I'm coding a bus schedulling system.Can anyone help me some clues on scheduling?

Answer 1

Yes - in the real world everything that can go wrong will go wrong :-)

Examples -
Bus leaves depot and never comes back (breaks down or sent to another depot or scrapped off)
Bus never leaves the depot (broken down, and then gets towed away to be repaired)
Bus leaves depot with one route number & changes to another route number at some time during the day (eg. gets diverted to pick up passengers from broken down bus)
More Busses leave than you have Drivers (Manager takes one out, one or more Drivers fail to 'clock in')
More Busses return than leave (one from another Depot is diverted, new Busses are purchased)
More Drivers leave than Busses (Driver takes sick en-route - another Driver completes the route)
etc etc.

Oh - and some Busses will leave but the Manager won't be there to 'log it out' (ore a Bus will return and not be 'logged in')... and sometimes the Manager will enter the wrong route number for a leaving/returning Bus ...

Finally, you will discover some routes are 'forbidden' to some Busses (low bridge, no double deckers :-)), some Drivers will either not be trained on all routes or will refuse to take the Bus out on some routes after dark -- and Drivers will go on holiday, go sick and quit .. all to muck up your schedule..