adventofcode/src/main/java/AoC2017_13.java at main · pareronia/adventofcode · GitHub

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import com.github.pareronia.aoc.MutableInt;

import com.github.pareronia.aoc.StringOps;

import com.github.pareronia.aoc.StringOps.StringSplit;

import com.github.pareronia.aoc.solution.Sample;

import com.github.pareronia.aoc.solution.Samples;

import com.github.pareronia.aoc.solution.SolutionBase;

import java.util.List;

@SuppressWarnings({"PMD.ClassNamingConventions", "PMD.NoPackage"})

public final class AoC2017_13 extends SolutionBase<List<AoC2017_13.Layer>, Integer, Integer> {

private AoC2017_13(final boolean debug) {

super(debug);

}

public static AoC2017_13 create() {

return new AoC2017_13(false);

}

public static AoC2017_13 createDebug() {

return new AoC2017_13(true);

}

@Override

protected List<Layer> parseInput(final List<String> inputs) {

return inputs.stream().map(Layer::fromInput).toList();

}

private boolean caught(final Layer layer, final int delay) {

return (delay + layer.depth) % ((layer.range - 1) * 2) == 0;

}

@Override

public Integer solvePart1(final List<Layer> layers) {

return layers.stream()

.filter(layer -> caught(layer, 0))

.mapToInt(l -> l.depth * l.range)

.sum();

}

@Override

public Integer solvePart2(final List<Layer> layers) {

final MutableInt delay = new MutableInt(0);

while (layers.stream().anyMatch(layer -> caught(layer, delay.intValue()))) {

delay.increment();

}

return delay.intValue();

}

@Samples({

@Sample(method = "part1", input = TEST, expected = "24"),

@Sample(method = "part2", input = TEST, expected = "10"),

})

public static void main(final String[] args) throws Exception {

create().run();

}

private static final String TEST =

"""

0: 3

1: 2

4: 4

6: 4

""";

record Layer(int depth, int range) {

public static Layer fromInput(final String input) {

final StringSplit sp = StringOps.splitOnce(input, ": ");

return new Layer(Integer.parseInt(sp.left()), Integer.parseInt(sp.right()));

}

adventofcode/src/main/java/AoC2017_13.java at main · pareronia/adventofcode · GitHub

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