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Date: Mon, 28 Dec 2020 13:48:16 -0800 (PST)
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Subject: Advent of Code, Day 23
From: John Perry <john.perry@usm.edu>
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(For those who are interested. I'm a bit behind, but I don't think anyone else on Maxim's list has finished, either.)

Day 23 (Crab Cups) required some cleverness. The first puzzle is solved with a simple solution, and the second puzzle is easily generalized from it... but will take a LONG time (hours certainly, days possibly) unless you rethink the data structure.

Looking at others' solutions, it seems that Gautier, Maxim, and I have similar approaches, but all of us use slightly different data structures.