p88h x Advent of Code 2025 (Hello, Odin)

This is a repository containing solutions for the 2025 Advent of Code (https://adventofcode.com/).

This years language of choice is Odin.

After installing Odin, you should be able to run the solutions code by using

# run all days
$ odin run src
# run one specific day 
$ odin run src -- 4

There are also some Makefile targets, you can use make help to list what that does. You can pass odin flags like o:speed before --

Benchmarking

Automatic, the runner always benchmarks the results.

Reference benchmark results are added here as well (BENCHMARKS.md) Some solutions use multi-threaded execution which is automatically enabled.

Tests

Each day has test code that is basically the test input validation. You can run this via either:

$ make test
$ odin test src

Additional options

You can pass additional options (after --) to the runner:

debug disables benchmarking and runs the specific day only once. Mostly useful when debugging.
single disables multi-threading. Note debug mode does not use multithreading as well.

# run day 5 in debug mode
$ odin run src -- 5 debug
# run all days single threaded
$ odin run src -o:speed -- single

Visualisations

vis directory contains visualisations for all days implemented with Raylib. To get this to run you can try:

$ odin run vis
# run & record select a specific day 
$ odin run vis -- rec 23

You can use day selection as with regular runner. Using rec, the visualisation will be recorded to file out.mp4. This requires ffmpeg to be installed locally.

If you don't care about tinkering with build system enough, visualisations are also published to YouTube

You can also hop on straight to the 2025 playlist

Copyright disclaimer

Licensed under the Apache License, Version 2.0 (the "License"); you may not use these files except in compliance with the License. You may obtain a copy of the License at

https://www.apache.org/licenses/LICENSE-2.0