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2.0yr
11

CannotSleep420 in programming

Is there interest in daily Advent of Code threads for December?

For anyone who doesn't know, advent of code is a series of coding challenges that happens every year. It's made to be like an advent calendar, with one programming challenge released per day until Christmas. Something interesting about this is that since the challenges only need the output of the program, you can do it in any language you want. I thought it might be interesting to compare and discuss solutions (ideally spoilered in case anyone hasn't completed the challenge yet).

Thoughts?

loathsome dongeater - 2.0yr

I would be interested if the problems would be framed with all the exposition smit santas and gnomes and elves removed because I find it confusing. I don't want anyone to waste their precious effort on that though lol.

3
FuckBigTech347 - 2.0yr

Seems fun I'd love to give it a shot. I'd suggest though that we should do our own variant (if people are interested). Reason being that adventofcode.com requires people to identify themselves with 1 of 4 Imperial big tech websites (Github, Google, Twitter, Reddit) and skipping this step doesn't seem to be an option.

3
CannotSleep420 - 2.0yr

I can see why privacy would be an issue, although I'm not sure I'd be able to come up with a bunch of interesting code challenges for our own variant.

3
☭ 𝗚𝗿𝗮𝗶𝗻𝗘𝗮𝘁𝗲𝗿 ☭ - 2.0yr

if it's just text (I can't check since it blocks Tor access), you can include it in your daily posts so we can avoid the site

3
albigu - 2.0yr

Sounds fun, I'll probably participate when I have the time.

2
loathsome dongeater - 2.0yr

@CannotSleep420@lemmygrad.ml Can you share your input and the answer for part 2? I can't find the bug in my program.

1
CannotSleep420 - 2.0yr

I haven't solved it yet.

2
CannotSleep420 - 2.0yr

I'm making progress, but I tend to be a perfectionist with these sorts of things.

2
loathsome dongeater - 2.0yr

My solution for day 1:

::: spoiler golang

import (
	"bufio"
	"fmt"
	"os"
	"strings"
)

func check(e error) {
	if e != nil {
		panic(e)
	}
}

// Part 1
func parseLinePartOne(line string) int {
	var first, last int
	foundFirst := false
	for i := 0; i < len(line); i++ {
		if line[i] >= '0' && line[i] <= '9' {
			if !foundFirst {
				first = int(line[i] - '0')
				foundFirst = true
			}
			last = int(line[i] - '0')
		}
	}
	return first*10 + last
}

// Part 2
func stringToDigit(str string) (int, bool) {
	digits := map[string]int{
		"one":   1,
		"two":   2,
		"three": 3,
		"four":  4,
		"five":  5,
		"six":   6,
		"seven": 7,
		"eight": 8,
		"nine":  9,
	}
	if str[0] >= '0' && str[0] <= '9' {
		return int(str[0] - '0'), true
	}
	for k, v := range digits {
		if strings.HasPrefix(str, k) {
			return v, true
		}
	}
	return 0, false
}

func parseLinePartTwo(line string) int {
	first, last := 0, 0
	for i := 0; i < len(line); i++ {
		n, ok := stringToDigit(line[i:])
		if ok {
			first = n
			break
		}
	}
	for i := len(line) - 1; i >= 0; i-- {
		n, ok := stringToDigit(line[i:])
		if ok {
			last = n
			break
		}
	}
	return first*10 + last
}

func main() {
	file, err := os.Open("./input.txt")
	check(err)
	defer file.Close()

	scanner := bufio.NewScanner(file)
	partOne, partTwo := 0, 0
	for scanner.Scan() {
		line := scanner.Text()
		partOne += parseLinePartOne(line)
		partTwo += parseLinePartTwo(line)
	}
	check(scanner.Err())
	fmt.Println("Part 1:", partOne)
	fmt.Println("Part 2:", partTwo)
}

:::

1