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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| import static com.github.pareronia.aoc.IntegerSequence.Range.range; | ||
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|
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| import java.util.Arrays; | ||
| import java.util.HashMap; | ||
| import java.util.HashSet; | ||
| import java.util.Iterator; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
| import java.util.function.ToIntBiFunction; | ||
|
|
||
| import com.github.pareronia.aoc.Grid.Cell; | ||
| import com.github.pareronia.aoc.Utils; | ||
| import com.github.pareronia.aoc.geometry.Direction; | ||
| import com.github.pareronia.aoc.graph.BFS; | ||
| 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 AoC2024_12 extends SolutionBase<List<String>, Integer, Integer> { | ||
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| private static final List<List<Direction>> CORNER_DIRS = List.of( | ||
| List.of(Direction.LEFT_AND_UP, Direction.LEFT, Direction.UP), | ||
| List.of(Direction.RIGHT_AND_UP, Direction.RIGHT, Direction.UP), | ||
| List.of(Direction.RIGHT_AND_DOWN, Direction.RIGHT, Direction.DOWN), | ||
| List.of(Direction.LEFT_AND_DOWN, Direction.LEFT, Direction.DOWN) | ||
| ); | ||
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|
||
| private AoC2024_12(final boolean debug) { | ||
| super(debug); | ||
| } | ||
|
|
||
| public static AoC2024_12 create() { | ||
| return new AoC2024_12(false); | ||
| } | ||
|
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| public static AoC2024_12 createDebug() { | ||
| return new AoC2024_12(true); | ||
| } | ||
|
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||
| @Override | ||
| protected List<String> parseInput(final List<String> inputs) { | ||
| return inputs; | ||
| } | ||
|
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| private int solve( | ||
| final List<String> input, | ||
| final ToIntBiFunction<Cell, Set<Cell>> count | ||
| ) { | ||
| final Map<Character, Set<Cell>> plotsByPlant = new HashMap<>(); | ||
| range(input.size()).forEach(r -> | ||
| range(input.get(r).length()).forEach(c -> | ||
| plotsByPlant | ||
| .computeIfAbsent(input.get(r).charAt(c), k -> new HashSet<>()) | ||
| .add(Cell.at(r, c)))); | ||
| final Iterator<Set<Cell>> regions = new Iterator<>() { | ||
| final Iterator<Character> keys = plotsByPlant.keySet().iterator(); | ||
| char key = keys.next(); | ||
| Set<Cell> allPlotsWithPlant = plotsByPlant.get(key); | ||
|
|
||
| @Override | ||
| public Set<Cell> next() { | ||
| if (allPlotsWithPlant.isEmpty()) { | ||
| key = keys.next(); | ||
| allPlotsWithPlant = plotsByPlant.get(key); | ||
| } | ||
| final Set<Cell> region = BFS.floodFill( | ||
| allPlotsWithPlant.iterator().next(), | ||
| cell -> cell.capitalNeighbours() | ||
| .filter(allPlotsWithPlant::contains)); | ||
| allPlotsWithPlant.removeAll(region); | ||
| return region; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean hasNext() { | ||
| return !allPlotsWithPlant.isEmpty() || keys.hasNext(); | ||
| } | ||
| }; | ||
| return Utils.stream(regions) | ||
| .mapToInt(region -> region.stream() | ||
| .mapToInt(plot -> count.applyAsInt(plot, region) * region.size()) | ||
| .sum()) | ||
| .sum(); | ||
| } | ||
|
|
||
| @Override | ||
| public Integer solvePart1(final List<String> input) { | ||
| final ToIntBiFunction<Cell, Set<Cell>> countEdges | ||
| = (plot, region) -> (4 - (int) plot.capitalNeighbours() | ||
| .filter(region::contains) | ||
| .count()); | ||
| return solve(input, countEdges); | ||
| } | ||
|
|
||
| @Override | ||
| public Integer solvePart2(final List<String> input) { | ||
| final Set<int[]> matches = Set.of( | ||
| new int[] {0, 0, 0}, new int[] {1, 0, 0}, new int[] {0, 1, 1}); | ||
| final ToIntBiFunction<Cell, Set<Cell>> countCorners | ||
| = (plot, region) -> ((int) CORNER_DIRS.stream() | ||
| .filter(d -> { | ||
| final int[] test = range(3).intStream() | ||
| .map(i -> region.contains(plot.at(d.get(i))) ? 1 : 0) | ||
| .toArray(); | ||
| return matches.stream().anyMatch(m -> Arrays.equals(m, test)); | ||
| }) | ||
| .count()); | ||
| return solve(input, countCorners); | ||
| } | ||
|
|
||
| @Override | ||
| @Samples({ | ||
| @Sample(method = "part1", input = TEST1, expected = "140"), | ||
| @Sample(method = "part1", input = TEST2, expected = "772"), | ||
| @Sample(method = "part1", input = TEST3, expected = "1930"), | ||
| @Sample(method = "part2", input = TEST1, expected = "80"), | ||
| @Sample(method = "part2", input = TEST2, expected = "436"), | ||
| @Sample(method = "part2", input = TEST3, expected = "1206"), | ||
| @Sample(method = "part2", input = TEST4, expected = "236"), | ||
| @Sample(method = "part2", input = TEST5, expected = "368"), | ||
| }) | ||
| public void samples() { | ||
| } | ||
|
|
||
| public static void main(final String[] args) throws Exception { | ||
| AoC2024_12.create().run(); | ||
| } | ||
|
|
||
| private static final String TEST1 = """ | ||
| AAAA | ||
| BBCD | ||
| BBCC | ||
| EEEC | ||
| """; | ||
| private static final String TEST2 = """ | ||
| OOOOO | ||
| OXOXO | ||
| OOOOO | ||
| OXOXO | ||
| OOOOO | ||
| """; | ||
| private static final String TEST3 = """ | ||
| RRRRIICCFF | ||
| RRRRIICCCF | ||
| VVRRRCCFFF | ||
| VVRCCCJFFF | ||
| VVVVCJJCFE | ||
| VVIVCCJJEE | ||
| VVIIICJJEE | ||
| MIIIIIJJEE | ||
| MIIISIJEEE | ||
| MMMISSJEEE | ||
| """; | ||
| private static final String TEST4 = """ | ||
| EEEEE | ||
| EXXXX | ||
| EEEEE | ||
| EXXXX | ||
| EEEEE | ||
| """; | ||
| private static final String TEST5 = """ | ||
| AAAAAA | ||
| AAABBA | ||
| AAABBA | ||
| ABBAAA | ||
| ABBAAA | ||
| AAAAAA | ||
| """; | ||
| } |