public object PartTwo(string input)
{
var icm = new IntCodeMachine(input);
icm.memory[0] = 2;
var score = 0;
var icolBall = -1;
var icolPaddle = -1;
var dir = 0;
while (true)
{
var output = icm.Run(dir);
var chunks = Chunk(output, 3);
foreach (var chunk in chunks)
{
var(icol, irow, block) = (chunk[0], chunk[1], chunk[2]);
if ((icol, irow) == (-1, 0))
{
score = (int)block;
}
if (block == 3)
{
icolPaddle = (int)icol;
}
else if (block == 4)
{
icolBall = (int)icol;
}
}
if (icm.Halted())
{
break;
}
dir =
icolBall <icolPaddle ? -1 :
icolBall> icolPaddle ? 1 :
0;
}
return(score);
}
