Initial Days

Day1/Day1.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="TUnit" Version="0.4.51" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <None Update="input.txt">
+        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      </None>
+    </ItemGroup>
+
+</Project>

Day1/Program.cs

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+string[] inputs = File.ReadAllLines("input.txt");
+
+var a = new List<int>();
+var b = new List<int>();
+foreach (string input in inputs)
+{
+    string[] tokens = input.Split(" ", StringSplitOptions.RemoveEmptyEntries);
+    a.Add(int.Parse(tokens[0]));
+    b.Add(int.Parse(tokens[1]));
+}
+
+a = a.OrderBy(x => x).ToList();
+b = b.OrderBy(x => x).ToList();
+        
+int totalDistance = a.Select((t, i) => Math.Abs(t - b[i])).Sum();
+
+Console.WriteLine(totalDistance);
+
+var aBucket = a.GroupBy(x => x);
+var star2 = aBucket.Select(bucket => bucket.Key * b.Count(x => x == bucket.Key) * bucket.Count()).Sum();
+Console.WriteLine(star2);