Advent Of Code

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An unofficial home for the advent of code community on programming.dev!

Advent of Code is an annual Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.

AoC 2024

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🛜 - 2024 DAY 8 SOLUTIONS -🛜 (programming.dev)

submitted 1 week ago by [email protected] to c/[email protected]

30 comments fedilink hide all child comments

Day 8: Resonant Collinearity

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[–] [email protected] 2 points 1 week ago (1 children)

I also did it in Rust, though mine is quite a bit more verbose than yours :). https://gitlab.com/bricka/advent-of-code-2024-rust/-/blob/main/src/days/day08.rs?ref_type=heads

Have you considered using a HashSet<(usize, usize)> to store the visited locations instead of a 2d vector?

[–] [email protected] 1 points 1 week ago

I try to use Vecs instead of HashSets and maps whenever the key domain is reasonably small (just the grid in this case), simply because in the end direct memory access is a lot faster than always hashing values.

But looking at this case again, it is certainly a lot easier to have just antinodes.len() at the end instead of counting all true values. This datastructure is also not really performance-critical, so a HashSet is probably the cleaner choice here.