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
Python
def process(input, part2=False): if part2: input = re.sub(r'don\'t\(\).+?do\(\)', '', input) # remove everything between don't() and do() total = [ int(i[0]) * int(i[1]) for i in re.findall(r'mul\((\d+),(\d+)\)', input) ] return sum(total)Given the structure of the input file, we just have to ignore everything between don’t() and do(), so remove those from the instructions before processing.
Sub was my first instinct too, but I got a bad answer and saw that my input had unbalanced do/don’t.
I did wonder if that might be the case, I must have been lucky with my input.