Suppose you have two trains of the same length travelling on the same
track on opposite directions, towards each other.

  In the middle the track splits into a double track for a certain distance,
but this distance is slightly smaller than the length of either train.

  The task is to make the trains pass each other so that they can continue
their journey.

  The trains cannot be split and you can't remove anything from the trains.
The track cannot be modified, and you cannot build additional track.

-- 
                                                          - Warp

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