Advent of Code 2021

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.

If you'd like to support Advent of Code, you can do so indirectly by helping to Share it with others, or directly via PayPal or Coinbase.

Advent of Code is a registered trademark in the United States.