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 6 SOLUTIONS - 💂 (programming.dev)

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

33 comments fedilink hide all child comments

Day 6: Guard Gallivant

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[–] [email protected] 0 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

I created rows and cols vecs that keep places of blocks. When moving, I binary search the row or col, find the block that stops me. So moving whole sections at once. Otherwise used HashSet of pos and dir like you. Also in part 2, place the new block only on the path I take in part1. Part 2 is 26ms.

code

[–] [email protected] 0 points 2 weeks ago

The binary search sounds smart, would reduce the pathing quite a bit i guess :)

Part 2 i approached quite the same i think, was only a couple lines of code additionally. But running 5ms 5000 times is also gonna take a while..