Comment by Volundr

Day 22 (https://adventofcode.com/2021/day/22) is the one that nearly killed me in 2021. I did get it using a technique of breaking any overlaps into smaller and smaller rectangles, but it took like 30s to run. I looked on the AoC reddit, and honestly I still don't understand what I needed to do to make it better, but visualizing 3d spaces has always been a weakness for me.