gifski VS advent_of_code

You can do that with ffmpeg, but the output isn't ideal

I'd use gifski: https://gif.ski/

If image quality is more important than size then give Gifski a try. No idea how it's on win but on a mac it's my default GIF solution.

To make a legitimate high quality GIF, you can try Gifski. YMMV, I haven't tried using it yet but that's what some of the people at highqualitygifs say they use to make actual GIFs.

To convert only - https://gif.ski

gifski does a great job at being relatively simple, while handling quality stuff for you.

https://gif.ski/

gifski --fps 10 --width 320 -o anim.gif video.mp4

Here's the relevant extract from my (recursive) solution. Full code on GitHub.

Like others, I used lcm. Here's an extract of the solution, omitting parsing and main(). Full solution on GitHub.

Solutions to parts 1 and 2 nearly identical and pretty much worked first time. Nothing clever here. This was far simpler than I thought it would be. I probably spent most time trying to think of a mathematical way of getting all points between p1 and p2. In the end, I just constructed two ranges. Full code here.

Full code on github.

The core of my solution below using numpy (because I'm learning it!). See github for full code.

Python 3 solution using numpy. I got held up because I assume (but know better) that numpy arrays are [x,y] instead of [row, col], which is [y,x].

Below is the new solution, which works for part 1 and 2. The full code is on GitHub.

These are the key functions. The whole code is on GitHub

Part 2 (extract shown below) was a matter of starting with the low points found in part 1 then recursively looking around for relevant points. Full code on GitHub

Code is on GitHub.