My fourth Advent of Code. It's time for Rust 2021! Having gained some experience from past events, this time I strive to optimize for performance. Beware of unsafe Rust!

Objective: Solve all puzzles in less than 1 second.

• 11th Gen Intel(R) Core(TM) i7-11850H: 905.9 ms ± 7.6 ms [User: 896.8 ms, System: 9.0 ms]