(journey stops seats)
Note: seats must be even!
(journey 10 30)
is what I used.
This is a whimsical simulator of the way in which I saw that I and other passengers on buses take our seats. We follow a two-step process:
- If there are whole seats with no one in them, sit there.
- If there aren't, sit next to someone.
And that's what I tried to simulate. It may be a general rule, or it might be a quirk of riding buses in just this city, but I thought it was a bit amusing.
Note that no more than nine passengers get on the bus at any one stop in this simulation.
Tested in GNU CLISP 2.49.93+ running on Fedora 29 64-bit.