Advent of Code 2021
I really enjoyed the early part of this last year, but I got to Day 19 and suddenly it became<p>"if you memorized some mathematical concepts and an obscure algorithm and also recognize that this exact algorithm is the only efficient solution to the problem then you can solve this in 5 seconds, otherwise it will never finish running with any other algorithm".<p>I immediately quit.  I'm not doing these to prove I'm smarter than other people or memorized random math concepts, I'm doing this to practice writing code or to learn a new language.<p>Not sure if this is indicative of other years (This is the farthest I've persisted in the 3 I've tried) but it was EXTREMELY demotivating, and killed every desire to continue or to even try it again next year.<p>*EDIT*:  Apologies, I was incorrect on the Day where this happened.  It was actually Day 13, with the Chinese Remainder Theorem being the solution.  I must have copy/pasted a solution in frustration and continued past that point.  My mistake.