Add project files.

.idea/.idea.AdventOfCode2024/.idea/.gitignore

@@ -0,0 +1,13 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Rider ignored files
+/contentModel.xml
+/.idea.AdventOfCode2024.iml
+/modules.xml
+/projectSettingsUpdater.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/.idea.AdventOfCode2024/.idea/encodings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" addBOMForNewFiles="with BOM under Windows, with no BOM otherwise" />
+</project>

.idea/.idea.AdventOfCode2024/.idea/indexLayout.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="UserContentModel">
+    <attachedFolders />
+    <explicitIncludes />
+    <explicitExcludes />
+  </component>
+</project>

.idea/.idea.AdventOfCode2024/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

AdventOfCode2024.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.11.35312.102
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Day1", "Day1\Day1.csproj", "{B9B134C5-93CB-4F54-90F6-FA911A04BDA5}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B9B134C5-93CB-4F54-90F6-FA911A04BDA5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B9B134C5-93CB-4F54-90F6-FA911A04BDA5}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B9B134C5-93CB-4F54-90F6-FA911A04BDA5}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B9B134C5-93CB-4F54-90F6-FA911A04BDA5}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {8A2CDA81-8B9A-4F96-AE18-A11BC68BF332}
+	EndGlobalSection
+EndGlobal

Day1/Day1.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Update="input.txt">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>

Day1/Program.cs

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+var lines = File.ReadAllLines("input.txt");
+
+var parts = lines.Select(line => (line.Split("   ")[0], line.Split("   ")[1])).ToList();
+var list1 = parts.Select(part => int.Parse(part.Item1)).Order().ToList();
+var list2 = parts.Select(part => int.Parse(part.Item2)).Order().ToList();
+int distance = 0, similarityScore = 0;
+
+for (var i = 0; i < list1.Count; i++)
+{
+    distance += Math.Abs(list1[i] - list2[i]);
+    similarityScore += list1[i] * list2.Count(item => item == list1[i]);
+}
+
+Console.WriteLine($"Part 1 : {distance}\nPart 2 : {similarityScore}");