[LANGUAGE: Rust]

My Day 19 on GitHub

A pretty straightforward day overall, using ranges of numbers for part 2 (as was the case with one of the puzzles earlier in the month), only this time constructing new 4d ranges (always fun to create a Tesseract data type, too 😁) and passing them on to another workflow or to the next step in this workflow as appropriate.

Rust is great to use for these problems. You get to write high-level code with a structure of well-defined data types, but then the compiler comes in and optimises it into something that calculates both parts here in less that one millisecond total.