This year for sure edition™
Stuck on this one for 4 days. Didn't think I could do it, but we are so back! I figured out the scanline idea myself, but couldn't get it to work properly. Mainly I was missing the part about "U" and "non-U" bends. This comment was really helpful for getting me back on track.
Alright, I'm leaving this one in 2023. I couldn't do it. I'd rather grind LeetCode than bash my head at this thing until I solve it. Perhaps by next year I will have the necessary skills.