Alright! The day 12 puzzle involves path finding, and it seems like a good time to lean more heavily on the WASM embeds I've set up for the previous parts.

Let's start by setting up the types we'll want!

Our input is a heightmap, like so:

Sabqponm
abcryxxl
accszExk
acctuvwj
abdefghi

Where 'a'..='z' is a square with a given elevation (from lowest to highest), is the start, and is the end.

Onwards! To the day 10 puzzle.

I don't see a way to make part 1 especially fun — so let's just get to it.

As usual, let's reach for the nom crate...

$ cargo add nom@7
(cut)

...to parse the input into nicely-organized Rust data structures:

// in `src/main.rs`

use nom::{
    branch::alt,
    bytes::complete::tag,
    combinatormap value
    sequencepreceded
    IResult



  
    Noop
    Addx


  
       ->   
         noop = 
         addx =  nomcharactercompletei32
        Noop noop addx Addxi
    

      ->  
          
            Noop => 
            Addx_ => 
        
    

The Advent of Code is not a sprint: it's a marathon: sometimes you've got to stop and smell the roses.

I... what? That's not.. have you done a marathon before?

No, and I haven't taken any creative writing classes either, I think you can tell. Anyway: Day 8 was a bit aggravating for me. In 2020 I gave up AoC after Day 14 I think, and then I skipped a year. It doesn't help that it overlaps some holidays and stuff, but!