protected override string SolvePartTwo()
{
// For each instruction to replace, we will re-run this computer again and again
foreach (var kvp in instructions)
{
// Reinitialize from the beginning
computer = new GameComputer(Input);
// Change this one instruction (must be done indirectly since I'm not using a class)
var current = computer.instructions[kvp.Key];
current.instruction = (kvp.Value == GameComputerOps.jmp ? "nop" : "jmp");
computer.instructions[kvp.Key] = current;
// Go through each step
int ret = computer.DoOperation();
while (ret == 1)
{
ret = computer.DoOperation();
}
// Check if we exited normally
if (ret == 2)
{
break;
}
// Otherwise, loop again and try over
}
return(computer.accumulator.ToString());
}
public Day08() : base(08, 2020, "")
{
// Load the original computer
computer = new GameComputer(Input);
// Let's note all of the positions of jmp and nop
instructions = new Dictionary <int, GameComputerOps>();
for (int i = 0; i < computer.instructions.Count; i++)
{
var name = computer.ParseInstructionName(computer.instructions[i].instruction);
// Skip acc instructions for Part 2
if (name == GameComputerOps.acc)
{
continue;
}
// Note the position and instruction we have (to possibly replace)
instructions.Add(i, name);
}
}