Posted my #AdventOfCode #PHP solution for Day 9 here:
https://gitlab.com/nicolapcweek94/advent-of-code/-/blob/master/src/day9.php
https://old.reddit.com/r/adventofcode/comments/k9lfwj/2020_day_09_solutions/gf572ke/
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.
