Day 3: Gear Ratios

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)
Code block support is not fully rolled out yet but likely will be in the middle of the event. Try to share solutions as both code blocks and using something such as https://topaz.github.io/paste/ or pastebin (code blocks to future proof it for when 0.19 comes out and since code blocks currently function in some apps and some instances as well if they are running a 0.19 beta)

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

🔒This post will be unlocked when there is a decent amount of submissions on the leaderboard to avoid cheating for top spots

🔓 Edit: Post has been unlocked after 11 minutes

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

[-] kartoffelsaft@programming.dev 1 points 2 years ago* (last edited 2 years ago)

Did this in Odin

Here's a tip: if you are using a language / standard library that doesn't have a set, you can mimic it with a map from your key to a nullary (in this case an empty struct)

formatted code

package day3

import "core:fmt"
import "core:strings"
import "core:unicode"
import "core:strconv"

flood_get_num :: proc(s: string, i: int) -> (parsed: int, pos: int) {
    if !unicode.is_digit(rune(s[i])) do return -99999, -1

    pos = strings.last_index_proc(s[:i+1], proc(r:rune)->bool{return !unicode.is_digit(r)})
    pos += 1

    ok: bool
    parsed, ok = strconv.parse_int(s[pos:])

    return parsed, pos
}

p1 :: proc(input: []string) {
    // wow what a gnarly type
    foundNumSet := make(map[[2]int]struct{})
    defer delete(foundNumSet)

    total := 0

    for y in 0..

[-] sjmulder@lemmy.sdf.org 3 points 2 years ago

Here’s a tip: if you are using a language / standard library that doesn’t have a map,

Probably meant to write 'a set'? Good trick though.

[-] kartoffelsaft@programming.dev 1 points 2 years ago

Oh yeah, I misspoke, gonna edit.

[-] kartoffelsaft@programming.dev 1 points 2 years ago

hmm, my code keeps getting truncated at for y in .., anyone have any idea why? Maybe the "<" right after that confuses a parser somewhere?

[-] Ategon@programming.dev 2 points 2 years ago

Lemmy doesn't handle certain characters well currently such as left angle brackets and ampersands due to some sanitization in the back end to stop scripting attacks

this post was submitted on 03 Dec 2023

20 points (95.5% liked)

Advent Of Code

1243 readers

1 users here now

An unofficial home for the advent of code community on programming.dev! Other challenges are also welcome!

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.

Everybody Codes is another collection of programming puzzles with seasonal events.

EC 2025

AoC 2025

Solution Threads

M	T	W	T	F	S	S
1	2	3	4	5	6	7
8	9	10	11	12

Visualisations Megathread

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. [2024 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 3 years ago

MODERATORS

Ategon@programming.dev

Sigmatics@lemmy.ca

CameronDev@programming.dev

hades@programming.dev