Initial commit.

.gitignore

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+*.swp
+*.*~
+project.lock.json
+.DS_Store
+*.pyc
+
+# Visual Studio Code
+.vscode
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+build/
+bld/
+[Bb]in/
+[Oo]bj/
+msbuild.log
+msbuild.err
+msbuild.wrn
+
+# Visual Studio 2015
+.vs/

AoC2018.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.26430.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AoC2018", "AoC2018\AoC2018.csproj", "{ECD52B05-8FB6-4B9C-80AD-1AB5C2807EAA}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AoC2018Test", "AoC2018Test\AoC2018Test.csproj", "{DC118C5C-268B-4ABD-A5E6-048B8DE5AC27}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{ECD52B05-8FB6-4B9C-80AD-1AB5C2807EAA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{ECD52B05-8FB6-4B9C-80AD-1AB5C2807EAA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{ECD52B05-8FB6-4B9C-80AD-1AB5C2807EAA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{ECD52B05-8FB6-4B9C-80AD-1AB5C2807EAA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{DC118C5C-268B-4ABD-A5E6-048B8DE5AC27}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DC118C5C-268B-4ABD-A5E6-048B8DE5AC27}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DC118C5C-268B-4ABD-A5E6-048B8DE5AC27}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DC118C5C-268B-4ABD-A5E6-048B8DE5AC27}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

AoC2018/AoC2018.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp1.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Update="Input\Day1Input.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>

AoC2018/Program.cs

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+using System;
+using System.Reflection;
+using AoC2018.Solutions;
+
+namespace AoC2018
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            // Find all classes inheriting from Solution, create an instance, and execute Run method.
+            foreach (Type t in Assembly.GetEntryAssembly().ExportedTypes)
+            {
+                if (t.GetTypeInfo().IsSubclassOf(typeof(Solution)))
+                {
+                    Solution solution = Activator.CreateInstance(t) as Solution;
+
+                    Console.WriteLine("-----------------------------------------------------------");
+                    Console.WriteLine($"Day {solution.Day} - {solution.Title}");
+                    Console.WriteLine("-----------------------------------------------------------");
+
+                    solution.Run();
+
+                    Console.WriteLine();
+                }
+            }
+            Console.ReadLine();
+        }
+    }
+}

AoC2018/Solutions/Day1Solution.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AoC2018.Solutions
+{
+    public class Day1Solution : Solution
+    {
+        public override string Title => "Chronal Calibration";
+
+        public override int Day => 1;
+
+        public override void Run()
+        {
+            string[] input = File.ReadAllLines(Path.Combine("Input", "Day1Input.txt"));
+            Dictionary<int, int> frequencyOccurrences = new Dictionary<int, int>();
+            int part1Result = 0, part2Result = 0;
+            bool part2Flag = false;
+
+            for (var i = 0; i < input.Length; i++)
+            {
+                part1Result += int.Parse(input[i]);
+            }
+            Console.WriteLine($"Part 1 Result: {part1Result}");
+
+            part1Result = 0;
+            while (!part2Flag)
+            {
+                for (var i = 0; i < input.Length; i++)
+                {
+                    part1Result += int.Parse(input[i]);
+
+                    if (!frequencyOccurrences.ContainsKey(part1Result))
+                        frequencyOccurrences.Add(part1Result, 0);
+
+                    frequencyOccurrences[part1Result]++;
+
+                    if (frequencyOccurrences[part1Result] > 1)
+                    {
+                        part2Flag = true;
+                        part2Result = part1Result;
+                        break;
+                    }
+                }
+            }
+
+            Console.WriteLine($"Part 2 Result: {part2Result}");
+        }
+    }
+}

AoC2018/Solutions/Solution.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace AoC2018.Solutions
+{
+    public abstract class Solution
+    {
+        public abstract string Title { get; }
+        public abstract int Day { get; }
+
+        public abstract void Run();
+    }
+}

AoC2018Test/AoC2018Test.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>    
+    <TargetFramework>netcoreapp1.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="1.1.11" />
+    <PackageReference Include="MSTest.TestFramework" Version="1.1.11" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\AoC2018\AoC2018.csproj" />
+  </ItemGroup>
+
+</Project>

AoC2018Test/UnitTest1.cs

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+using System;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AoC2018Test
+{
+    [TestClass]
+    public class UnitTest1
+    {
+        [TestMethod]
+        public void TestMethod1()
+        {
+        }
+    }
+}