//######################################################################
// Part 1 + 2 Solutions
//######################################################################
public static int Part1()
{
const string path = Helpers.inputPath + @"\day08\input.txt";
IProgram input = ProcessInputFile(path);
int programLength = input.Accept(new TotalLength());
Run v = new Run(programLength);
input.Accept(v);
return(v.Accumulator);
}
public static int Part2()
{
// TODO: make this more visitor-ey
const string path = Helpers.inputPath + @"\day08\input.txt";
IProgram input = ProcessInputFile(path);
int programLength = input.Accept(new TotalLength());
IList <(string, int)> instructions = Helpers.ProcessInputFile(path, StringToInstruction);
for (int i = 0; i < instructions.Count; i++)
{
IList <IProgram> newInstructions = instructions.Select((inst, j) =>
{
switch (inst.Item1)
{
case "acc": return(IProgram.MakeACC(inst.Item2));
case "nop":
{
if (i == j)
{
return(IProgram.MakeJMP(inst.Item2));
}
else
{
return(IProgram.MakeNOP(inst.Item2));
}
}
case "jmp":
{
if (i == j)
{
return(IProgram.MakeNOP(inst.Item2));
}
else
{
return(IProgram.MakeJMP(inst.Item2));
}
}
default: throw new ArgumentException("Invalid opcode.");
}
}).ToList();
IProgram sequence = IProgram.MakeSequence(newInstructions);
Run rv = new Run(programLength);
if (sequence.Accept(rv))
{
Console.WriteLine("Index changed: " + i);
return(rv.Accumulator);
}
}
throw new Exception("Value not found");
}
IList <Run> IProgram.IVisitor <IList <Run> > .Visit(JMP jmp)
{
IList <Run> terminated = new List <Run>();
Run jmpRun = new Run(1);
if (jmp.Accept(jmpRun))
{
terminated.Add(jmpRun);
}
IProgram nop = IProgram.MakeNOP(jmp.Argument);
Run nopRun = new Run(1);
if (nop.Accept(nopRun))
{
terminated.Add(nopRun);
}
return(terminated);
}
public ReplaceAndRun(IProgram program)
{
sourceProgram = program.Accept(new Flatten());
sourceLength = program.Accept(new TotalLength());
}