private static int FindCorrectMutation(Instruction[] code)
{
var visited = new HashSet <InstructionPointer>();
var gameConsole = new HandheldGameConsole(stopFunction: ip => !visited.Add(ip) ? Termination.InfiniteLoop : Termination.None);
for (var i = 0; i < code.Length; ++i)
{
if (code[i].Operation == Operation.Acc)
{
continue;
}
visited.Clear();
var originalInstruction = code[i];
code[i] = SwapInstruction(originalInstruction);
var(result, termination) = gameConsole.Run(code);
if (termination == Termination.RanToCompletion)
{
return(result);
}
code[i] = originalInstruction;
}
throw new InvalidOperationException();
}
public void Part1(string file, int expected)
{
var code = File.ReadAllLines(file).Select(ParseInstruction).ToArray();
var visited = new HashSet <InstructionPointer>();
var gameConsole = new HandheldGameConsole(stopFunction: ip => !visited.Add(ip) ? Termination.InfiniteLoop : Termination.None);
var(result, _) = gameConsole.Run(code);
Assert.Equal(expected, result);
}
