() + 1L)) | ||
| .toList(); | ||
| return solve(almanac, seedRanges); | ||
| } | ||
|
|
||
| @Override | ||
| public Long solvePart2(final Almanac almanac) { | ||
| final List<Long> seeds = almanac.seeds(); | ||
| final List<LongRange> seedRanges | ||
| = Stream.iterate(0, i -> i < seeds.size(), i -> i + 2) | ||
| .map(i -> LongRange.between( | ||
| seeds.get(i).longValue(), | ||
| seeds.get(i).longValue() + seeds.get(i + 1).longValue())) | ||
| .toList(); | ||
| return solve(almanac, seedRanges); | ||
| } | ||
|
|
||
| @Override | ||
| @Samples({ | ||
| @Sample(method = "part1", input = TEST, expected = "35"), | ||
| @Sample(method = "part2", input = TEST, expected = "46"), | ||
| }) | ||
| public void samples() { | ||
| } | ||
|
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| public static void main(final String[] args) throws Exception { | ||
| AoC2023_05.create().run(); | ||
| } | ||
|
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| record MappingParams(LongRange range, long diff) {} | ||
|
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| record Mapping(List<MappingParams> ranges) { | ||
|
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| public List<LongRange> map(final List<LongRange> inps) { | ||
| final List<LongRange> ans = new ArrayList<>(); | ||
| final Deque<LongRange> q = new ArrayDeque<>(inps); | ||
| while(!q.isEmpty()) { | ||
| final LongRange inp = q.pop(); | ||
| boolean found = false; | ||
| for (final MappingParams r : ranges) { | ||
| final JoinResult result = inp.leftJoin(r.range()); | ||
| if (result.intersection().isPresent()) { | ||
| final LongRange intersection = result.intersection().get(); | ||
| ans.add(intersection.translate(r.diff())); | ||
| result.others().forEach(o -> q.add(o)); | ||
| found = true; | ||
| break; | ||
| } | ||
| } | ||
| if (!found) { | ||
| ans.add(inp); | ||
| } | ||
| } | ||
| return ans; | ||
| } | ||
| } | ||
|
|
||
| record Almanac(List<Long> seeds, List<Mapping> mappings) { | ||
|
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||
| public static Almanac fromInput(final List<String> input) { | ||
| final List<List<String>> blocks = StringOps.toBlocks(input); | ||
| final List<Long> seeds = Arrays.stream( | ||
| blocks.get(0).get(0).split(": ")[1].split(" ")) | ||
| .map(Long::valueOf) | ||
| .toList(); | ||
| final Function<String, MappingParams> getMappingParams = s -> { | ||
| final long[] x = Arrays.stream(s.split(" ")).mapToLong(Long::valueOf).toArray(); | ||
| return new MappingParams(LongRange.between(x[1], x[1] + x[2]), x[0] - x[1]); | ||
| }; | ||
| final List<Mapping> mappings = IntStream.range(1, blocks.size()) | ||
| .mapToObj(i -> { | ||
| final List<MappingParams> ranges = | ||
| blocks.get(i).subList(1, blocks.get(i).size()).stream() | ||
| .map(line -> getMappingParams.apply(line)) | ||
| .toList(); | ||
| return new Mapping(ranges); | ||
| }) | ||
| .toList(); | ||
| return new Almanac(seeds, mappings); | ||
| } | ||
|
|
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| public List<LongRange> getLocation(final List<LongRange> seedRanges) { | ||
| List<LongRange> ans = new ArrayList<>(seedRanges); | ||
| for (final Mapping mapping : this.mappings) { | ||
| ans = mapping.map(ans); | ||
| } | ||
| return ans; | ||
| } | ||
| } | ||
|
|
||
| private static final String TEST = """ | ||
| seeds: 79 14 55 13 | ||
| seed-to-soil map: | ||
| 50 98 2 | ||
| 52 50 48 | ||
| soil-to-fertilizer map: | ||
| 0 15 37 | ||
| 37 52 2 | ||
| 39 0 15 | ||
| fertilizer-to-water map: | ||
| 49 53 8 | ||
| 0 11 42 | ||
| 42 0 7 | ||
| 57 7 4 | ||
| water-to-light map: | ||
| 88 18 7 | ||
| 18 25 70 | ||
| light-to-temperature map: | ||
| 45 77 23 | ||
| 81 45 19 | ||
| 68 64 13 | ||
| temperature-to-humidity map: | ||
| 0 69 1 | ||
| 1 0 69 | ||
| humidity-to-location map: | ||
| 60 56 37 | ||
| 56 93 4 | ||
| """; | ||
| } |