Day 10 solution

Pretty happy with this solution. Took me longer to read and understand part 2 than I would have liked, but it's done, and pretty cleanly, too.

advent-of-code-2022.csproj

@@ -50,6 +50,8 @@
 	  <EmbeddedResource Include="inputs\09b.txt" />
 	  <EmbeddedResource Include="inputs\10.txt" />
 	  <None Remove="inputs\11.txt" />
+	  <EmbeddedResource Include="inputs\10a.txt" />
+	  <EmbeddedResource Include="inputs\10b.txt" />
 	  <EmbeddedResource Include="inputs\11.txt" />
 	  <None Remove="inputs\12.txt" />
 	  <EmbeddedResource Include="inputs\12.txt" />

inputs/10.txt

@@ -1,94 +1,138 @@
-{{<{{{{([{[([[()<>]{<>{}}]<([]())(()<>)>)((({}())[()[]])<<[][]>[{}[]]>)]{{(<{}<>>{<><>}]([<>[]]<
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-[(<{{[{(<({{<<[]()><<>{}>>([<>[]]{<><>})}})>)}]}}>[{(<{({[{[[({}())((){})]({{}[]})]<<[<>{}]([][])>({<>()}
+noop
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+addx 2
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+noop
-[[((<({<(<{<<{{}()}{[][]}>[((){})]>}>{((<({}<>)<{}()>>[[<>()]])<<<[][]><<>[]>>{<{}[]>(<>())}>)<{[[{
+addx 3
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-{<{<{{(<[[{[[({}[])[()[]]]([()<>][{}[]])]<<({}())[{}{}]><[<>[]](<><>)>>}(([([]{})((){})]((<>)([]{}))))]<{<<<
+addx 1
-<{(<<(<[<{<[{[<>[]][{}{}]}{{()<>}{<><>}>]>[<(([]{})[[]])>]}<[<([{}{}][<><>]){([]{})}>]({<{<>()}>{
+noop
-{[[<{{{<<<[<((()<>)({}{}))<{{}()}>>]<((([]{}){{}<>})[{{}<>}([]{})])({{()[]}[[]()]}[{{}()}({
+noop
-<[[[{{([{[({[<{}[]>[{}()]]{<()>}}({<()()>}<<<>()>{[]}>))]((({({}[])>{[(){}]{<><>}})(({()[]}[()<>]
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-[([([([<[{{<[[{}[]]{<>{}}][<{}>(()[])]>[({<>()}(()[])){<[][]>{()[]}}]}}<{(({()}([]()))(([]())<()[]>))<((<>{}
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+addx 19
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+noop
-{([[<<[[<[[[<[{}[]]{[]<>}>[<{}()>{<>[]}]]]<[<{[][]}(<>[])>[[{}[]]<[][]>]][((()[])[<>{}]){{{}()}[(){}]}]>]>
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+addx 3
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inputs/10a.txt

@@ -0,0 +1,3 @@
+noop
+addx 3
+addx -5

inputs/10b.txt

@@ -0,0 +1,146 @@
+addx 15
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+addx 13
+addx 4
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src/10.cs

@@ -0,0 +1,111 @@
+using System.Text;
+
+namespace aoc2022;
+
+internal class Day10 : Day
+{
+    private record instruction(int mode, int? val);
+
+    private readonly List<instruction> instructions = new();
+
+    internal override void Parse()
+    {
+        foreach (var line in Util.Parsing.ReadAllLines("10"))
+        {
+            var vals = line.Split(' ');
+            instructions.Add(new instruction(
+                vals[0] == "noop" ? 0 : 1,
+                vals.Length > 1 ? int.Parse(vals[1]) : null
+            ));
+        }
+    }
+
+    private static void run(IList<instruction> instructions, Action<int, int> duringCallback)
+    {
+        int instructionPtr = 0;
+        int register = 1;
+        int? cyclesUntilAdvance = null;
+        for (int cycle = 1; instructionPtr < instructions.Count; cycle++)
+        {
+            // during
+            var inst = instructions[instructionPtr];
+            switch (inst.mode)
+            {
+                case 0:
+                    instructionPtr++;
+                    break;
+
+                case 1:
+                    if (cyclesUntilAdvance.HasValue)
+                    {
+                        cyclesUntilAdvance--;
+                        if (cyclesUntilAdvance == 0)
+                        {
+                            instructionPtr++;
+                            cyclesUntilAdvance = null;
+                        }
+                    }
+                    else
+                    {
+                        cyclesUntilAdvance = 1;
+                    }
+                    break;
+
+                default:
+                    throw new Exception();
+            }
+
+            duringCallback(cycle, register);
+
+            // after
+            if (cyclesUntilAdvance == null && inst.val.HasValue)
+            {
+                register += inst.val.Value;
+            }
+        }
+    }
+
+    internal override string Part1()
+    {
+        List<(int cycle, int signal)> signals = new();
+        var importantCycles = new int[] {20, 60, 100, 140, 180, 220};
+        run(instructions, (int cycle, int register) =>
+        {
+            if (importantCycles.Contains(cycle))
+            {
+                int signal = cycle * register;
+                signals.Add((cycle, signal));
+            }
+        });
+
+        return $"Sum of important cycle values: <+white>{signals.Sum(x => x.signal)}";
+    }
+
+    internal override string Part2()
+    {
+        var bitmap = new bool[6, 40];
+        run(
+            instructions,
+            (cycle, register) =>
+            {
+                int row = (int)Math.Floor((cycle - 1) / (double)bitmap.GetLength(1));
+                int col = (cycle - 1) % bitmap.GetLength(1);
+                bitmap[row, col] = Math.Abs(register - col) < 2;
+            }
+        );
+
+        StringBuilder sb = new();
+        sb.Append(Environment.NewLine);
+        for (int row = 0; row < bitmap.GetLength(0); row++)
+        {
+            for (int col = 0; col < bitmap.GetLength(1); col++)
+            {
+                sb.Append(bitmap[row, col] ? "█" : " ");
+            }
+
+            sb.Append(Environment.NewLine);
+        }
+
+        return $"CRT display after instructions: <+white>{sb}";
+    }
+}