I have returned to #AdventOfCode and still beating my head against the wall on #DayThreePartTwo in an interesting death spiral.

• Script a solution for the sample data
• Obtain microdose of dopamine
• Run it against the production data
• Watch it fail in new and interesting ways
• Try to repair the code
• Decide I either didn't really understand the problem or that my approach is making it harder than it should be
• Declare I'm an idiot
• Start over from scratch
• Go back to Step 1

I just finally managed to completed "Lobby" - Day 3/Part 2. #AdventOfCode https://adventofcode.com/2025/day/3

In this I did not see the trees – ehm – digits in the numbers. Over- and underthinking it for days.

https://codeberg.org/derheap/aoc-2025

I tried Gleam for Advent of Code

https://blog.tymscar.com/posts/gleamaoc2025/

#HackerNews #Gleam #AdventOfCode #CodingChallenge #Programming #BlogPost

# Advent of #markdown, day 10: Reference links

The links we all know and love are called inline links, but you can separate link text and destination when you use reference links. There are multiple types of course.

---

#adventofcode was pretty difficult today. It took me 4h30m, but I managed to write a solution myself with no libraries.

I've finally completed "Laboratories" - Day 7 - Advent of Code 2025 #AdventOfCode https://adventofcode.com/2025/day/7

Lessons learned: Don’t glimpse at other peoples solutions to early. On a hint I kept part 1 down to the splitters as data. Not keeping inbetween results. His hit me hart on part 2.

Lessons learned: Glimps on other peoples solutions. That let me the way.

https://codeberg.org/derheap/aoc-2025

Another meme for #AdventOfCode day 10

#AdventOfCode Day 10: Factory

Part 1 was easy, and I did it before breakfast.

But Part 2: Oh my! I tried to do it with combinatorics first, and it was too slow, even after countless optimizations. There is probably a dynamic programming way to do it, but dynamic programming is my nemesis.

I also figured early on that it was a linear systems problem, but linear algebra is ALSO my nemesis, so I avoided it at first. But since plan A didn’t work, I tried to solve the equations system myself in code with lots of Googling. But I eventually gave up and used a linear algebra package to do it for me (Google.OrTools.LinearSolver). Arghh...

#CSharp code is here:
https://github.com/nharrer/AdventOfCode/blob/main/dotnet/2025/Day10/Day10.cs

Puzzle:
https://adventofcode.com/2025/day/10

# Advent of #markdown, day 10: Reference links

The links we all know and love are called inline links, but you can separate link text and destination when you use reference links. There are multiple types of course.

---

#adventofcode was pretty difficult today. It took me 4h30m, but I managed to write a solution myself with no libraries.

I just posted a video of solving Advent of Code 2025 day 3 in elisp/common lisp simultaneously. #emacs #elisp #commonlisp #lisp #adventofcode #adventofcode2025

https://www.youtube.com/watch?v=7ZSjwo6ohrk

I just posted a video of solving Advent of Code 2025 day 3 in elisp/common lisp simultaneously. #emacs #elisp #commonlisp #lisp #adventofcode #adventofcode2025

https://www.youtube.com/watch?v=7ZSjwo6ohrk

I just completed "Lobby" - Day 3 - Advent of Code 2025 #AdventOfCode https://adventofcode.com/2025/day/3

🌟 It's time for #AdventOfCode! That means it's a great month to pick up a new programming language! Try it in Unison this year! 🎁
https://share.unison-lang.org/@unison/advent-of-code?utm_source=mastodon

I just completed "Gift Shop" - Day 2 - Advent of Code 2025 #AdventOfCode https://adventofcode.com/2025/day/2

I'll just go half the speed (given that we're on Day 4 already). This time I was more confident about my solution: got to a code, entered it and viola - the right one!

I finally completed "Gift Shop" - Day 2 - Advent of Code 2025 in #bash because I'm a fool. #AdventOfCode https://adventofcode.com/2025/day/2

Reminder: Please throttle your #AdventOfCode traffic

Please don't make frequent automated requests - avoid sending requests more often than once every 15 minutes (900 seconds).

https://www.reddit.com/r/adventofcode/comments/1pa472d/reminder_please_throttle_your_aoc_traffic/

I just completed "Lobby" - Day 3 - Advent of Code 2025 #AdventOfCode https://adventofcode.com/2025/day/3

I just completed "Secret Entrance" - Day 1 - Advent of Code 2025 #AdventOfCode https://adventofcode.com/2025/day/1

First time I'm participating 🎉 Feels good to finally have figured out the second part and now I also have to post this 😆

I've completed "Gift Shop" - Day 2 - Advent of Code 2025 #AdventOfCode https://adventofcode.com/2025/day/2 with #Elixir.

https://codeberg.org/derheap/aoc-2025