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.
This commit is contained in:
2022-12-10 09:25:07 -06:00
parent dd50a46ede
commit 8aab7076fb
5 changed files with 400 additions and 94 deletions

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@ -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" />

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@ -1,94 +1,138 @@
{{<{{{{([{[([[()<>]{<>{}}]<([]())(()<>)>)((({}())[()[]])<<[][]>[{}[]]>)]{{(<{}<>>{<><>}]([<>[]]<
[(<{{[{(<({{<<[]()><<>{}>>([<>[]]{<><>})}})>)}]}}>[{(<{({[{[[({}())((){})]({{}[]})]<<[<>{}]([][])>({<>()}
(({<{[{({(([[([]())({}())]]({[[]{}]([][]))<((){})<{}<>>>))[(([<>[]]<[]>)(([]{}){{}{}}))])})[({<[{
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[[((<({<(<{<<{{}()}{[][]}>[((){})]>}>{((<({}<>)<{}()>>[[<>()]])<<<[][]><<>[]>>{<{}[]>(<>())}>)<{[[{
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noop
noop
noop
noop
noop
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noop
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noop
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noop
noop
noop
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noop
addx 3
addx -5

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addx 15
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noop
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noop
noop
noop
noop
addx 1
noop
noop
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noop
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noop

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src/10.cs Normal file
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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}";
}
}