Day 1 - Part 2

day1/part2/Program.cs

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+using System.Globalization;
+
+namespace part2;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        // The description does not say this (had to go to reddit to find this)
+        // but the strings can combine the same letter for 2 unique numbers
+        // i.e. sevenine is "79" not "7ine"
+
+        int sum = 0;
+
+        string letters = "abcdefghijklmnopqrstuvwxyz";
+        Dictionary<string, int> written_numbers = new() {
+            {"one", 1},
+            {"two", 2},
+            {"three", 3},
+            {"four", 4},
+            {"five", 5},
+            {"six", 6},
+            {"seven", 7},
+            {"eight", 8},
+            {"nine", 9}
+        };
+
+        StreamReader sr = new StreamReader("input");
+        String line = sr.ReadLine();
+        //Continue to read until you reach end of file
+        while (line != null)
+        {
+            line = line.ToLower();
+            List<int> numbers_in_line = [];
+
+            for(int i = 0; i < line.Length; i++) {
+                foreach(var number in written_numbers) {
+                    if(line[i] == number.Key[0]) {
+                        if(string.Compare(line, i, number.Key, 0, number.Key.Length) == 0) {
+                            numbers_in_line.Add(number.Value);
+                        }
+                    }
+
+                    if(char.IsNumber(line[i])) {
+                        numbers_in_line.Add(Int32.Parse(line[i].ToString()));
+                    }
+                }
+            }
+
+            sum += numbers_in_line.First() * 10;
+            sum += numbers_in_line.Last();
+
+            Console.WriteLine($"Line: {line} - Sum: {sum}");
+            line = sr.ReadLine();
+        }
+        //close the file
+        sr.Close();
+
+        Console.WriteLine($"Total Sum: {sum}");
+    }
+}

day1/part2/part2.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>
+
+</Project>

day1/part2/part2.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.002.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "part2", "part2.csproj", "{77D1FD2B-3DFB-4114-B145-CE3B20D4EE36}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{77D1FD2B-3DFB-4114-B145-CE3B20D4EE36}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{77D1FD2B-3DFB-4114-B145-CE3B20D4EE36}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{77D1FD2B-3DFB-4114-B145-CE3B20D4EE36}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{77D1FD2B-3DFB-4114-B145-CE3B20D4EE36}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {DA83D587-7910-47BE-BE85-B085901ED607}
+	EndGlobalSection
+EndGlobal