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I'm using Ruby.
People often use AoC to learn a new language, but I'm trying to do well on a couple of the leaderboards I'm on, so I had to stick to what I know best.
I think it's a pretty good language to go fast in AoC with. It's bristling with features, and it's text munging abilities are excellent.
In these later levels though, there comes a point where you can't just brute force part 2 with your solution to part 1, and that point comes earlier for Ruby.
I live in Australia btw, so challenges come out at 4pm, which is very convenient for me. I'm not up at 5am every day.
What are you doing it in?