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๐ง - 2025 DAY 2 SOLUTIONS - ๐ง
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this post was submitted on 02 Dec 2025
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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.
EC 2025
AoC 2025
Solution Threads
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 8 | 9 | 10 | 11 | 12 |
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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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There are interesting analytical observations to be made about the problem to sidestep most of the actual iteration, but I wasn't up to working it all out and the runtime was pretty much instant anyway.
Here's my original solution with ints, using divions with powers of 10 to do the splitting: day02-u64.c
But I'm only doing the C implementations to prototype my assembly solutions, and dealing with 64-bit numbers, especially divisions, on x86-16 is painful, so I rewrote the solution using a fixed-length string "numbers" instead: day02.c
Still working on the assembly version
Assembly update: have part 1 working now! It's dog slow on DOSBox, but on QEMU it's good: day02.asm