Add me as someone else who didn’t use digraph and who just worked through lists (well maps) of planets. My solution is here.
simon
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ferd
Author of Property-Based Testing with PropEr, LYSE, & Erlang in Anger
michallepicki
Catching up with Gleam, also using digraph: adventofcode/2019/gleam/src/universal_orbit_map.gleam at master · michallepicki/adventofcode · GitHub
edit: First time using digraph so I didn’t know get_short_path exists and implemented my own silly search 
1
poligen
Thank you everyone here, this is my first time to understand algorithm about graph. And I am amazing about erlang’s standard documentation.
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montanonic
Some great solutions here!
I didn’t know of digraph, and also used the --/2 operator instead of sets (first time I’ve used it, it’s nice!).
https://github.com/montanonic/advent2019_elxir/blob/master/lib/day6.ex
0