public string Solve(string input)
{
Instruction[] data = input
.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries)
.Select(x => new Instruction(x))
.ToArray();
var state = new ConsoleState
{
Accumulator = 0,
Pointer = 0,
Instructions = data,
ExecutedInstructions = new List <int>(),
};
// We know that the current state is wrong, so we won't bother executing it. We'll simply loop through
// all the instructions, and every time we find a jmp or a nop, we'll execute a variant of the instructions
// with that instruction changed.
for (int pointer = 0; pointer < state.Instructions.Length; pointer++)
{
string?newInstruction = null;
if (state.Instructions[pointer].Name == "jmp")
{
newInstruction = "nop";
}
else if (state.Instructions[pointer].Name == "nop")
{
newInstruction = "jmp";
}
if (newInstruction != null)
{
ConsoleState copiedState = state.Clone();
copiedState.Instructions[pointer] = new Instruction(newInstruction, copiedState.Instructions[pointer].Parameter);
if (copiedState.RunToEnd())
{
return(copiedState.Accumulator.ToString());
}
}
}
return(string.Empty);
}
public string Solve(string input)
{
Instruction[] data = input
.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries)
.Select(x => new Instruction(x))
.ToArray();
var state = new ConsoleState
{
Accumulator = 0,
Pointer = 0,
Instructions = data,
ExecutedInstructions = new List <int>(),
};
state.RunToEnd();
return(state.Accumulator.ToString());
}