Advent of Code 2025 🥛🍪

This repo contains my solutions for different years.

• 2023 solutions in Golang here.
• 2024 solutions in Rust here.
• 2025 solutions in C here.

Days, stars and solutions

Benchmarks are run on an "AMD Ryzen 7 9800X3D @ 4.7/5.2GHz CPU".

Day	Solution	Stars	Parse benchmark	Part 1 benchmark	Part 2 benchmark
Day 1: Secret Entrance	Here	⭐⭐	72µs	24µs	26µs
Day 2: Gift Shop	Here	⭐⭐	2µs	11ms	72ms
Day 3: Lobby	Here	⭐⭐	22µs	15µs	41µs
Day 4: Printing Department	Here	⭐⭐	12µs	118µs	883µs
Day 5: Cafeteria	Here	⭐⭐	95µs	39µs	45ns
Day 6: Trash Compactor	Here	⭐⭐	28µs	76µs	22µs

Run it yourself

Run a day

While being at the 2025 directory:

make build
./aoc --day=<N> [--sample] [--bench=<N>]

--day=<N>: Day to run (1-25).

--sample: Optional. If set, the input file will be the sample.txt located in the inputs folder.

--bench=<N>: Optional. If set, runs the puzzle N times and outputs only the average execution times.

Example output