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Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time

adventofcode.com

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Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time

#71
Awesome!

Yy usual 5-to-7-day output scramble will now look vastly more competent, ah, well, complete. Not actually be smarter, mind you, but radiate the comforting glow of effort by someone who has their temporal ducks in a suspiciously photogenic row.

Improvement? No. But the illusion of improvement? Practically Nobel-worthy. I'm already enjoying this change.

Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time

#72
post #21

Earlier quoted context omitted.

> And with that, I had to remind myself: Advent of Code isn't about there being 25 puzzles Really? The name of the event is "Advent of Code". Having 25 puzzles is easily its most strongly-determined aspect. You could argue for 23-29 puzzles, or perhaps for 5, but at 12 what's the name supposed to refer to?

Well advent calendars traditionally had 24 doors.

This lead me done a rabbit hole on wikipedia:

Advent calendars in their earliest forms were invented approx. 80 years ago.

The four week advent period goes back to the 7th century and was introduced by pope Gregory I..

Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time

#73
post #71

Awesome! Yy usual 5-to-7-day output scramble will now look vastly more competent, ah, well, complete. Not actually be smarter, mind you, but radiate the comforting glow of effort by someone who has their temporal ducks in a suspiciously photogenic row. Improvement? No. But the illusion of improvement? Practically Nobel-worthy. I'm already enjoying this change.

I'm not sure how to parse all this, but I really appreciate the mental image of temporal ducks in a photogenic row. Sounds great for my Star Trek themed, very slow Sunday morning.

Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time

#74
post #68

Earlier quoted context omitted.

Agreed, I didn't mean to critique you!

I appreciate you working out the math above! :). (I never could wrap my head around all this. I had enough problems with Easter events, where the math makes a detour through a Lunar calendar.) EDIT: And my memory of the Tradition is wrong too, it's supposed to be 24 - as confirmed by https://news.ycombinator.com/item?id=45710618 , and corroborated the two "Paw Patrol" themed Advent Calendars I just found still stashe…

The Sunday after the first full moon after March 21st (first day of spring) - what could possibly be confusing about that?!

j/k ;-)

Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time

#75
post #74

Earlier quoted context omitted.

I appreciate you working out the math above! :). (I never could wrap my head around all this. I had enough problems with Easter events, where the math makes a detour through a Lunar calendar.) EDIT: And my memory of the Tradition is wrong too, it's supposed to be 24 - as confirmed by https://news.ycombinator.com/item?id=45710618 , and corroborated the two "Paw Patrol" themed Advent Calendars I just found still stashe…

The Sunday after the first full moon after March 21st (first day of spring) - what could possibly be confusing about that?! j/k ;-)

I still find it easier to explain it as "14 Nisan *energetic hand wave*!!" :).

Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time

#76
This is completely tangential but as someone who used to be a competitive programmer in the 2010s, I feel like this year marked the end of an era for me.

I don't have time to do regular codeforces/atcoder/leetcode rounds (and the rampant AI cheating is pretty demotivating). So the big annual rituals for me to keep my "competitive programmer" label were: fb hacker cup, google code jam, topcoder TCO, and advent of code. Now besides hacker cup, the rest are dead.

Sad. :(

Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time

#78
A little sad for me because I've enjoyed the global leaderboard aspect for years but of course my second reaction has to be to take a step back and appreciate all the joy that this one man has given us for all these years.

And he's made it clear from that start that he never intended the global leaderboard to be the point, plus AI the last few years messes it all up. All good things come to an end, and I gotta appreciate the good run that we had, and the voluntary work of one person that gifted it to us.

Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time

#79
post #71

Awesome! Yy usual 5-to-7-day output scramble will now look vastly more competent, ah, well, complete. Not actually be smarter, mind you, but radiate the comforting glow of effort by someone who has their temporal ducks in a suspiciously photogenic row. Improvement? No. But the illusion of improvement? Practically Nobel-worthy. I'm already enjoying this change.

I'm not sure how to parse all this, but I really appreciate the mental image of temporal ducks in a photogenic row. Sounds great for my Star Trek themed, very slow Sunday morning.

Been toiling with a new client, ingesting their documentation, and improving it with a Hitchhiker's Guide twist, so the next person needs less caffeine and weeps less.

It is bleeding into other aspects, but it's my pleasure to help with your Sunday morning imagery!

Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time

#80
post #17
post #5

Tryhards ruin everything, part n Make a fun little christmas calendar to bring joy to the people, get turned into a gamified warzone where people use AI and bots to try to get onto the global leaderboards - possibly because getting on them might net you a job at FAANG

The temptation to start a competative private leader board will be great, just for the mentioned reason. I have a reference my scores in my CV. The competative part of AoC is one of the things that I find attractive and also has taught me some valuable lessons about coding, like taking some time to review the code the first time before submitting. I experienced several times that I spend of time to debug a small bug…

I have created a private leaderboard which you can join with `1563228-d419ba6d.`

The basic rule is: you are only allowed to use code you wrote yourself. That does include code you wrote before the start of the contest, for example, standard functions you wrote for earlier AoC editions.

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