Day 2 solution

This is an ugly, kind-of-brute-force solution. I'm not proud of it, but it works and got me top 1000 on both parts.

I also changed the "which day to run if no day is specified" to just always choose the highest numbered day.

advent-of-code-2022.csproj

@@ -73,6 +73,8 @@
 	  <EmbeddedResource Include="inputs\24.txt" />
 	  <None Remove="inputs\25.txt" />
 	  <EmbeddedResource Include="inputs\25.txt" />
+	  <None Remove="inputs\02a.txt" />
+	  <EmbeddedResource Include="inputs\02a.txt" />
 	</ItemGroup>
 
 </Project>

inputs/02a.txt

@@ -0,0 +1,3 @@
+A Y
+B X
+C Z

src/02.cs

@@ -0,0 +1,115 @@
+namespace aoc2022;
+
+internal class Day02 : Day
+{
+    IEnumerable<string>? lines;
+
+    internal override void Parse()
+    {
+        lines = Util.ReadAllLines("02");
+    }
+
+    internal override string Part1()
+    {
+        int score = 0;
+        foreach (var line in lines!)
+        {
+            int roundScore = 0;
+            switch (line[0])
+            {
+                case 'A' when line[2] == 'X':
+                    roundScore += 1;
+                    roundScore += 3;
+                    break;
+                case 'A' when line[2] == 'Y':
+                    roundScore += 2;
+                    roundScore += 6;
+                    break;
+                case 'A' when line[2] == 'Z':
+                    roundScore += 3;
+                    roundScore += 0;
+                    break;
+                case 'B' when line[2] == 'X':
+                    roundScore += 1;
+                    roundScore += 0;
+                    break;
+                case 'B' when line[2] == 'Y':
+                    roundScore += 2;
+                    roundScore += 3;
+                    break;
+                case 'B' when line[2] == 'Z':
+                    roundScore += 3;
+                    roundScore += 6;
+                    break;
+                case 'C' when line[2] == 'X':
+                    roundScore += 1;
+                    roundScore += 6;
+                    break;
+                case 'C' when line[2] == 'Y':
+                    roundScore += 2;
+                    roundScore += 0;
+                    break;
+                case 'C' when line[2] == 'Z':
+                    roundScore += 3;
+                    roundScore += 3;
+                    break;
+            }
+
+            score += roundScore;
+        }
+
+        return $"Score: <+white>{score}";
+    }
+
+    internal override string Part2()
+    {
+        int score = 0;
+        foreach (var line in lines!)
+        {
+            int roundScore = 0;
+            switch (line[0])
+            {
+                case 'A' when line[2] == 'X':
+                    roundScore += 3;
+                    roundScore += 0;
+                    break;
+                case 'A' when line[2] == 'Y':
+                    roundScore += 1;
+                    roundScore += 3;
+                    break;
+                case 'A' when line[2] == 'Z':
+                    roundScore += 2;
+                    roundScore += 6;
+                    break;
+                case 'B' when line[2] == 'X':
+                    roundScore += 1;
+                    roundScore += 0;
+                    break;
+                case 'B' when line[2] == 'Y':
+                    roundScore += 2;
+                    roundScore += 3;
+                    break;
+                case 'B' when line[2] == 'Z':
+                    roundScore += 3;
+                    roundScore += 6;
+                    break;
+                case 'C' when line[2] == 'X':
+                    roundScore += 2;
+                    roundScore += 0;
+                    break;
+                case 'C' when line[2] == 'Y':
+                    roundScore += 3;
+                    roundScore += 3;
+                    break;
+                case 'C' when line[2] == 'Z':
+                    roundScore += 1;
+                    roundScore += 6;
+                    break;
+            }
+
+            score += roundScore;
+        }
+
+        return $"Score: <+white>{score}";
+    }
+}

src/main.cs

@@ -49,7 +49,7 @@ else
     Day? day = null;
     if (string.IsNullOrEmpty(desiredDay))
     {
-        day = new Day01();
+        day = (Day)Activator.CreateInstance(types.Last())!;
     }
     else
     {