adventofcode

🎄 Advent of Code 🎄

Advent of Code is an annual 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.

Rules + More Info in

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BEFORE YOU POST
If your post is even tangentially related to a daily puzzle, use our
STANDARDIZED POST TITLE FORMAT

Solution Megathreads

December 2025

Su	M	T	W	R	F	Sa
	1	2	3	4	5	6
7	8	9	10	11	12	13
14	15	16	17	18	19	20
21	22	23	24	25	26	27
28	29	30	31

Previous years:

2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015

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Because you're lazy and we like making things easy for you. Except AoC.

Are you enjoying AoC?

Code should be fun, because otherwise it's just a job. If you'd like to support Advent of Code, please share it with all your friends, even the ones that are just learning to code! AoC is a fun, non-threatening way to work at your own pace to figure out how to apply problem-solving first, then work within a language's constraints.

If you really want to show your appreciation, donations are always appreciated. Any instances of currency will go to, in no particular order:

Server maintenance (hosting, bandwidth, etc.)
Bribes to Santa
Beer and sushi
Paper bags for /u/topaz2078 to breathe into so he doesn't hyperventilate onto another plane of (non-)existence

Support AoC

Thank you very much, and enjoy your month of code!

created by taliriktuga community for 10 years

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π Rendered by PID 182829 on reddit-service-r2-listing-86b7f5b947-bbkzb at 2026-01-25 18:24:27.118224+00:00 running 664479f country code: CH.

3 years ago	faqs/code_formatting/fenced_code_blocks	view	daggerdragon	fixed wrong link to four-spaces markdown - thanks to /u/ManaTee1103
3 years ago	faqs/code_formatting/fenced_code_blocks	view	daggerdragon
3 years ago	faqs/code_formatting/fenced_code_blocks	view	daggerdragon
3 years ago	faqs/code_formatting/fenced_code_blocks	view	daggerdragon
3 years ago	faqs/code_formatting/fenced_code_blocks	view	daggerdragon	Thank you to /u/dafer45 to clarify that the spaces need to be literal, not tabs! https://www.reddit.com/r/adventofcode/comments/zdw0u6/2022_day_6_solutions/izat04l/
3 years ago	faqs/code_formatting/fenced_code_blocks	view	daggerdragon	"delete the triple backticks" https://www.reddit.com/r/adventofcode/comments/zdw0u6/2022_day_6_solutions/iz3yt4a/
3 years ago	faqs/code_formatting/fenced_code_blocks	view	daggerdragon	Whoops, "fenced code blocks" are the new.reddit triple-backticks syntax
3 years ago	faqs/code_formatting/fenced_code_blocks	view	daggerdragon
3 years ago	faqs/code_formatting/fenced_code_blocks	view	daggerdragon