Advent Of Code

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An unofficial home for the advent of code community on programming.dev! Other challenges are also welcome!

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.

Everybody Codes is another collection of programming puzzles with seasonal events.

AoC 2025

Solution Threads

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Follow the programming.dev instance rules
Keep all content related to advent of code in some way
If what youre posting relates to a day, put in brackets the year and then day number in front of the post title (e.g. [2024 Day 10])
When an event is running, keep solutions in the solution megathread to avoid the community getting spammed with posts

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Advent of Code Homepage

Credits

Icon base by Lorc under CC BY 3.0 with modifications to add a gradient

console.log('Hello World')

founded 2 years ago

MODERATORS

Ategon@programming.dev

Sigmatics@lemmy.ca

CameronDev@programming.dev

hades@programming.dev

💃 - 2025 DAY 3 SOLUTIONS - 💃 (programming.dev)

submitted 2 weeks ago by CameronDev@programming.dev to c/advent_of_code@programming.dev

32 comments fedilink hide all child comments

Day 3: Lobby

Megathread guidelines

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FAQ

What is this?: Here is a post with a large amount of details: https://programming.dev/post/6637268
Where do I participate?: https://adventofcode.com/
Is there a leaderboard for the community?: We have a programming.dev leaderboard with the info on how to join in this post: https://programming.dev/post/6631465

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[–] eco_game@discuss.tchncs.de 2 points 2 weeks ago (1 children)

Nice! I thought about using numbers but then decided that strings are a lot easier to deal with.

[–] chunkystyles@sopuli.xyz 1 points 2 weeks ago (2 children)

I was curious, so I ran yours and it is only like 3-4ms slower. I was honestly surprised it was that close.

Just goes to show that we're often wrong when estimating and the only real way to know is to benchmark.

[–] eco_game@discuss.tchncs.de 2 points 2 weeks ago

Yeah, I vaguely remember reading something about how close string splitting is to all the logarithm math in splitting numbers, and since then I've just always used strings because that's way more intuitive to me lol

[–] Deebster@programming.dev 2 points 2 weeks ago

My version used strings as well, and I thought that as I was comparing small integers either way, it made sense to stay in ASCII as the strings were already easy to index, and it meant I could skip parsing input numbers, only needing to parse output numbers so they could be summed.

I did start with numbers so I could convert it back to compare, but it's so fast (the whole thing takes 1ms - and that's reading/parsing the input twice) that it's almost a micro benchmark.