Solve day 2 part 1

AdventOfCode/Day01.cs

@@ -15,7 +15,7 @@ public override ValueTask<string> Solve_1()
     {
         return new ValueTask<string>(
             _input
-                .Select(line => CalculateCalibrationValue(line,  @"(\d)"))
+                .Select(line => CalculateCalibrationValue(line, @"(\d)"))
                 .Sum()
                 .ToString()
         );
@@ -25,33 +25,35 @@ public override ValueTask<string> Solve_2()
     {
         return new ValueTask<string>(
             _input
-                .Select(line =>CalculateCalibrationValue(line,  @"(\d)|((one)|(two)|(three)|(four)|(five)|(six)|(seven)|(eight)|(nine))"))
+                .Select(line => CalculateCalibrationValue(line,
+                    @"(\d)|((one)|(two)|(three)|(four)|(five)|(six)|(seven)|(eight)|(nine))"))
                 .Sum()
                 .ToString());
     }
 
     private static int CalculateCalibrationValue(string line, string pattern)
     {
-        if (line.Length == 0)
-        {
-            return 0;
-        }
+        if (line.Length == 0) return 0;
 
         var firstDigit = SpelledDigitToInt(Regex.Match(line, pattern).Value);
         var lastDigit = SpelledDigitToInt(Regex.Match(line, pattern, RegexOptions.RightToLeft).Value);
         return int.Parse($"{firstDigit}{lastDigit}");
     }
 
-    private static int SpelledDigitToInt(string digit) => digit switch {
-        "one" => 1,
-        "two" => 2,
-        "three" => 3,
-        "four" => 4,
-        "five" => 5,
-        "six" => 6,
-        "seven" => 7,
-        "eight" => 8,
-        "nine" => 9,
-        _ => int.Parse(digit)
-    };
+    private static int SpelledDigitToInt(string digit)
+    {
+        return digit switch
+        {
+            "one" => 1,
+            "two" => 2,
+            "three" => 3,
+            "four" => 4,
+            "five" => 5,
+            "six" => 6,
+            "seven" => 7,
+            "eight" => 8,
+            "nine" => 9,
+            _ => int.Parse(digit)
+        };
+    }
 }

AdventOfCode/Day02.cs

@@ -0,0 +1,82 @@
+using System.Text.RegularExpressions;
+
+namespace AdventOfCode;
+
+public sealed class Day02 : BaseDay
+{
+    private readonly List<Game> _input;
+
+    public Day02()
+    {
+        var lines = File.ReadAllLines(InputFilePath);
+
+        _input = lines.Select(ParseGame).ToList();
+    }
+
+    public override ValueTask<string> Solve_1()
+    {
+        return new ValueTask<string>(
+            _input
+                .Where(game => game.IsPossible())
+                .Select(game => game.Id)
+                .Sum().ToString()
+        );
+    }
+
+    public override ValueTask<string> Solve_2()
+    {
+        return new ValueTask<string>("Not implemented.");
+    }
+
+    public Game ParseGame(string line)
+    {
+        var separatedBySemicolon = line.Split(":");
+        var gameId = separatedBySemicolon[0].Split(" ")[1];
+
+        var subsetStrings = separatedBySemicolon[1].Split(";");
+        var subsets = subsetStrings.Select(ParseSubset).ToList();
+        return new Game(int.Parse(gameId), subsets);
+    }
+
+    public Subset ParseSubset(string line)
+    {
+        var numberOfBlue = ParseColor(line, "blue");
+        var numberOfRed = ParseColor(line, "red");
+        var numberOfGreen = ParseColor(line, "green");
+
+        return new Subset(numberOfBlue, numberOfRed, numberOfGreen);
+    }
+
+    private static int ParseColor(string line, string color)
+    {
+        var match = Regex.Match(line, $@"(\d+) {color}").Value;
+        var number = match.Split(" ")[0];
+
+        return number.Length == 0 ? 0 : int.Parse(number);
+    }
+}
+
+public class Game()
+{
+    private const int BlueLimit = 14;
+    private const int GreenLimit = 13;
+    private const int RedLimit = 12;
+
+    public Game(int id, IEnumerable<Subset> subsets) : this()
+    {
+        Id = id;
+        Subsets = subsets;
+    }
+
+    public int Id { get; }
+    public IEnumerable<Subset> Subsets { get; }
+
+    public bool IsPossible()
+    {
+        return Subsets.All(subset => subset.NumberOfBlue <= BlueLimit
+                                     && subset.NumberOfRed <= RedLimit
+                                     && subset.NumberOfGreen <= GreenLimit);
+    }
+}
+
+public record Subset(int NumberOfBlue, int NumberOfRed, int NumberOfGreen);

AdventOfCode/Inputs/02.txt

@@ -0,0 +1,100 @@
+Game 1: 1 red, 10 blue, 5 green; 11 blue, 6 green; 6 green; 1 green, 1 red, 12 blue; 3 blue; 3 blue, 4 green, 1 red
+Game 2: 3 red, 5 green; 5 green, 7 red; 1 blue, 7 red, 3 green; 3 red, 2 blue; 5 green, 4 red
+Game 3: 4 blue, 4 green; 2 green, 2 blue; 8 green, 2 red, 3 blue
+Game 4: 3 blue, 15 green; 16 green; 2 red, 7 green; 2 blue, 14 green
+Game 5: 8 green, 6 red, 16 blue; 8 red, 12 green; 1 red, 9 green, 16 blue; 8 red, 3 green; 2 blue, 5 red, 10 green; 15 red, 4 blue, 8 green
+Game 6: 5 blue, 2 green; 6 red, 3 green; 4 green, 4 blue, 2 red; 14 blue, 2 red
+Game 7: 2 green, 6 blue, 1 red; 2 blue, 1 red; 8 blue; 5 blue, 1 green; 6 blue, 1 red; 2 blue
+Game 8: 1 red, 10 blue, 1 green; 6 blue, 1 red; 3 blue, 2 green; 1 red, 1 blue, 3 green; 13 blue; 10 blue, 3 green, 3 red
+Game 9: 2 blue; 8 green, 3 blue; 4 green; 14 green, 1 red, 2 blue; 3 blue, 1 red, 12 green
+Game 10: 1 blue, 7 green; 1 red, 3 green, 5 blue; 1 blue, 5 green, 1 red; 13 green, 5 blue, 2 red
+Game 11: 1 green, 10 red, 6 blue; 15 red, 12 blue; 18 red, 1 green, 1 blue
+Game 12: 16 red, 8 blue, 1 green; 15 red, 3 blue, 1 green; 5 red
+Game 13: 6 red, 7 blue, 7 green; 3 blue, 4 red, 13 green; 1 blue, 6 red, 11 green; 2 red, 1 blue, 14 green; 8 green, 5 blue, 2 red; 4 blue, 18 green, 4 red
+Game 14: 16 red, 3 blue, 1 green; 7 green, 3 red; 16 red, 15 green, 3 blue; 3 blue, 13 red, 10 green
+Game 15: 1 blue, 1 red; 3 blue, 2 green; 1 red; 2 red, 2 green, 3 blue; 3 blue, 1 red, 3 green
+Game 16: 9 red, 3 blue; 13 red, 9 blue; 9 blue, 10 red; 5 red, 10 blue, 1 green; 2 red, 6 green, 8 blue; 6 green, 13 red, 5 blue
+Game 17: 15 red, 17 green, 8 blue; 18 red, 16 blue, 15 green; 8 blue, 17 green, 10 red; 5 green, 3 red, 12 blue
+Game 18: 2 blue, 11 red, 2 green; 1 green, 11 red, 11 blue; 1 red, 4 blue; 10 blue, 9 red; 1 blue, 7 red
+Game 19: 2 blue, 3 green, 5 red; 8 blue, 16 green; 12 red, 7 blue, 8 green; 9 green, 1 blue; 3 red, 16 green, 10 blue
+Game 20: 3 blue, 5 green, 6 red; 2 red, 8 blue, 7 green; 7 green, 3 blue; 2 red, 11 blue; 1 green, 6 red, 3 blue
+Game 21: 16 red, 3 blue, 8 green; 10 red, 15 blue, 3 green; 6 green, 13 red, 15 blue; 11 green, 13 blue, 10 red
+Game 22: 8 green, 1 blue; 2 blue, 9 green, 3 red; 2 red, 2 blue; 1 red, 3 blue, 8 green; 2 blue, 1 green; 1 green, 2 blue
+Game 23: 2 blue, 8 red, 5 green; 9 green, 2 blue; 10 red, 2 green; 12 red, 1 blue; 11 green, 2 blue, 13 red; 7 green
+Game 24: 6 red; 13 green, 7 red, 10 blue; 7 green, 9 red, 1 blue; 3 blue, 2 green, 2 red
+Game 25: 7 green, 1 red, 2 blue; 8 green, 2 blue, 5 red; 5 blue, 8 green, 4 red; 5 blue, 2 green, 1 red; 5 green, 3 red, 7 blue; 3 blue, 6 green, 1 red
+Game 26: 6 green, 3 red; 1 blue, 2 green, 2 red; 2 green, 2 red, 3 blue; 4 blue, 8 red, 2 green; 1 red, 1 green, 1 blue; 6 red, 5 blue
+Game 27: 4 green, 13 blue, 2 red; 2 red, 7 green, 10 blue; 14 blue, 11 green, 1 red; 10 blue, 15 green
+Game 28: 4 green, 13 red, 7 blue; 2 red, 5 blue; 5 blue, 4 green
+Game 29: 6 green, 15 red; 1 blue, 6 red, 8 green; 6 green, 1 blue; 12 red; 1 green, 7 red, 1 blue
+Game 30: 4 blue, 4 green, 2 red; 6 blue, 9 red, 20 green; 9 blue, 4 red, 2 green; 8 red, 8 blue, 1 green; 6 green, 12 blue, 2 red; 8 green, 8 red
+Game 31: 9 blue; 1 red, 2 blue, 5 green; 2 blue, 2 red, 9 green; 2 blue, 1 red, 8 green; 11 green, 2 red, 3 blue; 7 green, 5 blue
+Game 32: 15 red, 5 green; 4 green, 2 blue, 3 red; 1 blue, 9 red; 1 blue, 15 red; 4 blue, 2 red, 8 green; 3 green, 3 blue
+Game 33: 13 blue, 1 red, 1 green; 8 blue, 6 red; 4 blue, 2 red
+Game 34: 5 blue, 9 red, 7 green; 8 red, 6 green, 5 blue; 2 blue, 7 green, 12 red
+Game 35: 4 blue, 15 red; 1 green, 10 blue, 7 red; 9 red, 3 green, 1 blue; 13 red, 9 blue; 3 blue, 2 red
+Game 36: 4 blue, 18 green, 2 red; 5 green, 6 blue, 11 red; 6 red, 12 blue, 14 green; 19 green, 10 blue, 7 red; 7 red, 8 green, 9 blue
+Game 37: 16 blue, 5 green, 18 red; 3 blue, 14 green, 1 red; 4 blue, 3 green, 14 red; 12 green, 7 red, 15 blue; 15 green, 11 blue, 2 red; 8 blue, 13 green, 6 red
+Game 38: 6 red, 4 blue, 12 green; 3 red, 11 blue; 16 green, 2 blue, 8 red; 4 blue, 11 red, 4 green; 17 green, 7 red, 10 blue; 9 blue, 15 green, 1 red
+Game 39: 1 green, 1 red, 10 blue; 1 red, 5 blue, 2 green; 4 red, 7 blue; 9 red, 6 green, 5 blue; 1 green, 2 blue, 9 red
+Game 40: 13 blue, 11 red, 12 green; 8 green, 11 red, 4 blue; 2 blue, 2 green, 12 red; 2 green, 3 red, 13 blue; 13 blue, 6 red, 2 green; 4 green, 6 red, 8 blue
+Game 41: 12 red, 4 green, 13 blue; 4 red, 7 blue, 10 green; 17 green, 17 red, 11 blue
+Game 42: 1 red, 1 green; 1 red, 4 green; 1 blue, 4 red, 4 green; 3 red; 1 blue, 3 green, 1 red
+Game 43: 7 blue, 10 green; 5 blue, 2 green; 2 blue, 1 green, 4 red; 14 red, 6 green, 7 blue; 4 green, 14 red, 8 blue; 4 green, 6 red
+Game 44: 9 green, 4 red; 4 red, 6 green; 5 red, 2 blue, 7 green; 9 blue, 1 green, 14 red
+Game 45: 20 blue, 4 red, 6 green; 3 blue, 1 green, 6 red; 8 blue, 8 green, 11 red
+Game 46: 1 green, 6 red; 6 red, 3 blue, 3 green; 6 red, 3 blue, 4 green; 1 blue, 5 red; 1 green, 4 red, 1 blue; 2 green, 4 red
+Game 47: 12 green, 8 red, 4 blue; 7 green, 6 red, 11 blue; 4 red, 11 blue, 12 green
+Game 48: 1 green, 3 blue; 13 green, 3 red, 11 blue; 7 blue, 1 green, 2 red; 7 red, 15 green, 4 blue; 4 red, 8 blue, 10 green; 15 green, 8 blue, 6 red
+Game 49: 2 red; 2 red, 9 blue; 4 blue, 1 green
+Game 50: 10 blue, 1 green, 18 red; 13 red, 1 green, 7 blue; 4 red, 2 green, 9 blue; 2 green, 4 red, 10 blue; 7 blue, 3 red; 19 red, 9 blue
+Game 51: 2 green, 2 red, 5 blue; 9 red, 5 blue; 3 red, 10 blue; 9 blue, 6 red, 7 green; 2 red, 5 blue
+Game 52: 6 blue, 3 green; 5 green, 3 blue, 5 red; 1 blue, 2 green, 2 red
+Game 53: 2 blue, 9 green, 15 red; 18 red, 1 blue; 13 red, 12 green; 7 green, 2 blue, 9 red
+Game 54: 18 green; 2 red, 6 green; 6 red, 9 green, 1 blue; 1 blue, 4 green, 5 red; 3 red; 3 green, 4 red
+Game 55: 5 red, 2 blue, 5 green; 10 blue, 4 green, 8 red; 15 green, 9 blue, 9 red; 1 green, 9 blue
+Game 56: 8 green, 11 blue, 1 red; 1 blue, 1 red, 4 green; 8 blue
+Game 57: 5 green, 4 blue; 1 blue, 4 green; 1 red, 1 green, 3 blue; 1 red, 2 blue, 6 green
+Game 58: 8 green, 10 red, 10 blue; 8 blue, 6 green, 12 red; 9 green, 11 blue, 1 red; 12 red, 5 green, 11 blue; 7 red, 2 green, 8 blue
+Game 59: 10 red, 1 green, 3 blue; 16 red, 1 green, 4 blue; 9 red, 2 blue; 1 red
+Game 60: 11 blue, 13 green, 10 red; 15 red, 12 blue; 3 blue, 9 green, 6 red; 12 blue, 5 green
+Game 61: 2 blue, 7 red; 3 green, 14 blue, 11 red; 7 red, 10 blue; 6 blue, 3 green, 4 red; 10 blue
+Game 62: 1 blue, 7 green; 6 red, 12 green, 1 blue; 8 red
+Game 63: 1 blue, 3 green, 1 red; 8 green, 10 red, 1 blue; 8 green, 11 red; 1 blue, 11 green, 5 red; 8 green, 11 red, 2 blue; 2 blue, 10 red, 6 green
+Game 64: 17 green, 2 blue; 12 blue, 8 green; 11 green, 3 red, 4 blue; 5 red, 9 green, 14 blue
+Game 65: 7 blue, 12 green, 5 red; 13 green, 5 blue, 4 red; 4 blue, 8 green, 1 red; 5 red, 10 green, 10 blue; 5 red, 5 blue, 15 green; 4 red, 9 green, 10 blue
+Game 66: 8 green, 2 red; 8 red, 4 green; 5 red, 2 blue, 7 green
+Game 67: 10 green, 7 blue, 2 red; 15 blue, 1 green, 9 red; 2 red, 7 green, 18 blue; 3 green, 5 blue, 8 red; 10 green, 11 blue, 1 red; 10 green, 4 red, 17 blue
+Game 68: 13 green, 10 blue, 7 red; 1 red, 15 green, 7 blue; 17 green, 14 red, 3 blue; 6 green, 8 blue, 6 red; 4 red, 3 blue, 5 green
+Game 69: 1 red, 6 green, 3 blue; 3 red, 4 blue, 6 green; 2 blue, 2 red, 1 green; 6 blue, 9 green, 2 red; 5 green, 6 blue
+Game 70: 1 green, 1 red, 3 blue; 2 green, 4 blue, 8 red; 5 red, 2 green, 3 blue; 3 green, 1 red, 3 blue; 3 green, 4 blue
+Game 71: 11 blue, 13 green; 1 red, 11 green, 3 blue; 6 blue, 14 green, 1 red; 5 blue, 17 green
+Game 72: 3 blue, 10 green, 4 red; 2 green, 6 red, 13 blue; 1 green, 1 blue, 6 red; 5 red, 1 blue, 1 green; 2 green, 5 red, 5 blue; 9 blue, 10 green, 6 red
+Game 73: 6 red, 4 green, 1 blue; 1 blue, 5 red, 3 green; 2 red, 11 green, 3 blue
+Game 74: 13 green, 2 red, 2 blue; 5 blue, 6 green; 12 green, 3 red, 4 blue; 2 green
+Game 75: 9 red, 10 blue, 6 green; 12 blue, 9 red; 11 red, 6 green; 12 blue, 2 red, 1 green
+Game 76: 1 green, 2 blue, 5 red; 2 blue, 1 green; 1 blue, 2 green, 1 red; 2 blue, 1 red; 3 green, 3 red
+Game 77: 5 green, 12 blue, 3 red; 11 blue, 9 green, 13 red; 8 blue, 13 green, 13 red
+Game 78: 2 red, 3 blue, 1 green; 1 green, 19 blue, 1 red; 7 blue, 2 green, 2 red
+Game 79: 5 red, 1 blue, 4 green; 1 blue, 9 green, 10 red; 13 red, 1 green; 1 blue, 1 red, 5 green
+Game 80: 13 green, 2 blue; 1 red, 4 blue, 13 green; 5 red, 7 green, 4 blue
+Game 81: 3 red, 4 blue, 12 green; 16 green, 5 red, 1 blue; 4 blue, 2 red, 2 green; 4 blue, 5 red, 13 green; 8 red, 4 blue, 13 green; 16 green, 3 red
+Game 82: 6 red, 3 green, 2 blue; 1 green, 6 red, 2 blue; 3 blue, 8 green, 9 red
+Game 83: 3 green, 3 red, 1 blue; 3 blue, 4 green, 3 red; 3 blue, 4 green, 1 red; 2 red, 8 green, 2 blue
+Game 84: 5 red, 6 blue, 3 green; 1 blue, 2 green; 3 green, 2 blue, 2 red; 1 red, 3 green, 6 blue; 12 red, 2 green; 4 blue, 2 green, 4 red
+Game 85: 11 green, 4 blue, 9 red; 13 red, 1 blue, 11 green; 7 green, 8 blue, 7 red; 1 red, 4 blue
+Game 86: 3 blue, 19 green, 7 red; 19 green, 1 red, 1 blue; 9 green, 2 red; 7 red, 6 green, 1 blue
+Game 87: 1 blue, 1 green, 4 red; 1 green, 6 red; 6 red, 2 blue; 8 red, 3 blue
+Game 88: 9 red, 6 blue; 4 red, 1 blue, 2 green; 1 green, 10 blue, 6 red; 2 blue, 1 green, 10 red; 7 red, 9 blue
+Game 89: 3 blue, 15 green, 1 red; 1 red, 13 green, 3 blue; 4 blue, 14 green, 4 red; 10 green, 1 blue
+Game 90: 1 red, 13 green; 3 green, 1 red, 5 blue; 5 blue, 6 green; 14 green, 4 blue; 3 blue, 10 green; 13 green, 1 red
+Game 91: 13 green, 11 red, 4 blue; 14 red, 1 green, 10 blue; 4 red, 2 green, 3 blue
+Game 92: 2 red, 3 blue, 6 green; 2 red, 2 blue, 8 green; 14 blue, 1 red, 1 green
+Game 93: 15 blue, 2 red, 13 green; 8 green, 2 red, 8 blue; 6 blue, 1 red, 2 green
+Game 94: 5 red, 4 green, 9 blue; 1 red, 5 green, 4 blue; 11 blue, 4 green, 2 red
+Game 95: 9 blue, 3 green; 2 green, 12 blue; 10 green, 3 blue; 1 green, 1 red, 10 blue
+Game 96: 4 blue, 2 red; 3 green, 10 blue, 7 red; 2 blue, 7 green, 1 red; 13 blue, 9 green; 10 blue, 4 green, 1 red
+Game 97: 6 red, 4 green; 1 blue, 13 red; 3 green, 13 red
+Game 98: 1 red, 13 blue, 1 green; 7 green, 5 blue, 3 red; 15 blue, 6 green; 4 blue, 5 green; 13 blue, 2 green, 1 red; 4 blue, 3 red, 2 green
+Game 99: 1 red, 2 green; 2 red, 2 blue, 1 green; 3 green, 1 blue, 6 red; 3 red, 4 green; 5 red, 1 blue, 4 green; 1 blue, 2 red, 1 green
+Game 100: 9 green, 2 blue, 12 red; 2 blue, 14 red, 2 green; 14 red, 12 green

AdventOfCodeTests/AdventOfCodeTests.csproj

@@ -23,4 +23,8 @@
         </PackageReference>
     </ItemGroup>
 
+    <ItemGroup>
+        <ProjectReference Include="..\AdventOfCode\AdventOfCode.csproj"/>
+    </ItemGroup>
+
 </Project>

AdventOfCodeTests/Day02.cs

@@ -1,9 +1,54 @@
+using AdventOfCode;
+
 namespace TestProject1;
 
-public class Day02
+public class Day02Test
 {
     [Fact]
-    public void Test1()
+    public void IdentifiesPossibleGames()
+    {
+        const string input = """
+                             Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+                             Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+                             Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
+                             """;
+
+        var game = new Day02().ParseGame(input);
+
+        Assert.True(game.IsPossible());
+    }
+
+    [Fact]
+    public void IdentifiesImpossibleGames()
     {
+        const string input = """
+                             Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+                             Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+                             """;
+
+        var game = new Day02().ParseGame(input);
+
+        Assert.False(game.IsPossible());
+    }
+
+    [Fact]
+    public void CorrectlyParsesGames()
+    {
+        const string line = "Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red";
+        var game = new Day02().ParseGame(line);
+
+        Assert.Equal(3, game.Id);
+        Assert.Equal(3, game.Subsets.Count());
+    }
+
+    [Fact]
+    public void CorrectlyParsesSubsets()
+    {
+        const string line = "8 green, 6 blue, 20 red";
+        var subset = new Day02().ParseSubset(line);
+
+        Assert.Equal(8, subset.NumberOfGreen);
+        Assert.Equal(6, subset.NumberOfBlue);
+        Assert.Equal(20, subset.NumberOfRed);
     }
 }