Advent of Code is a series of 25 small programming challenges, created by Eric Wastl, see https://adventofcode.com/.
There are small and bigger puzzles, which you can solve typically in half an hour to a few hours. (Looking at the leaderboard, the top aces can do them in less than 10 minutes.)
It's an ideal way for beginners to start learning a computer language, and for advanced people to sharpen their programming skills.
To help you get trained for this year's challenges which start at December 1st, I will try to solve and comment the puzzles from 2016.
