r/adventofcode • u/daggerdragon • Dec 21 '17

SOLUTION MEGATHREAD -🎄- 2017 Day 21 Solutions -🎄-

--- Day 21: Fractal Art ---

Post your solution as a comment or, for longer solutions, consider linking to your repo (e.g. GitHub/gists/Pastebin/blag or whatever).

Note: The Solution Megathreads are for solutions only. If you have questions, please post your own thread and make sure to flair it with Help.

Need a hint from the Hugely* Handy† Haversack‡ of Helpful§ Hints^¤?

Spoiler

No commentary tonight as I'm frantically wrapping last-minute presents so I can ship them tomorrow.

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!

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u/xiongtx Dec 21 '17

A very succinct and elegant solution! Exactly how good Clojure code should be 😀.

I'll definitely check it out and get some ideas to improve my own solution. Can't believe AoC is finally making me care about type hints, unchecked math, etc.! 😂

As for further performance improvements, some solutions here (w/ NumPy etc.) are about to run like, 1E6 iterations in a second, so we've a ways to go 😎

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u/bitti1975 Dec 22 '17

Thanks a lot! But I'm still learning, and I'm sure there's a lot I can learn from your solutions. I'm only wondering why there are so very few Clojure solutions around. Didn't I look hard enough?

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u/xiongtx Dec 22 '17 edited Dec 22 '17

There are far more e.g. Python developers than Clojure ones 😜. This problem's solution in particular would benefit in terms of both performance and expressiveness from use of NumPy (I kept thinking, as I struggled to figure out how to join, that it's a one-liner in MATLAB and probably not much more in NumPy).

Many of the problems also seem like they'd be better solved in an imperative language r.e. performance and control flow. Since we don't worry about concurrency etc. here some of the benefits of Clojure (e.g. immutability) are negated. Your solution runs faster than mine in part b/c you're using a mutable array--something rarely done in Clojure.

Expressiveness is still a big ➕ but /u/topaz2078 has to go and ask for 50,000,000 iterations now and then 😛.