Use lower-complexity graph traversal algorithms

[juliavdkris]

As mentioned in #28 (comment), it might be nice to algorithmically optimize the graph traversal in some places.

Right now I don't think we'll have much problems with performance, considering the graphs are pretty small. Marking this issue as low priority for the moment.

I'll look into it At Some Point™, with the remains of my ✨algorithms and data structures✨ knowledge