public override void PartTwo()
{
Grid <int> map = Input.Select2D(c => c == '#' ? 2 : 0).ToGrid();
Carrier = map.Bounds.MidPos;
Direction = Pos.Up;
var infections = 0;
void Step()
{
var state = map[Carrier];
if (state == 0)
{
Direction = Direction.CounterClockwise();
}
else if (state == 2)
{
Direction = Direction.Clockwise();
}
else if (state == 3)
{
Direction = -Direction;
}
infections = (map[Carrier] = (state + 1) % 4) == 2 ? infections + 1 : infections;
Carrier += Direction;
}
foreach (var _ in Enumerable.Range(0, 10_000_000))
{
Step();
}
WriteLn(infections);
}
public override void PartOne()
{
Grid <bool> map = Input.Select2D(c => c == '#').ToGrid();
Carrier = map.Bounds.MidPos;
Direction = Pos.Up;
var infections = 0;
void Step()
{
if (map[Carrier])
{
Direction = Direction.Clockwise();
}
else
{
Direction = Direction.CounterClockwise();
}
infections = (map[Carrier] = !map[Carrier]) ? infections + 1 : infections;
Carrier += Direction;
}
foreach (var _ in Enumerable.Range(0, 10000))
{
Step();
}
WriteLn(infections);
}