Day 3: Mull It Over
Megathread guidelines
- Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever)
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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/
- Is there a leaderboard for the community?: We have a programming.dev leaderboard with the info on how to join in this post: https://programming.dev/post/6631465
Uiua
Uses (abuses?) experimental features of
foldto track the running state of do/don’t state. Although it works well and fast, I don’t think I would recommend this code to anyone :-) Try it if you must!# Experimental! DataP₁ ← $ xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5)) DataP₂ ← $ xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5)) GetMul ← $ mul\((\d{1,3}),(\d{1,3})\) GetMulDoDont ← $ mul\(\d{1,3},\d{1,3}\)|do\(\)|don\'t\(\) &p/+≡(/×≡⋕↘1)regex GetMul DataP₁ # Part 1 # Build an accumulator to track running state of do/don't Filter ← ≡⋕↘1◌∧(⍣("0" °"n"|"1" °"("|.◌)) :"1"∵◇⊡2 regex GetMulDoDont DataP₂ ▽⊸≡(¬≍"do()"°□⊢)▽⊸Filter # Apply Filter, remove the spare 'do's &p/+≡(/×≡⋕↘1⊢regexGetMul°□⊢) # Get the digits and multiply, sum.