Day 12 solution thread

# advent-of-code

[adamratzman]

Day 12 solution thread

[adamratzman]

The waypoint rotation got me for a while

[andyb]

Solved by simple fold over the Instructions using a different data class for Part1 & Part2
Most complicated bit was turning the waypoint in Part 2

Day12 Solution

[ephemient]

https://github.com/ephemient/aoc2020/blob/main/kt/src/main/kotlin/io/github/ephemient/aoc2020/Day12.kt eh, turning the waypoint in part 2 is the exact same code as turning the direction in part 1

[ephemient]

I should probably share more code between parts 1 and 2 - the only difference is whether N/E/S/W affect the position or the direction/waypoint - may do that later

[Edgars]

@ephemient It's the same for me as well. Just realized R and L are the same operations in both parts. But for now, my solution looks like this: https://github.com/edgars-supe/advent-of-code/blob/master/src/main/kotlin/lv/esupe/aoc/year2020/Day12.kt

[ephemient]

unified now. instead of doing anything fancy by dispatching moves by polymorphism, I just split it out with

private fun solve(waypoints: Boolean): Int
 fun part1(): Int = solve(false)
fun part2(): Int = solve(true)

[Jakub Gwóźdź]

finally the opportunity to use operators overloading 🙂

[renatomrcosta]

Ever since someone asked me if my code was satire I was a bit ashamed of posting here, but I’m decently proud of my code today: https://github.com/renatomrcosta/adventofcode/blob/main/src/main/kotlin/aoc2020/day12/pt2/day12.kt

[Jakub Gwóźdź]

Never be ashamed of your AoC code. We're doing it for fun and to learn something. You're going in the right direction, and even if your code is still a bit... uh... baroque 🙂, there is nothing wrong from being proud of it 🙂

[Nir]

@renatomrcosta I'm sorry, that was me, that wasn't my intention.

[Nir]

IT was, believe it or not, asked in good faith, but since it's too hard to genuinely communicate that over this medium, I should have kept it to myself

[Nir]

My solution. Did a fair bit more of modelling of the data compared to previous days, I think it helps keep repetition to a minimum later though:

[Nir]

Untitled

[renatomrcosta]

Don't worry @Nir no harm, no foul. Btw, your day 10 was exquisite, really dope solution

[Nir]

Aww thanks, that's too kind. Btw, your solution for today is very good! Took a quick skim.

[renatomrcosta]

like I said, first time in 12 days I’m proud haha. Even a broken clock is right twice a day

[renatomrcosta]

fingers crossed the streak keeps up

[renatomrcosta]

(honestly, since then I’ve been streamlining a lot, and it has really helped a ton. So the feedback was invaluable, after all)

[Nir]

Yeah I did not mean it in a negative way. I know it's common for programmers esp from Java to be trained/used to this school of thought where classes, inheritance, etc are used super heavily, but also common for people to make jokes about it. I do think this code is nice because it's using objects and such but in a reasonable way; it looks like reasonable code scaled down to a toy problem. To me personally, the previous code felt over the top a bit in that "Java" sense, but again I did not mean to antagonize or discourage you, especially never the latter. Glad you are still posting your solutions, you should

[bjonnh]

https://github.com/bjonnh/advent_of_code/blob/master/src/main/kotlin/y2020/day12/main.kt

[bjonnh]

I'm simplifying it (like south is always north(-value))

[bjonnh]

kind of the same for left and right

[bjonnh]

oh I see a typo

[bjonnh]

(my floor mod had 360 instead of 4

[bjonnh]

it was still working by chance because all the rotations were given in a nice range