Note that regarding the outliers, in 2015 and 2016 the puzzles weren't as widely known, and in 2020, AWS' load balancers crashed and the puzzle was unavailable to most people for 6 minutes, then solved in a few minutes. https://adventofcode.com/2020/leaderboard/day/1 -- postmortem: https://old.reddit.com/r/adventofcode/comments/k9lt09/postmo...