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Commit360dc68

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day 14 part 1
1 parente66e8d1 commit360dc68

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4 files changed

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4 files changed

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packagecom.codefork.aoc2024.day14;
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importcom.codefork.aoc2024.Problem;
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importcom.codefork.aoc2024.util.Assert;
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importjava.util.stream.Stream;
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publicclassPart01extendsProblem {
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publicStringsolve(intwidth,intheight,Stream<String>data) {
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varswarm =Swarm.create(data,width,height);
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varfinalSwarm =swarm.doMoves(100);
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returnString.valueOf(finalSwarm.getSafetyFactor());
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}
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@Override
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publicStringsolve() {
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Assert.assertEquals("12",solve(11,7,getSampleInput()));
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returnsolve(101,103,getInput());
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}
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publicstaticvoidmain(String[]args) {
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newPart01().run();
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}
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}
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packagecom.codefork.aoc2024.day14;
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importcom.codefork.aoc2024.util.Maps;
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importjava.util.List;
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importjava.util.Map;
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importjava.util.regex.Pattern;
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importjava.util.stream.Collectors;
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importjava.util.stream.IntStream;
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importjava.util.stream.Stream;
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importstaticcom.codefork.aoc2024.util.FoldLeft.foldLeft;
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publicrecordSwarm(List<Robot>robots,intwidth,intheight) {
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publicrecordPosition(intx,inty) {
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}
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publicrecordVelocity(intdx,intdy) {
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}
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publicrecordRobot(Positionposition,Velocityv) {
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}
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privatefinalstaticPatternpat =Pattern.compile("p=([0-9]+),([0-9]+) v=([0-9\\-]+),([0-9\\-]+)");
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publicstaticSwarmcreate(Stream<String>data,intwidth,intheight) {
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varrobots =data
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.map(line -> {
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varmatcher =pat.matcher(line);
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if (!matcher.find()) {
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thrownewRuntimeException("couldn't parse line");
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}
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varparts =IntStream.range(1,5)
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.mapToObj(matcher::group)
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.map(Integer::valueOf)
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.toList();
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returnnewRobot(newPosition(parts.get(0),parts.get(1)),newVelocity(parts.get(2),parts.get(3)));
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})
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.toList();
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returnnewSwarm(robots,width,height);
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}
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publicSwarmdoMoves(intn) {
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varfinalRobots =IntStream.range(0,n)
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.boxed()
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.collect(foldLeft(
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() ->robots,
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(acc,i) -> {
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returnacc.stream().map(this::move).toList();
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}
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));
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returnnewSwarm(finalRobots,width,height);
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}
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publicRobotmove(Robotrobot) {
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varchangedX =robot.position().x() +robot.v().dx();
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varnewX =changedX >=width ?changedX -width : (changedX <0 ?changedX +width :changedX);
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varchangedY = (robot.position().y() +robot.v().dy()) %height;
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varnewY =changedY >=height ?changedY -height : (changedY <0 ?changedY +height :changedY);
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returnnewRobot(newPosition(newX,newY),robot.v());
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}
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publicvoidprint() {
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varbyPos =robots().stream().collect(Collectors.toMap(
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Robot::position,
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List::of,
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Maps::listConcat));
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for (vary =0;y <height;y++) {
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for (varx =0;x <width;x++) {
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varlist =byPos.getOrDefault(newPosition(x,y),List.of());
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varcount =list.size();
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varch =count >0 ?String.valueOf(count) :".";
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System.out.print(ch);
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}
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System.out.println();
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}
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}
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privatestaticintDISCARD = -1;
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/**
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* quadrants are numbered in order from left to right, then top to bottom, like reading English
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* @return
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*/
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publicMap<Integer,Integer>getQuadrantCounts() {
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varbyQuadrant =robots.stream()
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.collect(Collectors.groupingBy(
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(robot) -> {
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if (robot.position().y() <height /2) {
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if (robot.position().x() <width /2) {
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return0;
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}elseif (robot.position().x() >width /2) {
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return1;
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}
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}elseif (robot.position().y() >height /2) {
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if (robot.position().x() <width /2) {
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return2;
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}elseif (robot.position().x() >width /2) {
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return3;
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}
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}
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// put the robots on the center lines in a separate group
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// that we'll discard
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returnDISCARD;
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})
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);
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returnbyQuadrant.entrySet().stream()
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.filter(entry ->entry.getKey() !=DISCARD)
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.collect(Collectors.toMap(
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Map.Entry::getKey,
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entry ->entry.getValue().size(),
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Integer::sum
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));
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}
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/**
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* testing for part 2: try smaller sections
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*/
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publicMap<Integer,Integer>getCustomSectionCounts() {
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varbyQuadrant =robots.stream()
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.collect(Collectors.groupingBy(
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(robot) -> {
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if (robot.position().y() <height /3) {
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if (robot.position().x() <width /2) {
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return0;
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}elseif (robot.position().x() >width /2) {
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return1;
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}
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}elseif (robot.position().y() >height /3 &&robot.position().y() < (height /3) *2) {
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if (robot.position().x() <width /2) {
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return2;
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}elseif (robot.position().x() >width /2) {
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return3;
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}
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}elseif (robot.position().y() > (height /3) *2) {
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if (robot.position().x() <width /2) {
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return4;
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}elseif (robot.position().x() >width /2) {
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return5;
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}
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}
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// put the robots on the center lines in a separate group
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// that we'll discard
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returnDISCARD;
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})
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);
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returnbyQuadrant.entrySet().stream()
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.filter(entry ->entry.getKey() !=DISCARD)
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.collect(Collectors.toMap(
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Map.Entry::getKey,
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entry -> {
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// count occupied positions rather than robots, since they can be stacked, and we only
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// care about what they look like from above
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recordPos(intx,inty) {
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}
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varlist =entry.getValue();
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varoccupiedPositions =list.stream()
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.map(robot ->newPos(robot.position().x(),robot.position().y()))
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.collect(Collectors.toSet());
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returnoccupiedPositions.size();
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},
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Integer::sum
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));
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}
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publicintgetSafetyFactor() {
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returngetQuadrantCounts().entrySet().stream()
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.reduce(1, (acc,entry) ->acc *entry.getValue(),Integer::sum);
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}
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}

‎src/main/resources/day14/input‎

8.17 KB
Binary file not shown.

‎src/main/resources/day14/sample‎

182 Bytes
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