Day 19: Aplenty

Megathread guidelines

Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever)
You can send code in code blocks by using three backticks, the code, and then three backticks or use something such as https://topaz.github.io/paste/ if you prefer sending it through a URL

FAQ

What is this?: Here is a post with a large amount of details: https://programming.dev/post/6637268
Where do I participate?: https://adventofcode.com/
Is there a leaderboard for the community?: We have a programming.dev leaderboard with the info on how to join in this post: https://programming.dev/post/6631465

you are viewing a single comment's thread
view the rest of the comments

[-] sjmulder 2 points 8 months ago

That's a nice parser and I like the use of pattern matching here.

What I wonder is if you couldn't make a cool monadic representation of the ranges, where you could do the equivalent of

if (foo.x > 12)
    return bar(x);
else
    return baz(x);

but 'x' wouldn't be an integer, it'd be a collection of integer ranges. The > operator would return a collection of pairs of (newly split) integer ranges and booleans. The if would yield map the pairs to a new bunch of pairs and so on.

[-] lwhjp 2 points 8 months ago

Mmm, I was thinking something similar. I've been meaning to go back and have another go, but the last few problems have eaten up all my time (and energy!)

I realized with the parser you can write eg

    rule = (,) <$> optionMaybe (try condition) <*> many1 letter

which avoids even more of those pesky variable names! (I still haven't quite internalized how to use Applicative)

this post was submitted on 19 Dec 2023

6 points (100.0% liked)

Advent Of Code

736 readers

1 users here now

An unofficial home for the advent of code community on programming.dev!

Advent of Code is an annual Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.

AoC 2023

Solution Threads

M	T	W	T	F	S	S
				1	2	3
4	5	6	7	8	9	10
11	12	13	14	15	16	17
18	19	20	21	22	23	24
25

Rules/Guidelines

Follow the programming.dev instance rules
Keep all content related to advent of code in some way
If what youre posting relates to a day, put in brackets the year and then day number in front of the post title (e.g. [2023 Day 10])
When an event is running, keep solutions in the solution megathread to avoid the community getting spammed with posts

Relevant Communities

Relevant Links

Advent of Code Homepage

Credits

Icon base by Lorc under CC BY 3.0 with modifications to add a gradient

console.log('Hello World')

founded 1 year ago

MODERATORS

Ategon@programming.dev

Sigmatics@lemmy.ca

CameronDev@programming.dev