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)
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  • @kartoffelsaft@programming.dev
    1•1 year 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
      3•1 year 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•1 year 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?

      • AtegonOPM
        2•1 year 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