There are three small trains, each of which runs on its own closed track in the direction specified by the parameters. If the train A runs in the public orbit, if the train B wants to enter the public orbit, the other train must wait until the train A leaves the public orbit and gives out the track. In order to prevent two trains from colliding on public tracks, a central control system must be provided to control the operation of trains.

Filename	Size	Update
test.c	18826	2016-06-28

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