Task

Please see the separate task specification.

A slightly less pretty, but perhaps more accessible HTML version is also available.

The new problems released after the lightning round are described in the addendum.

A similar HTML version is also available.

Do you have any plan to publish modifications to the problem during the contest?
After the lightning round, a new set of problems with a complication will be introduced that will require more work to solve, aside from that: no plans.
Are the four possible labels evenly distributed across rooms?
Yes. For example, in a map with 30 rooms, eight rooms will have one label, eight rooms with another, and then the other two labels will both adorn seven rooms each.
In the /register request body - what is pl used for?
It's your choice of programming language. If you would like this changed or team details updated, please contact us and we can do this for you.

Sept 6, 12:00 UTC: Addendum Released
Sept 5, 13:35 UTC: 1.2 Released: Limit on route plan length.
Sept 5, 12:56 UTC: 1.1 Released: fixed references to a 6th door, minor error about route plan length.
Sept 5, 12:00 UTC: 1.0 Released