Day 11: Reactor
Megathread guidelines
- Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever)
- You can send code in code blocks by using three backticks, the code, and then three backticks or use something such as https://topaz.github.io/paste/ if you prefer sending it through a URL
FAQ
- What is this?: Here is a post with a large amount of details: https://programming.dev/post/6637268
- Where do I participate?: https://adventofcode.com/
- Is there a leaderboard for the community?: We have a programming.dev leaderboard with the info on how to join in this post: https://programming.dev/post/6631465
I did linear algebra with sympy over Q to reduce the search space to nullspace x [-N,N] grid (which is generally <=2 dimensional in these inputs and N<50 seems sufficient in most cases) then made easy work of it with vectorization. Similarly for part 2 did linear algebra over F2 but the search grid is also much smaller [0,1] x nullspace