day 1

src/aoc/Year2024/Day01/Day01.cs

@@ -2,18 +2,68 @@ namespace aoc.Year2024.Day01;
 
 internal partial class Day01
 {
-    internal partial class Part1
-    {
-        public string Solve(string input)
-        {
-            throw new NotImplementedException();
-        }
-    }
-    internal partial class Part2
-    {
-        public string Solve(string input)
-        {
-            throw new NotImplementedException();
-        }
-    }
-}
+	private static (int[] first, int[] second) ParseBase(string input)
+	{
+		var parser =
+			Numerics.IntegerInt32.ThenIgnore(SpanX.Space)
+				.Then(Numerics.IntegerInt32)
+				.Lines()
+				.Select(lines => (
+					lines.Select(x => x.Item1).ToArray(),
+					lines.Select(x => x.Item2).ToArray())
+				);
+
+		return parser.Parse(input);
+	}
+
+	internal partial class Part1
+	{
+		private readonly Example example = new(
+			"""
+			3   4
+			4   3
+			2   5
+			1   3
+			3   9
+			3   3
+			""", 11);
+
+		public (int[] first, int[] second) Parse(string input) => ParseBase(input);
+
+		public int Solve((int[] first, int[] second) input)
+		{
+			var totalDifference =
+				input.first.Order()
+					.Zip(input.second.Order(), Distance).Sum();
+
+			return totalDifference;
+
+			int Distance(int x, int y) => Math.Abs(x - y);
+		}
+	}
+
+	internal partial class Part2
+	{
+		private readonly Example example = new(
+			"""
+			3   4
+			4   3
+			2   5
+			1   3
+			3   9
+			3   3
+			""", 31);
+
+
+		public (int[] first, int[] second) Parse(string input) => ParseBase(input);
+
+		public int Solve((int[] first, int[] second) input)
+		{
+			var secondGroups = input.second.ToLookup(x => x);
+
+			var similarityScore = input.first.Select(x => x * secondGroups[x].Count()).Sum();
+
+			return similarityScore;
+		}
+	}
+}

tests/AoC.Tests/AoC.Tests.csproj

@@ -23,6 +23,11 @@
     <ItemGroup>
         <ProjectReference Include="..\..\src\aoc\aoc.csproj"/>
     </ItemGroup>
+  <ItemGroup>
+    <None Update="inputs\*.txt">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
     <ItemGroup>
         <Using Include="NUnit.Framework"/>
     </ItemGroup>

tests/AoC.Tests/InputTests.cs

@@ -8,6 +8,7 @@ internal partial class InputTests
 {
     private static IEnumerable<PartInputCaseData> GetCases()
     {
-        yield break;
+	    yield return new PartInputCaseData(1, 1, "1889772");
+	    yield return new PartInputCaseData(1, 2, "23228917");
     }
 }