Initial Commit

2023/Day01CSharp/Day01CSharp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\AdventCommon\AdventCommon.csproj" />
+  </ItemGroup>
+
+</Project>

2023/Day01CSharp/Program.cs

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+// See https://aka.ms/new-console-template for more information
+using AdventCommon;
+
+/** P1 **/
+var p1exampleSln = Part01(new AdventCommon.PuzzleInput("example-input.txt"));
+var p1puzzleSln = Part01(new AdventCommon.PuzzleInput("puzzle-input.txt"));
+
+Console.WriteLine("Part01 Example Sum: " + p1exampleSln);
+Console.WriteLine("Part01 Puzzle Sum: " + p1puzzleSln);
+
+/** P2 **/
+var p2exampleSln = Part02(new AdventCommon.PuzzleInput("example-input-2.txt"));
+var p2puzzleSln = Part02(new AdventCommon.PuzzleInput("puzzle-input.txt"));
+
+Console.WriteLine("Part02 Example Sum: " + p2exampleSln);
+Console.WriteLine("Part02 Puzzle Sum: " + p2puzzleSln);
+
+int Part01(PuzzleInput input)
+{
+    int sum = 0;
+
+    foreach (var line in input.Lines)
+    {
+        int num = 0;
+
+        // Left digit
+        for (int i = 0;  i < line.Length; i++)
+        {
+            if (Char.IsDigit(line[i]))
+            {
+                num += 10 * (line[i] - '0');
+                break;
+            }
+        }
+
+        // Right digit
+        for (int i = line.Length-1; i >= 0; i--)
+        {
+            if (Char.IsDigit(line[i]))
+            {
+                num += line[i] - '0';
+                break;
+            }
+        }
+
+        sum += num;
+    }
+
+    return sum;
+}
+
+int Part02(PuzzleInput input)
+{
+    int sum = 0;
+
+    foreach (var line in input.Lines)
+    {
+        int num = 0;
+
+        // Left digit
+        for (int i = 0; i < line.Length; i++)
+        {
+            var val = ReadInteger(line, i);
+
+            if (val != -1)
+            {
+                num += 10 * val;
+                break;
+            }
+        }
+
+        // Right digit
+        for (int i = line.Length - 1; i >= 0; i--)
+        {
+            var val = ReadInteger(line, i);
+
+            if (val != -1)
+            {
+                num += val;
+                break;
+            }
+        }
+
+        sum += num;
+    }
+
+    return sum;
+}
+
+int ReadInteger(string line, int index)
+{
+    // If its a digit, we done
+    if (Char.IsDigit(line[index]))
+    {
+        return line[index] - '0';
+    }
+    else
+    {
+        // Ok read string
+        int number_index = 1;
+        var number = new string[] { "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
+
+        foreach (var num in number)
+        {
+            if (index + num.Length <= line.Length)
+            {
+                bool found = true;
+
+                for (int i = 0; i < num.Length && (index + i) < line.Length; i++)
+                {
+                    if (num[i] != line[index + i])
+                    {
+                        found = false;
+                        break;
+                    }
+                }
+
+                if (found)
+                {
+                    return number_index;
+                }
+            }
+
+            number_index++;
+        }
+    }
+
+    return -1;
+}

2023/Day01CSharp/Properties/launchSettings.json

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+{
+  "profiles": {
+    "Day01CSharp": {
+      "commandName": "Project",
+      "workingDirectory": "C:\\dev\\DevSandbox\\AdventOfCode\\2023\\Day01CSharp"
+    }
+  }
+}

2023/Day01CSharp/example-input-2.txt

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+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen

2023/Day01CSharp/example-input.txt

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+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet