Day 1 solution

Day1/CalibrationExtractor.cs

@@ -0,0 +1,35 @@
+using System.Text.RegularExpressions;
+
+namespace Day1;
+
+public class CalibrationExtractor
+{
+    private readonly string _fileName;
+    private readonly DigitTransformer _transformer;
+    private readonly Regex _nonDigit = new Regex(@"[^\d]", RegexOptions.Compiled);
+
+    public CalibrationExtractor(string fileName, DigitTransformer transformer = null)
+    {
+        _fileName = fileName;
+        _transformer = transformer;
+    }
+
+    public IEnumerable<int> Extract()
+    {
+        using var reader = File.OpenText(_fileName);
+        while (!reader.EndOfStream)
+        {
+            var line = reader.ReadLine();
+            if (_transformer != null)
+            {
+                line = _transformer.Replace(line);
+            }
+            var calibrationValueStr = _nonDigit.Replace(line, "");
+            if (calibrationValueStr.Length < 1)
+            {
+                throw new InvalidOperationException($"Not enough digits: '{line}'");
+            }
+            yield return int.Parse(new string(new char[] { calibrationValueStr.First(), calibrationValueStr.Last() }));
+        }
+    }
+}

Day1/Day1.csproj

@@ -7,4 +7,16 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Update="sample-input.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="lan-input.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="sample-input2.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
 </Project>

Day1/DigitTransformer.cs

@@ -0,0 +1,45 @@
+using System.Text;
+
+namespace Day1;
+
+public class DigitTransformer
+{
+    private static readonly Dictionary<string, string> _digits = new Dictionary<string, string>
+    {
+        ["one"] = "1",
+        ["two"] = "2",
+        ["three"] = "3",
+        ["four"] = "4",
+        ["five"] = "5",
+        ["six"] = "6",
+        ["seven"] = "7",
+        ["eight"] = "8",
+        ["nine"] = "9",
+    };
+
+    public string Replace(string input)
+    {
+        var result = new StringBuilder();
+        for (var i = 0; i < input.Length; i++)
+        {
+            var current = input.Substring(i);
+            var next = false;
+            foreach (var kvp in _digits)
+            {
+                if (current.StartsWith(kvp.Key))
+                {
+                    result.Append(kvp.Value);
+                    next = true;
+                    break;
+                }
+            }
+
+            if (!next)
+            {
+                result.Append(current[0]);
+            }
+        }
+
+        return result.ToString();
+    }
+}

Day1/Program.cs

@@ -1 +1,25 @@
-Console.WriteLine("Hello, World!");
+using Day1;
+
+var extractor = new CalibrationExtractor("./sample-input.txt");
+Console.WriteLine("Sum is:");
+Console.WriteLine(extractor.Extract().Sum());
+
+extractor = new CalibrationExtractor("./lan-input.txt");
+Console.WriteLine("LAN sum is:");
+Console.WriteLine(extractor.Extract().Sum());
+
+extractor = new CalibrationExtractor("./sample-input2.txt", new DigitTransformer());
+Console.WriteLine("Transformed sum is:");
+Console.WriteLine(extractor.Extract().Select(x =>
+{
+    Console.WriteLine(x);
+    return x;
+}).Sum());
+
+extractor = new CalibrationExtractor("./lan-input.txt", new DigitTransformer());
+Console.WriteLine("LAN transformed sum is:");
+Console.WriteLine(extractor.Extract().Select(x =>
+{
+    Console.WriteLine(x);
+    return x;
+}).Sum());

Day1/lan-input.txt

@@ -0,0 +1,1000 @@
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Day1/sample-input.txt

@@ -0,0 +1,4 @@
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Day1/sample-input2.txt

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