public string Part2()
{
var vm = new Vm(_instructions);
vm.MemSet(0, 2);
// Start the field
vm.Run();
var partitions = vm.Output.Partition(3);
var tiles = new Dictionary <(BigInteger, BigInteger), BigInteger>();
var score = 0;
foreach (var p in partitions)
{
var key = (p[0], p[1]);
var val = p[2];
if (key == (-1, 0))
{
score = int.Parse(val.ToString());
continue;
}
if (tiles.ContainsKey(key))
{
tiles[key] = val;
}
else
{
tiles.Add(key, val);
}
}
vm.DeleteOutput();
do
{
partitions = vm.Output.Partition(3);
foreach (var p in partitions)
{
var key = (p[0], p[1]);
var val = p[2];
if (key == (-1, 0))
{
score = int.Parse(val.ToString());
continue;
}
if (tiles.ContainsKey(key))
{
tiles[key] = val;
}
else
{
tiles.Add(key, val);
}
}
vm.DeleteOutput();
var ball = tiles.Where(x => x.Value == 4).First().Key;
var paddle = tiles.Where(x => x.Value == 3).First().Key;
var dir = ball.Item1.CompareTo(paddle.Item1);
vm.AddInput(dir);
vm.Run();
} while (vm.Running);
return(vm.LastOutput().ToString());
}