adventofcode-21 VS advent-of-code

Email: [email protected]

Some code at: https://github.com/ciju (i.e https://github.com/ciju/adventofcode-21 )

Few things I have written about:

https://ciju.in/posts/understanding-timezones (in progress)

Elixir

Elixir (github). About 4s on my laptop.

Python. Part a is whatever, part 2 is pretty clean. I wonder if there's a math-only solution to this?

Python.

Python. Brute force with a tiny bit of pruning, takes about 3 minutes. I've been thinking of switching from CL for days and having the chance to use matrix multiplications finally gave me a great reason to :)

Common Lisp Truly ugly day, took me about 4 hours for part 1 and submitted more than 24h past the puzzle for the first :(

Common Lisp. Very disappointing problem since you can just brute force over even unreasonable bounds quickly. Would have been more appropriate as a day 4 or 5 problem

Common Lisp. Christ this was a sad day. I probably had part 1 in 40 minutes (or I would have if emacs didn't start hanging which necessitated a huge apt-get update/apt-get upgrade 40 minutes in), but then I got hung up until ~3hrs by the "padding" stuff and trying to parse more than one root-level packet from the string. Uggghhh.

Simple Dijkstra's in Common Lisp, though I can think of a good heuristic to use with A*. Took me like 10 minute to find a priority queue lib I liked, and about another 15 to figure out I needed to initialize it with a predicate of #'< instead of #'= :/

Common Lisp. Pretty bad day, stumbled around for like an hour trying to actually construct the strings for part B and then finished in like 10 mins once I realized how to take the better approach :/

Common Lisp. Pretty ugly, I could have merged fold-left and fold-up and the printing logic leaves something to be desired

Common Lisp. Got bit really hard twice today, on part a by not knowing that equalp compares strings case-insensitively (wtf!?) and on part b by speedreading and thinking that all small caves could be revisited on a single path