copy pasting the rules from last year’s thread:
Rules: no spoilers.
The other rules are made up aswe go along.
Share code by link to a forge, home page, pastebin (Eric Wastl has one here) or code section in a comment.
For 3: I made dart one-liners for both. Pasting the juicy parts.
3:1
RegExp(r"mul\((\d*),(\d*)\)").allMatches(input).fold<int>( 0, (p, e) => p + e.groups([1, 2]).fold(1, (p, f) => p * int.parse(f!))));
3:2
My original solution found do, don’t and mul entries, then stepped through them to get the solve. I decided to try regex my way through it. What I realised was that you want to ignore strings starting with don’t() and ending at the first do(). Some amount of trial and error later, I figured out the (ecma*) regex to do it, which I am proud of:
RegExp(r"(?:don\'t\(\)(?:.(?<!do\(\)))*do\(\))|(?:mul\((\d*),(\d*)\))") .allMatches(input) .fold<int>( 0, (p, e) => p + (e.group(0)![0] != 'd' ? e.groups([1, 2]).fold<int>(1, (p, f) => p * int.parse(f!)) : 0))
*ecma balls
