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Overall, I think this year felt a lot easier than the last one. Almost no graph problems, no path finding algorithms, and no insane math problems like day 22, 2019. It's really hard finding the right balance. I think 2019 was maybe a bit too hard and discouraged a lot of people. I like that this year was more approachable but perhaps it was a bit too easy towards the end.
Really simple today (...although I did spend a while scratching my head as I'd accidentally put an extra 0 in the divisor...which infuriatingly works for the example card number, but not for the door number).
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