On: Solving a Dungeons and Dragons riddle using Prolog

[Labo333]

From a more algorithmic point of view, this is exactly the task of topological sorting [1].

And it runs linearly in the number of edges!

I expect Prolog to be slower for large and hard inputs. But Makefiles solve exactly that!

[1]: https://en.m.wikipedia.org/wiki/Topological_sorting