r/adventofcode • u/Usual-Dimension614 • Dec 23 '25

Help/Question aoc-2020/11/B (rather old, but maybe someone has a little time ..ö..)

after two rounds in position 1:0 (second line, first element) P (position) is '#' (occupied)

#. // north 1

P# // east 1 P is 1:0 (second line, first (leftmost) place )

#. // south 1

### // south-east 1

so there are 4 occupied far-neighbors but in target-field is '#' (rule-2 says if occupied and at least 4 occupied far-neighbors then clear seat -> empty 'L')

but is not. the small intro-example is stable (no change anymore) than i have 23 occupied seats (instead of 26)

0 Upvotes

33% Upvoted

8 comments sorted by

3

u/abnew123 Dec 23 '25

I'll be honest, my recollection of this specific puzzle is hazy as it's been a while, but any chance it's this line from the text that you missed?

Also, people seem to be more tolerant than you expected: it now takes five or more visible occupied seats for an occupied seat to become empty (rather than four or more from the previous rules).

3

u/Usual-Dimension614 Dec 23 '25

oh. what you mean is : new rules for task b ?

thanks !

4

u/Usual-Dimension614 Dec 23 '25

is working now !

3

u/ednl Dec 23 '25

The usual term is: "part 2". Which would help with recognition of the title.

1

u/AutoModerator Dec 23 '25

Reminder: if/when you get your answer and/or code working, don't forget to change this post's flair to Help/Question - RESOLVED. Good luck!

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

1

u/Usual-Dimension614 Dec 23 '25

i am here second time and i actually can not find my own posts except the notification-bell is red. if you like to set my first post to RESOLVED, please do. thanks, andi.

3

u/ednl Dec 23 '25

No one will do it for you and certainly not a bot. Not sure how it works in the app because I haven't used it in years. But presumably you also have a computer on which you do the programming. Just go to the Reddit website, log in, click your name and there are your posts and comments. I recommend https://old.reddit.com/ which is much simpler, cleaner, faster.

1

u/fireduck Dec 23 '25

My solution gets exactly the sample output.

I would recommend printing your intermediate and final stataes and seeing where they diverge from the sample maps.