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)
- You can send code in code blocks by using three backticks, the code, and then three backticks or use something such as https://topaz.github.io/paste/ if you prefer sending it through a URL
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 experimental feature of
foldto track the running state of do/don’t.[edit] Slightly re-written to make it less painful :-) Try it online!
# 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)regexGetMul DataP₁ # Part 1 # Build an accumulator to track running state of do/don't Filter ← ↘1⊂:∧(⍣(0 °"don"|1 °"do("|.◌)) :1≡(↙3°□) ≡⊢ regex GetMulDoDont DataP₂ ▽⊸≡◇(≍"mul"↙3)▽⊸Filter # Apply Filter, remove the spare 'do's &p/+≡◇(/×≡◇⋕↘1⊢regexGetMul) # Get the digits and multiply, sum.