Advent of Code is a yearly series of 25 puzzles that are released between the first and 25th of December. You might have heard of them, lot's of people do them – to have fun, to show off their speed, or to learn a new language.
We'll be going through these puzzles, doing them in Solidity (and JS) - https://github.com/ethsgo/aoc
The first puzzle came out just today, so it's not late to start following along. Here is what the solution for today looks like (not adding the code to this post itself to avoid spoilers - https://github.com/ethsgo/aoc/blob/main/contracts/_01.sol#L18).