public string SolveB()
{
var lines = File.ReadAllLines(Input, Encoding.UTF8);
var program = Intcode.ParseInput(lines[0]);
var computerBank = new Computer[50];
const int numComputers = 50;
var nat = new Nat();
long lastY = -666;
long?answer = null;
Action <PacketToSend> packetSender = (PacketToSend packet) =>
{
if (packet.Destination == 255)
{
nat.Receive(packet.ToSend);
// Is anything processing?
bool idle = computerBank.All(c => c.Idle);
if (idle)
{
if (lastY == nat.current.Y)
{
answer = lastY;
}
else
{
lastY = nat.current.Y;
}
computerBank[0].QueuePacket(nat.current);
}
}
else
{
computerBank[packet.Destination].QueuePacket(packet.ToSend);
}
};
for (int i = 0; i < numComputers; i++)
{
computerBank[i] = new Computer(i, program, packetSender);
}
while (!answer.HasValue)
{
foreach (var computer in computerBank)
{
computer.Step();
}
}
return(answer.Value.ToString());
}
