Advent of Code 2025

My body is ready

From https://adventofcode.com/2025/about

Advent of Code is an Advent calendar of small programming puzzles for a variety of skill levels that can be solved in any programming language you like. People use them as interview prep, company training, university coursework, practice problems, a speed contest, or to challenge each other.

[!NOTE] Zed, like a lot of IDE, like add a empty line at the bottom when you press save. For input file sometimes I created in Zed other times I created in nvim. So some solutions would remove the last line and while other won't. Apologize in advance.

Edit: I realized in Day 9 all the puzzles have part 2... I guess I'll revisit once i catched up...

I may (or may not) use a different language for each day:

• Day 1: Swift
• Day 2: Zig
• Day 3: Go
• Day 4: C
• Day 5: Haskell
• Day 6: Rust
• Day 7: Python
• Day 8: Kotlin
• Day 9: JavaScript
• Day 10: Nim
• Day 11: OCaml
• Day 12: Julia