this post was submitted on 01 Dec 2023
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Day 5: If You Give A Seed A Fertilizer
https://adventofcode.com/2023/day/5
Leaderboard completion time: 26m37s, so it's the toughest problem this year so far.
I liked the slight trickiness of part 2, that the naive implementation would never complete in time.
As always doing a JQ implementation:
Part 1
Some comments:
input
first to get the seeds, theninputs
to get remaining lines.Part 2
Some comments:
[1,2,3] | [ .[] | if . == 2 then . * 10 + 1 , . * 10 + 2 else . end ]
->[1, 21, 22, 3]
Replaced less-than (and greater-than for symmetry) symbols with full-width version, since lemmy apparently doesn't handle them well within a code block: replacing less than with <
Part 2 is a classic AoC move, where suddenly the problem space becomes much larger.
JQ looks like magic. So short! So clean! What's the catch?
The main catch is it would often be faster to use a "real" programming langage ^^, both in writing the code, and in execution time for some loop heavy examples: equivalent code that completes say in 1 second in python, completing in 1 minute in jq. Also missing a way to call native libraries, to do stuff like say "md5" (relevant) in past years advents-of-code.
That being said i like the general "pipe", map-reduce feel of the language. Like bash one-liners It can make for very terse implementations. I like to add comments, and indentation to make it readable though.
Thanks for the insight!
I have to punt on part 2 for now, generally shitty day precludes fun coding.
Update done, nothing special
https://github.com/gustafe/aoc2023/blob/main/d05-If-You-Give-A-Seed-A-Fertilizer.pl