feat: day 1 completed both part 1 and part 2

01/HistorianHysteria/HistorianHysteria.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <NoWarn>CA1822</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <InternalsVisibleTo Include="$(AssemblyName).Tests" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Include="..\INPUT.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+
+</Project>

01/HistorianHysteria/Program.cs

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+using System.Diagnostics;
+
+using HistorianHysteria;
+
+if (args.Length is 0)
+{
+  Console.WriteLine("Please provide a path to the input file.");
+  return;
+}
+
+if (File.Exists(args[0]) is false)
+{
+  Console.WriteLine("The provided file does not exist.");
+  return;
+}
+
+var isPart2 = args.Length is 2 && args[1] is "part2";
+var input = await File.ReadAllLinesAsync(args[0]);
+
+var stopwatch = new Stopwatch();
+stopwatch.Start();
+
+var (left, right) = new PuzzleParser().Parse(input);
+
+if (isPart2)
+{
+  var similarityScore = new PuzzleSolver().CalculateSimilarityScore(left, right);
+  stopwatch.Stop();
+  Console.WriteLine($"The similarity score between the lists is {similarityScore}. ({stopwatch.ElapsedMilliseconds}ms)");
+}
+else
+{
+  var totalDistance = new PuzzleSolver().CalculateTotalDistance(left, right);
+  stopwatch.Stop();
+  Console.WriteLine($"The total distance between the lists is {totalDistance}. ({stopwatch.ElapsedMilliseconds}ms)");
+}

01/HistorianHysteria/PuzzleParser.cs

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+namespace HistorianHysteria;
+
+class PuzzleParser
+{
+  public (List<int> Left, List<int> Right) Parse(string[] lines)
+  {
+    var left = new List<int>();
+    var right = new List<int>();
+
+    foreach (var line in lines)
+    {
+      var numbers = line.Split()
+        .Where(s => string.IsNullOrWhiteSpace(s) is false)
+        .Select(int.Parse)
+        .ToArray();
+      
+      left.Add(numbers[0]);
+      right.Add(numbers[1]);
+    }
+
+    return (left, right);
+  }
+}

01/HistorianHysteria/PuzzleSolver.cs

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+class PuzzleSolver
+{
+  public int CalculateTotalDistance(List<int> left, List<int> right)
+  {
+    var leftSorted = left.OrderBy(i => i).ToList();
+    var rightSorted = right.OrderBy(i => i).ToList();
+    var total = 0;
+
+    foreach (var (leftNumber, index) in leftSorted.Select((num, index) => (num, index)))
+    {
+      var rightNumber = rightSorted[index];
+      total += Math.Abs(leftNumber - rightNumber);
+    }
+
+    return total;
+  }
+
+  public int CalculateSimilarityScore(List<int> left, List<int> right)
+  {
+    var total = 0;
+
+    foreach (var num in left)
+    {
+      var count = right.Count(i => i == num);
+      total += num * count;
+    }
+
+    return total;
+  }
+}