Advent of Code: Days 19 & 20 Videos

You can now find two more Advent of Code videos on our YouTube channel! You can see a summary of all my work on the Advent of Code summary page!

Here is the video for Day 19, another difficult graph problem involving efficient use of resources! (The write-up can be found here).

And here's the Day 20 video, a tricky problem involving iterated sequences of numbers. You can also read about the problem in our writeup.