first draft of pr1... turns out there are quite a few subleties involved, this will definitely evolve
in principle it could work like that, but using undirected edges and keeping books as nodes might be better
Quickly hacked (half hour) alternative method, should probably work
but I misread the getline documentation so the parsing is not
correct... gotta run though.
easy peasy
cleaner parsing and output, works like a charm apparently
start working on concrete examples
Better starting point for demos tomorrow as well as for the next project.
it would actually make sense to show student this simplistic solution
tweak