least common multiple. It's also what popped into my head when I first saw the fizzbuzz problem.
I've only done 2019 and 2020, but found 2020 to be a lot easier. I got stuck for a day or two on one of the 2019 ones. The one point I was briefly stuck in 2020 was when I was using the wrong data structure. (I don't want to spoil anything.)
Yeah 2019 had a couple of mind-benders involving mazes - there are two Part 2s that I need to motivate myself to come back to because my fumbling that got me the respective Part 1 solution was useless for Part 2 (Day 18 and Day 20). Looking back at them they shouldn't be too hard, I just think that at that moment I didn't have the time to spare and never felt like coming back to them. Maybe if I'm bored between Xmas and New Year :)
I've only done 2019 and 2020, but found 2020 to be a lot easier. I got stuck for a day or two on one of the 2019 ones. The one point I was briefly stuck in 2020 was when I was using the wrong data structure. (I don't want to spoil anything.)