aoc 2024 tooling and day 1

Author: jacobsandersen

src/main/java/dev/jacobandersen/codechallenges/challenge/adventofcode/AdventOfCodeBootstrap.java

@@ -4,6 +4,7 @@
 import dev.jacobandersen.codechallenges.challenge.adventofcode.year2020.Year2020;
 import dev.jacobandersen.codechallenges.challenge.adventofcode.year2022.Year2022;
 import dev.jacobandersen.codechallenges.challenge.adventofcode.year2023.Year2023;
+import dev.jacobandersen.codechallenges.challenge.adventofcode.year2024.Year2024;
 import dev.jacobandersen.codechallenges.util.CombinatoricsUtil;
 
 import java.util.List;
@@ -23,9 +24,10 @@ public void run() {
  new Dummy().m();
  }
 
- Year2015.getDays().forEach(Day::run);
- Year2020.getDays().forEach(Day::run);
- Year2022.getDays().forEach(Day::run);
- Year2023.getDays().forEach(Day::run);
+// Year2015.getDays().forEach(Day::run);
+// Year2020.getDays().forEach(Day::run);
+// Year2022.getDays().forEach(Day::run);
+// Year2023.getDays().forEach(Day::run);
+ Year2024.getDays().forEach(Day::run);
  }
 }

src/main/java/dev/jacobandersen/codechallenges/challenge/adventofcode/year2024/Year2024.java

@@ -0,0 +1,14 @@
+package dev.jacobandersen.codechallenges.challenge.adventofcode.year2024;
+
+import dev.jacobandersen.codechallenges.challenge.adventofcode.Day;
+import dev.jacobandersen.codechallenges.challenge.adventofcode.year2024.day1.Day1;
+
+import java.util.List;
+
+public class Year2024 {
+ public static List<Day> getDays() {
+ return List.of(
+ new Day1()
+ );
+ }
+}

src/main/java/dev/jacobandersen/codechallenges/challenge/adventofcode/year2024/day1/Day1.java

@@ -0,0 +1,57 @@
+package dev.jacobandersen.codechallenges.challenge.adventofcode.year2024.day1;
+
+import dev.jacobandersen.codechallenges.challenge.adventofcode.Day;
+import dev.jacobandersen.codechallenges.util.Pair;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class Day1 extends Day {
+ public Day1() {
+ super(2024, 1, "Historian Hysteria");
+ }
+
+ private Pair<List<Integer>, List<Integer>> getLists() {
+ final List<Integer> a = new ArrayList<>(), b = new ArrayList<>();
+
+ getInputLinesStreamNoBlanks()
+ .map(line -> line.replaceAll(" +", " ").split(" "))
+ .map(arr -> new Integer[] { Integer.parseInt(arr[0]), Integer.parseInt(arr[1]) })
+ .forEach(arr -> {
+ a.add(arr[0]);
+ b.add(arr[1]);
+ });
+
+ return new Pair<>(a, b);
+ }
+
+ @Override
+ public String partOne() {
+ final Pair<List<Integer>, List<Integer>> lists = getLists();
+
+ lists.first().sort(Integer::compareTo);
+ lists.second().sort(Integer::compareTo);
+
+ final List<Integer> differences = new ArrayList<>();
+ for (int i = 0; i < lists.first().size() && i < lists.second().size(); i++) {
+ differences.add(Math.abs(lists.first().get(i) - lists.second().get(i)));
+ }
+
+ return String.valueOf(differences.stream().mapToInt(Integer::intValue).sum());
+ }
+
+ @Override
+ public String partTwo() {
+ final Pair<List<Integer>, List<Integer>> lists = getLists();
+
+ return String.valueOf(
+ lists.first().stream()
+ .mapToLong(leftNum ->
+ leftNum * lists.second()
+ .stream()
+ .filter(rightNum -> Objects.equals(rightNum, leftNum))
+ .count()).sum()
+ );
+ }
+}

src/main/java/dev/jacobandersen/codechallenges/util/Pair.java

@@ -0,0 +1,19 @@
+package dev.jacobandersen.codechallenges.util;
+
+public class Pair<T,R> {
+ private final T first;
+ private final R second;
+
+ public Pair(T first, R second) {
+ this.first = first;
+ this.second = second;
+ }
+
+ public T first() {
+ return first;
+ }
+
+ public R second() {
+ return second;
+ }
+}