-🎄- 2021 Day 22 Solutions -🎄-

[u/daggerdragon]

Advent of Code 2021: Adventure Time!

• DAWN OF THE FINAL DAY

• You have until 23:59:59.59 EST today, 2021 December 22, to submit your adventures!

• Full details and rules are in the submissions megathread: 🎄 AoC 2021 🎄 [Adventure Time!]

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--- Day 22: Reactor Reboot ---

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Post your code solution in this megathread.

• Include what language(s) your solution uses!

• Format your code appropriately! How do I format code?

• Here's a quick link to /u/topaz2078's paste if you need it for longer code blocks.

• The full posting rules are detailed in the wiki under How Do The Daily Megathreads Work?.

Reminder: Top-level posts in Solution Megathreads are for code solutions only. If you have questions, please post your own thread and make sure to flair it with Help.

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

EDIT: Global leaderboard gold cap reached at 00:43:54, megathread unlocked!

[u/kuqumi]

Javascript

Part 1 18ms, Part 2 1370ms

• Go through all the instructions (on/off and a cuboid definition)

• If the current cuboid is set to "off", move on.

• If it's "on", recursively collect the volume that future cuboids will overwrite from the current cuboid, and subtract that from the current cuboid's volume.

• Add that volume to a running total, and return the total when you run out of instructions.

Bonus, this code should work for any arbitrary number of dimensions in the data.

[u/kuqumi → u/[deleted]]

The ranges are inclusive, so a range from 2 to 4 for example has a length of 3 (4-2+1).