adventofcode-21 VS advent-2021

Email: [email protected]

Some code at: https://github.com/ciju (i.e https://github.com/ciju/adventofcode-21 )

Few things I have written about:

https://ciju.in/posts/understanding-timezones (in progress)

Elixir

Elixir (github). About 4s on my laptop.

Rust https://github.com/Crazytieguy/advent-2021/blob/master/src/bin/day22/main.rs Imagining the geometry of this was very tricky for me. For a while I contemplated if calculating the intersection of each pair of cuboids would give me enough information to know how many cubes are on at the end, and finally decided that I would also have to calculate the intersections of those and so on, so I gave up. Instead I decided that my state will be a vector of cuboids that are garuanteed to be non overlapping, and on each command I would subtract the current cuboid from each of these non overlapping cuboids (leaving 1 to 6 cuboids depending on intersection), and finally either add in the current cuboid (for on command) or leave it out (for off).