Advent Of Code

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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

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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])
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console.log('Hello World')

founded 1 year ago

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Ategon@programming.dev

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❄️ - 2023 DAY 3 SOLUTIONS -❄️ (programming.dev)

submitted 11 months ago* (last edited 11 months ago) by Ategon@programming.dev to c/advent_of_code@programming.dev

31 comments fedilink hide all child comments

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)

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What is this?: Here is a post with a large amount of details: https://programming.dev/post/6637268
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[–] kartoffelsaft@programming.dev 1 points 11 months ago* (last edited 11 months ago) (2 children)

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 11 months ago (1 children)

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 11 months ago

Oh yeah, I misspoke, gonna edit.

[–] kartoffelsaft@programming.dev 1 points 11 months ago (1 children)

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 11 months 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