Day 1

src/01.cs

@@ -0,0 +1,31 @@
+namespace aoc2024;
+
+internal class Day01 : Day
+{
+    private readonly List<long> list1 = [];
+    private readonly List<long> list2 = [];
+    internal override void Parse()
+    {
+        var lines = Util.Parsing.ReadAllLines($"{GetDay()}");
+        foreach (var line in lines)
+        {
+            var vals = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+            list1.Add(long.Parse(vals[0]));
+            list2.Add(long.Parse(vals[1]));
+        }
+    }
+
+    internal override string Part1()
+    {
+        list1.Sort();
+        list2.Sort();
+        long totalDist = list1.Select((num1, idx) => Math.Abs(num1 - list2[idx])).Sum();
+        return $"Total distance between lists: <+white>{totalDist}";
+    }
+
+    internal override string Part2()
+    {
+        long score = list1.Aggregate(0L, (accum, num1) => accum + num1 * list2.Count(num2 => num2 == num1));
+        return $"Lists similarity score: <+white>{score}";
+    }
+}