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AoC2019_11.java
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AoC2019_11.java
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import static java.util.stream.Collectors.toSet;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import com.github.pareronia.aoc.CharGrid;
import com.github.pareronia.aoc.OCR;
import com.github.pareronia.aoc.geometry.Draw;
import com.github.pareronia.aoc.geometry.Position;
import com.github.pareronia.aoc.geometry.Turn;
import com.github.pareronia.aoc.intcode.IntCode;
import com.github.pareronia.aoc.navigation.Heading;
import com.github.pareronia.aoc.navigation.NavigationWithHeading;
import com.github.pareronia.aocd.Aocd;
import com.github.pareronia.aocd.Puzzle;
public class AoC2019_11 extends AoCBase {
private static final long BLACK = 0;
private static final long WHITE = 1;
private static final long LEFT = 0;
private static final char FILL = '\u2592';
private static final char EMPTY = ' ';
private final List<Long> program;
private AoC2019_11(final List<String> input, final boolean debug) {
super(debug);
assert input.size() == 1;
this.program = IntCode.parse(input.get(0));
}
public static AoC2019_11 create(final List<String> input) {
return new AoC2019_11(input, false);
}
public static AoC2019_11 createDebug(final List<String> input) {
return new AoC2019_11(input, true);
}
private PaintJob paint(final long start) {
final Set<Position> white = new HashSet<>();
final NavigationWithHeading nav
= new NavigationWithHeading(Position.of(0, 0), Heading.NORTH);
final IntCode intCode = new IntCode(this.program, false);
final Deque<Long> input = new ArrayDeque<>(List.of(start));
final Deque<Long> output = new ArrayDeque<>();
do {
intCode.runTillInputRequired(input, output);
if (output.pop() == WHITE) {
white.add(nav.getPosition());
} else {
white.remove(nav.getPosition());
}
nav.turn(output.pop() == LEFT ? Turn.LEFT : Turn.RIGHT);
nav.forward(1);
input.add(white.contains(nav.getPosition()) ? 1L : 0L);
intCode.runTillInputRequired(input, output);
} while (!intCode.isHalted());
final Set<Position> visited = nav.getVisitedPositions(false).stream()
.distinct().collect(toSet());
return new PaintJob(visited, white);
}
@Override
public Integer solvePart1() {
return paint(BLACK).visited.size();
}
@Override
public String solvePart2() {
final List<String> drawing = Draw.draw(paint(WHITE).white, FILL, EMPTY);
drawing.forEach(this::log);
return OCR.convert6(CharGrid.from(drawing), FILL, EMPTY);
}
public static void main(final String[] args) throws Exception {
final Puzzle puzzle = Aocd.puzzle(2019, 11);
final List<String> inputData = puzzle.getInputData();
puzzle.check(
() -> lap("Part 1", AoC2019_11.create(inputData)::solvePart1),
() -> lap("Part 2", AoC2019_11.createDebug(inputData)::solvePart2)
);
}
record PaintJob(Set<Position> visited, Set<Position> white) { }
}