@SiebelsTim @todd.ginsberg Why should that input return

4

? The question is

How many rooms have a shortest path from your current location that pass through at least 1000 doors?

That's part 2. Part 1 wants to know about the longest shortest path, right?

I misunderstood both which part you're talking about and the drawing. You're right!

Yeah I wasn't really explicit about it :x