advent-of-code-2020 VS advent-of-code

There is a really good explanation for the solution here: https://github.com/tpatel/advent-of-code-2020/blob/main/day03.js

Code: https://github.com/tpatel/advent-of-code-2020/blob/main/day21.js

For a full write-up, see this repo, and for a non-annotated solution, see:

Otherwise, the main way I solved this was with a flat list of tokens rather than a truly nested structure. This was very similar to last year's Day 18, which I also solved in a similar manner.

Code can be found in this repo.

code

First 2D one! Got to reuse my InfiniteGrid class, which made this much easier.

Mine only took about 2 minutes when I originally recorded it. I've since added some optimizations to my Intcode computer, and re-running my original program with the optimized computer now runs in about 45 seconds. 😁

Here is my solution in JS, which also has a long comment explaining the main iterative loop.

Your solution is very similar to mine, and I too found that using an Array of a set size was way faster than an ordinary Object. I believe it has to resizing the array / object.

Main code for part two here, with comments, and full code for all parts found here.