Advent Of Code

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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 7 SOLUTIONS - 🌉 (programming.dev)

submitted 1 week ago by [email protected] to c/[email protected]

51 comments fedilink hide all child comments

Day 7: Bridge Repair

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[–] mykl 6 points 1 week ago* (last edited 1 week ago) (2 children)

Uiua

This turned out to be reasonably easy in Uiua, though this solution relies on macros which maybe slow it down.

(edit: removing one macro sped it up quite a bit)

(edit2: Letting Uiua build up an n-dimensional array turned out to be the solution, though sadly my mind only works in 3 dimensions. Now runs against the live data in around 0.3 seconds.)

Try it here

Data   ← ⊜(□⊜⋕⊸(¬∈": "))⊸≠@\n "190: 10 19\n3267: 81 40 27\n83: 17 5\n156: 15 6\n7290: 6 8 6 15\n161011: 16 10 13\n192: 17 8 14\n21037: 9 7 18 13\n292: 11 6 16 20"
Calib! ← ≡◇⊢▽⊸≡◇(∈♭/[^0]:°⊂) # Calibration targets which can be constructed from their values.
&p/+Calib!⊃(+|×)Data
&p/+Calib!⊃(+|×|+×ⁿ:10+1⌊ₙ₁₀,)Data

[–] iAvicenna 3 points 1 week ago (1 children)

I feel like I need a Rosetta stone to read this code

[–] mykl 1 points 1 week ago (1 children)

Here you go

[–] iAvicenna 2 points 1 week ago

thanks that indeed is a Rosetta stone

[–] [email protected] 3 points 1 week ago (1 children)

Thanks to your solution I learned more about how to use reduce :D

My solution did work for the example input but not for the actual one. When I went here and saw this tiny code block and you saying

This turned out to be reasonably easy

I was quite taken aback. And it's so much better performance-wise too :D (well, until part 2 comes along in my case. Whatever this black magic is you used there is too high for my fried brain atm)

[–] mykl 2 points 1 week ago (1 children)

Haha, sorry about that, it does seem quite smug :-) I went into it expecting it to be a nightmare of boxes and dimensions, but finding it something I could deal with was a massive relief. Of course once I had a working solution I reversed it back into a multi-dimensional nightmare. That's where the performance gains came from: about 10x speedup from letting Uiua build up as many dimensions as it needed before doing a final deshaping.

I enjoyed reading a different approach to this, and thanks for reminding me that ⋕$"__" exists, that's a great idiom to have up your sleeve.

Let me know if there's any bits of my solution that you'd like me to talk you through.

[–] [email protected] 2 points 1 week ago

No worries, it does seem a lot less difficult in hindsight now, my mind just blanked at what I expected to be a lot more code :))

That performance improvement is amazing, I'll definitely take a look at how that works in detail later. Just gotta recover from the mental stretch gymnastics trying to remember the state of the stack at different code positions