I realize it is perhaps a bit late to post this, but I thought some of the programmers on here might still get some fun out of it this year. From the about page:
Advent of Code is an Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like. People use them as a speed contest, interview prep, company training, university coursework, practice problems, or to challenge each other.
You don't need a computer science background to participate - just a little programming knowledge and some problem solving skills will get you pretty far. Nor do you need a fancy computer; every problem has a solution that completes in at most 15 seconds on ten-year-old hardware.
https://adventofcode.com/2019Personally, I am using it as a way to try out the Rust programming language this year
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