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<https://blog.jetbrains.com/kotlin/2021/11/advent-of-code-2021-in-kotlin/|Advent of Code 2021 in Kotlin – Win Prizes, Solve Problems, Have Fun!>
It’s that magical time of the year! Supermarkets are stocking cookies, the smell of cinnamon and roasted chestnuts fills the air, and maybe you’ll even see some snowflakes fall in front of your window. It can only mean one thing: Advent of Code is coming! It starts December 1, when the first of twenty-five coding […]

I’m really excited to see this, being a big proponent of AoC and Kotlin. The blog mentions that JetBrains are a supporter, but I don’t see it listed in the sponsors page.

<https://adventofcode.com/2021/sponsors>

Correct. We’ve already signed the sponsorship agreement, we’re just hashing out some last minute details :)

I also created a template for AoC2021 for my organization.  Learning from past years, I now adopted a "unit-test approach": every day solution is written as a unit test class. That allows to encode correct results in a standardized fashion, and easy debugging in IntelliJ. Details at <https://github.com/nkiesel/AdventOfCode2021>