☃️ - 2023 DAY 4 SOLUTIONS -☃️
☃️ - 2023 DAY 4 SOLUTIONS -☃️
Day 4: Scratchcards
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FAQ
- What is this?: Here is a post with a large amount of details: https://programming.dev/post/6637268
- Where do I participate?: https://adventofcode.com/
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APL
I'm using this years' AoC to learn (Dyalog) APL, so this is probably terrible code. I'm happy to receive pointers for improvement, particularly if there is a way to write the same logic with tacit functions or inner/outer products that I missed.
input←⊃⎕NGET'inputs/day4.txt'1 num_matches←'Card [ \d]+: ([ 0-9]+) \| ([ 0-9]+)'⎕S{≢↑∩/0~⍨¨{,⎕CSV⍠'Separator' ' '⊢⍵'S'3}¨⍵.(1↓Lengths↑¨Offsets↓¨⊂Block)} input ⎕←+/2*1-⍨0~⍨num_matches ⍝ part 1 ⎕←+/{⍺←0 ⋄ ⍺=≢⍵:⍵ ⋄ (⍺+1)∇⍵ + (≢⍵)↑∊((⍺+1)⍴0)(num_matches[⍺]⍴⍵[⍺])((≢⍵)⍴0)}(≢num_matches)⍴1 ⍝ part 2I just posted a solution in Uiua, which is also probably equally terrible, but if you squint you can see some similarities in our approaches.
I haven't heard of Uiua before, but I can read some things :D I like the idea of rotating the vector instead of manually padding it with the required number of leading zeroes!
I think it's only a few months old. I've enjoyed playing with it because it allows me to use stack manipulation as an alternative to combinators and every symbol has a fixed arity both of which make it feel a lot more accessible to me.
I was very pleased with myself when I thought of that rotation trick :-)