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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console.log('Hello World')

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💂 - 2024 DAY 6 SOLUTIONS - 💂 (programming.dev)

submitted 2 weeks ago by [email protected] to c/[email protected]

41 comments fedilink hide all child comments

Day 6: Guard Gallivant

Megathread guidelines

Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever)
You can send code in code blocks by using three backticks, the code, and then three backticks or use something such as https://topaz.github.io/paste/ if you prefer sending it through a URL

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What is this?: Here is a post with a large amount of details: https://programming.dev/post/6637268
Where do I participate?: https://adventofcode.com/
Is there a leaderboard for the community?: We have a programming.dev leaderboard with the info on how to join in this post: https://programming.dev/post/6631465

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[–] [email protected] 3 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

I draw ^>v< characters on the grid while walking, so then it's a direct array lookup (instead of a hashtable). The representation could be better though, some kind of bitmask would beat checking against a bunch of characters.

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

I dont change the map, i just record the steps in the hashtable. But maybe drawing on the map is indeed shaving some time off, thanks for the input :)

[–] [email protected] 1 points 2 weeks ago

It probably won’t matter a whole deal but array indexing involves no comparisons or searches. And I found it convenient too!