My solutions for Advent of Code 2020.
I'd done a couple puzzles from a previous AOC (2017, I think), but had never participated as it was ongoing. It was much more fun than I expected!
This was also used as an opportunity to try out coding in an IDE, instead of Jupyter (I'd previously seen Joel Grus's "I Don't Like Notebooks" talk and was curious to see how it would differ), as well as using type hinting and mypy.