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xkcd #173: Movie Seating (20 Oct 2006)
(programming.dev)
cross-posted from: https://programming.dev/post/8619086
Title text:
It's like the traveling salesman problem, but the endpoints are different and you can't ask your friends for help because they're sitting three seats down.
Links:
the problem here is technically not you knowing people but that the people you know can also know people that you don't know, expanding the graph beyond the first layer that you personally observe.
tl;dr: don't allow recursive invites