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

Solution Threads

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console.log('Hello World')

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

submitted 3 weeks ago by CameronDev@programming.dev to c/advent_of_code@programming.dev

41 comments fedilink hide all child comments

Day 6: Guard Gallivant

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What is this?: Here is a post with a large amount of details: https://programming.dev/post/6637268
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[–] sjmulder@lemmy.sdf.org 3 points 3 weeks ago* (last edited 3 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.

[–] ximtor@lemm.ee 1 points 3 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 :)

[–] sjmulder@lemmy.sdf.org 1 points 3 weeks ago

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