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You can check the subreddit https://www.reddit.com/r/adventofcode/

Usually each day there is a mega thread with people sharing their solutions

A really cool thing about the subreddit is they archive all the megathreads so if you want to do the old advents you can still find some discussion / hints / …

Sadly not the various help or complaint threads, or the mad lads playing up the ante, but…

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