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Commit 6229d39

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day05 for AoC 2023 (part 1)
Took 1 hour 23 minutes
1 parent 773130c commit 6229d39

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package aminetti.adventofcode2024.day05;
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import aminetti.adventofcode2023.day05.SeedFertilizer;
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import com.google.common.collect.Lists;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.*;
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import java.util.function.Function;
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import java.util.stream.Collectors;
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public class Day05 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Day05.class);
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private List<String> input;
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private HashMap<String, List<String>> rules = new HashMap<>();
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private List<List<String>> allPages = new ArrayList<>();
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public Day05() {
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}
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public void parseInput(List<String> input) {
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this.input = input;
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var firstInputPart = true;
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for (String s : input) {
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if (firstInputPart) {
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if (s.isEmpty()) {
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firstInputPart = false;
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continue;
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}
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//LOGGER.debug("Line: {}", s);
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String[] split = s.split("\\|");
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List<String> currentRule = rules.getOrDefault(split[0], new ArrayList<>());
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currentRule.add(split[1]);
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rules.put(split[0], currentRule);
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} else {
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String[] split = s.split(",");
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allPages.add(Arrays.stream(split).toList());
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}
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}
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}
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public long solvePart1() {
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LOGGER.info("Rules: {}", rules);
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LOGGER.info("All pages: {}", allPages);
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long sum = 0;
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for (List<String> pageList : allPages) {
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if (isInOrder(pageList)) {
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String middlePage = pageList.get(pageList.size() / 2);
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LOGGER.info("Found ordered page: {}; adding {} to the sum", pageList, middlePage);
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sum += Long.parseLong(middlePage);
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}
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}
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return sum;
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}
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private boolean isInOrder(List<String> pageList) {
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Map<String, Integer> inEdgeCount = pageList.stream().collect(Collectors.toMap(Function.identity(), (x) -> 0));
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for (String p : rules.keySet()) {
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for (String v : rules.get(p)) {
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if (pageList.contains(v) && pageList.contains(p)) {
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inEdgeCount.put(v, inEdgeCount.get(v) + 1);
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}
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}
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}
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LOGGER.info("The pages {} have this inEdgeCount: {}", pageList, inEdgeCount);
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List<String> firstElements = inEdgeCount.entrySet().stream()
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.filter(e -> e.getValue() == 0)
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.map(Map.Entry::getKey)
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.collect(Collectors.toList());
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List<List<String>> partialOrder = new ArrayList<>();
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partialOrder.add(firstElements);
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for (int i = 0; i < partialOrder.size(); i++) {
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List<String> level = partialOrder.get(i);
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if (level.isEmpty()) {
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break;
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}
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List<String> nextLevel = new ArrayList<>();
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partialOrder.add(nextLevel);
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for (String e : level) {
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if (!rules.containsKey(e)) {
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continue;
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}
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for (String v : rules.get(e)) {
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if (!pageList.contains(v)) {
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continue;
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}
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Integer inEdgesForV = inEdgeCount.get(v);
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inEdgesForV--;
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inEdgeCount.put(v, inEdgesForV);
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if (inEdgesForV == 0) {
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nextLevel.add(v);
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}
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}
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}
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}
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int currentLevel = 0;
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for (String p : pageList) {
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while (!partialOrder.get(currentLevel).contains(p)) {
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LOGGER.info("{} is not in level [{}] {}, so switching to the next level", p, currentLevel, partialOrder.get(currentLevel));
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currentLevel++;
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if (currentLevel > partialOrder.size() - 1) {
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LOGGER.info("{} are NOT ordered", pageList);
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LOGGER.info(" current level {} and partialOrder {}", currentLevel, partialOrder);
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return false;
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}
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}
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}
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LOGGER.info("{} are ordered", pageList);
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return true;
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}
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public long solvePart2() {
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return 0;
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}
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}
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package aminetti.adventofcode2024.day05;
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import org.junit.jupiter.api.Test;
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import java.io.IOException;
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import java.util.List;
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import static java.nio.charset.StandardCharsets.UTF_8;
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import static org.apache.commons.io.IOUtils.readLines;
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import static org.apache.commons.io.IOUtils.resourceToString;
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import static org.hamcrest.MatcherAssert.assertThat;
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import static org.hamcrest.Matchers.is;
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class Day05Test {
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@Test
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void actualInputPart1() throws IOException {
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// given
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List<String> input = readLines(resourceToString("/day05/day05_input.txt", UTF_8));
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// when
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Day05 solver = new Day05();
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solver.parseInput(input);
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long l = solver.solvePart1();
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// then
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assertThat(l, is(0L));
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}
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@Test
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void testInputPart1() throws IOException {
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// given
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List<String> input = readLines(resourceToString("/day05/day05_input_test.txt", UTF_8));
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// when
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Day05 solver = new Day05();
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solver.parseInput(input);
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long l = solver.solvePart1();
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// then
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assertThat(l, is(143L));
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}
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@Test
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void actualInputPart2() throws IOException {
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// given
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List<String> input = readLines(resourceToString("/day05/day05_input.txt", UTF_8));
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// when
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Day05 solver = new Day05();
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solver.parseInput(input);
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long l = solver.solvePart2();
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// then
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assertThat(l, is(0L));
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}
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@Test
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void testInputPart2() throws IOException {
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// given
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List<String> input = readLines(resourceToString("/day05/day05_input_test.txt", UTF_8));
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// when
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Day05 solver = new Day05();
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solver.parseInput(input);
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long l = solver.solvePart2();
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// then
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assertThat(l, is(0L));
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}
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}
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47|53
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97|13
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97|61
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97|47
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75|29
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61|13
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75|53
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29|13
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97|29
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53|29
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61|53
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97|53
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61|29
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47|13
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75|47
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97|75
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47|61
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75|61
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47|29
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75|13
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53|13
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75,47,61,53,29
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97,61,53,29,13
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75,29,13
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75,97,47,61,53
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61,13,29
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97,13,75,29,47

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