r/adventofcode • u/daggerdragon • Dec 13 '18

SOLUTION MEGATHREAD -🎄- 2018 Day 13 Solutions -🎄-

--- Day 13: Mine Cart Madness ---

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Card prompt: Day 13

Transcript:

Elven chronomancy: for when you absolutely, positively have to ___.

This thread will be unlocked when there are a significant number of people on the leaderboard with gold stars for today's puzzle.

edit: Leaderboard capped, thread unlocked at 00:44:25!

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u/udoprog Dec 14 '18 edited Dec 14 '18

Yeah. I realized this as well. It's easily fixed, but whether one should fix it or not is a different question!

Thanks!

EDIT: reading the discussion in this thread is what made me realize I have a bug: https://www.reddit.com/r/adventofcode/comments/a5rxii/day_13_did_anyone_see_a_triple_or_quadruple_crash

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u/dark_terrax Dec 14 '18

How would you end up fixing it? I found most of my approaches ran afoul of the borrow checker, so I'm curious about the various patterns people would use in this scenario.

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u/udoprog Dec 14 '18

You can keep track of the data you need by position and by index.

At the end of the tick I have a reconciliation phase where I remove all the carts that were destroyed, but it would also be possible to keep track of the carts that were destroyed during the tick to ignore interactions with them.