static void BruteInfiniteLoop(string[] instructions)
{
var nopToJmp = BruteInfiniteLoopNopToJmp(instructions);
if (nopToJmp is not null)
{
Console.WriteLine(StupidGameEmulator.CalculateAccUntilLoop(nopToJmp));
return;
}
var jmpToNop = BruteInfiniteLoopJmpToNop(instructions);
Console.WriteLine(StupidGameEmulator.CalculateAccUntilLoop(jmpToNop));
}
static async Task Main(string[] args)
{
//var instructions = new[] {
// "nop +0",
// "acc +1",
// "jmp +4",
// "acc +3",
// "jmp -3",
// "acc -99",
// "acc +1",
// "jmp -4",
// "acc +6",
//};
var instructions = await File.ReadAllLinesAsync("input.txt");
Console.WriteLine("Value of accumulator before loop: {0}", StupidGameEmulator.CalculateAccUntilLoop(instructions));
BruteInfiniteLoop(instructions);
}
static string[] BruteInfiniteLoopJmpToNop(string[] instructions)
{
bool found = false;
int pointer = 0;
string[] copyInstructions = null;
while (!found && (pointer < instructions.Length))
{
copyInstructions = instructions.ToArray();
if (copyInstructions[pointer].StartsWith("jmp"))
{
copyInstructions[pointer] = copyInstructions[pointer].Replace("jmp", "nop");
found = !StupidGameEmulator.ProgramHasInfiniteLoop(copyInstructions);
}
pointer++;
}
return(found ? copyInstructions : null);
}
