Day 1

l0s · l0s · commit e6d94df73ee3 · 2022-11-30T21:28:53.000-08:00
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
         distribution: 'temurin'
         java-version: '19'
         check-latest: true
-    - uses: actions/cache@v2
+    - uses: actions/cache@v3
       with:
         path: ~/.m2
         key: m2-${{ runner.os }}-19-${{ hashFiles('**/pom.xml') }}
diff --git a/src/test/java/com/macasaet/Day01.java b/src/test/java/com/macasaet/Day01.java
@@ -1,43 +1,76 @@
 package com.macasaet;
 
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
+import java.math.BigInteger;
 import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Iterator;
 import java.util.List;
 import java.util.stream.StreamSupport;
 
 /**
- * --- Day 1:  ---
+ * --- Day 1: Calorie Counting ---
  */
 public class Day01 {
 
-    /**
-     *
-     *
-     * @return
-     */
-    protected List<String> getInput() {
+    protected Iterator<String> getInput() {
         return StreamSupport
                 .stream(new LineSpliterator("day-01.txt"),
                         false)
-                .collect(ArrayList::new, List::add, List::addAll);
+                .iterator();
+    }
+
+    protected List<Elf> getElves() {
+        var calories = new ArrayList<BigInteger>();
+        final var elves = new ArrayList<Elf>();
+        for (final var i = getInput(); i.hasNext(); ) {
+            final var line = i.next();
+            if (line.isBlank()) {
+                elves.add(new Elf(Collections.unmodifiableList(calories)));
+                calories = new ArrayList<>();
+            } else {
+                calories.add(new BigInteger(line.strip()));
+            }
+        }
+        if (!calories.isEmpty()) {
+            elves.add(new Elf(Collections.unmodifiableList(calories)));
+        }
+        return Collections.unmodifiableList(elves);
     }
 
-    @Disabled
     @Test
     public final void part1() {
-        final var list = getInput();
+        final var elves = getElves();
+        final var elf = elves.stream()
+                .max(Comparator.comparing(Elf::totalCaloriesCarried))
+                .get();
 
-        System.out.println("Part 1: " + null);
+        System.out.println("Part 1: " + elf.totalCaloriesCarried());
     }
 
-    @Disabled
     @Test
     public final void part2() {
-        final var list = getInput();
+        final var elves = getElves();
+        final var list = elves.stream()
+                .sorted(Comparator.comparing(Elf::totalCaloriesCarried).reversed())
+                .toList();
 
-        System.out.println("Part 2: " + null);
+        System.out.println("Part 2: " + (list.get(0).totalCaloriesCarried().add(list.get(1).totalCaloriesCarried()).add(list.get(2).totalCaloriesCarried())));
+    }
+
+    /**
+     * An elf who collects food for the reindeer.
+     *
+     * @param itemCalories The number of calories of each item carried by the elf
+     */
+    public record Elf(List<BigInteger> itemCalories) {
+        public BigInteger totalCaloriesCarried() {
+            return itemCalories().stream()
+                    .reduce(BigInteger::add)
+                    .get();
+        }
     }
 
 }
diff --git a/src/test/resources/sample/day-01.txt b/src/test/resources/sample/day-01.txt
@@ -0,0 +1,14 @@
+1000
+2000
+3000
+
+4000
+
+5000
+6000
+
+7000
+8000
+9000
+
+10000

-Original file line number
+Diff line change
@@ @@ -0,0 +1,14 @@ @@
 +1000
 +2000
 +3000
++
 +4000
++
 +5000
 +6000
++
 +7000
 +8000
 +9000
++
 +10000