Advent-of-Code VS advent-2021

For example, this was my solution for day 01 2021

To find the match, I created a Jupyter Notebook to visualize the points with the simple example. After staring 30 minutes into 3d charts, I finally figured out that whenever I find a rotation that matches, then there must be a vector v, which occures a lot of times when comparing each p1 from scanner 1 with each point p2 from scanner 2, because we only have to shift it by this vector to align with the scanner 0 (see jupyter notebook first plot).

Python 3, <1ms runtime

Python3

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).