public string Process2()
{
var previous = new SeatLayout(ToString());
foreach (var seat in _seats.Values)
{
if (seat.Status == SeatStatus.Floor)
{
continue;
}
var seen = previous.SeenFrom(seat.Row, seat.Column);
if (seat.Status == SeatStatus.Occupied && seen.X >= 5)
{
seat.Status = SeatStatus.Empty;
}
else if (seat.Status == SeatStatus.Empty && seen.X == 0)
{
seat.Status = SeatStatus.Occupied;
}
}
return(ToString());
}