-🎄- 2021 Day 20 Solutions -🎄-

• adventofcode

  59 6 8.5 Julia

  Advent of Code challenge solutions (by flwyd)

Raku and Go 10828/10559 (because I spent about 40 hours thinking that 3D rotation is commutative across axes, until I did a second round of experimenting with a Rubik's cube). The Raku solution runs in about 41 minutes, the Go solution runs in about 41 seconds.

• aoc2021

  19 15 0.0 Python

  Advent of Code 2021 (Elixir + Pygame) (by p88h)

Elixir 3 ms / 1.3 sec

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• advent-of-code

  23 20 9.1 Rust

Compile for your CPU. By default rustc compiles for a generic CPU (i.e. a very very old x64), so the compiler does not use all the features availabl ein modern processors. Just add this in your project and you'll get several % improvement.

• aoc

  22 1 9.0 Raku

  Advent of Code - mscha's Perl 6 solutions (by mscha)

The rest is the same as my first attempt, but full code at GitHub.

• advent-of-code

  34 29 5.6 Python

  Advent of Code (by morgoth1145)

Python3 64/44

• Advent-of-Code

  9 11 7.9 Rust

  A repository holding all of my solutions to Advent of Code problems (by Noble-Mushtak)

Python 3.8.10 82/68

• AdventOfCode

  26 324 8.0 Python

  My Advent of Code solutions. I also upload videos of my solves: https://www.youtube.com/channel/UCuWLIm0l4sDpEe28t41WITA

135/99. Python. Video coming soon.

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• advent-of-code-2021

  1 0 3.7 Rust

RUST

• advent-of-code

  29 16 9.1 JavaScript

  Advent of Code solutions in JS (by leyanlo)

• adventofcode

  12 3 8.0 Java

  My solutions for Advent of Code (by fireduck64)

• advent_2021

  1 0 0.0 Python

Python using numba for speed, so part 2 runs in about 200 ms. Kind of nasty that the example code didn't flash...

• AdventOfCode_2021

  3 1 0.0 Rust

  Repository for Advent of Code 2021 solutions (by galenelias)

Code

• aoc2021

  5 0 5.1 Clojure

  Advent of Code 2021 solutions in Clojure and Python (by tabidots)

Clojure (Github). Part 2 runs in ~4.2s (didn't try to optimize anything, if there is even anything to optimize).

• AdventOfCode2021

  2 2 4.1 Python

Pidgin Python... didn't get the trick filler value in the first place, nasty little Hobbits :( https://github.com/Myxcil/AdventOfCode2021/blob/main/Day20/day20_main.py

• deno_aoc

  21 5 0.0 TypeScript

  🎄 Advent of code solutions written in TypeScript for Deno.

• advent_of_code

  11 4 9.3 Perl

• advent-of-code-2021

  2 1 0.0 Python

  My solutions for Advent of Code 2021: https://adventofcode.com/2021 (by BradonZhang)

Python 2295/2001 - GitHub

• AdventOfCode-Java

  21 50 8.8 HTML

  adventOfCode(Language.JAVA);

• aoc-2021-python

  1 0 0.0 Python

  my Python solutions for Advent of Code 2021!

Kudos! I tried to do the exact same thing in Python, but I was much slower even with the help of the standard library's functools.cache. (Python, 1680/1482.)

• AdventOfCode2021

  16 0 0.0 C#

• adventofcode

  718 65 9.0 Scala

  Advent of Code solutions of 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 and 2023 in Scala (by sim642)

My Scala solution.

• Advent_of_Code2021

  12 1 0.0 R

  Solutions to Advent of COde 2021 (by cettt)

Today was quite easy again. The only challenging part in my input was that light pixels surrounded by only light pixels turn dark (and vice versa). github

• Advent

  1 2 8.4 C#

  AdventOfCode (by genveir)

C#

• AoC2021

  1 0 0.0 Python

• advent2021

  7 0 0.0 Java

  Advent of Code 2021 (by arjanIng)

• AdventOfCode

  5 2 7.7 C#

C# solution (cleaned up)

• AoC

  1 0 5.9 C++

  AoC by me (by Alenlov)

Python

• aoc

  5 3 0.0 Rust

rust part 1 and 2, since only number of steps were different

• adventofcode

  22 17 9.0 JavaScript

  ES6 solutions to Advent of Code puzzles. (by surgi1)

both parts (a bit ugly brute force in the "let's expand the range into oblivion until it works" parts)

• aoc_kotlin

  8 1 8.6 Kotlin

  Advent of code solutions in Kotlin

Kotlin 1948/1806

• AOC

  2 0 7.3 Kotlin

  Advent of code (by cascer1)

github link

• AdventOfCodeCSharp

  30 7 8.0 C#

  My AoC Solutions

C#

• AdventOfCode

  2 0 7.5 Python

Python

• advent-of-code

  14 1 0.0 Common Lisp

Python.

• advent-of-code-2021

  16 0 5.1 Rust

  Discontinued Code I used for solving https://adventofcode.com/2021 (by pavel1269)

• adventofcode-21

  4 0 3.6 Elixir

Elixir

• advent-of-code

  1 2 2.6 Ruby

  My solutions for advent of code (by klaustopher)

Ruby

• advent-of-code

  12 1 7.4 Common Lisp

  In Common Lisp (by brunal)

• advent-of-code

  44 23 8.5 C++

• AdventOfCode2021

  2 0 6.3 Python

Python 3 using Numpy: https://github.com/HeyHouBenjo/AdventOfCode2021/blob/main/20/20.py

• adventOfCode

  3 13 9.0 Python

  Advent of Code solutions in a number of different languages (by codemicro)

• advent-of-code-solutions

  14 0 6.9 JavaScript

  My JS solutions for https://adventofcode.com/ (by AugustsK)

• advent2021

  6 0 0.0 Python

• advent-of-code

  10 3 8.2 JavaScript

  My Advent of Code solutions through the years - mostly JS (by davidsharp)

Almost walked away from this when caught out by the "empty" space flipping. But stuck with it and managed to make it work without changing my approach too much.

• AdventOfCode2021

  4 0 0.0 Python

Code

• Advent-of-Code

  1 10 0.0 Rust

  Solutions for Advent of Code ⭐️ (by kvrhdn)

Solution in Go: kvrhdn/Advent-of-Code//advent-of-code-2021/day20/day20.go

• advent-of-code-2021

  16 3 0.0 Zig

  zig solutions to advent of code 2021 (by jchevertonwynne)

• AoC2021

  14 0 0.0 Swift

  Advent of Code 2021 (by gereons)

• AdventOfCode2021

  25 3 1.8 Jupyter Notebook

  Advent of code 2021 (by marcodelmastro)

• Advent-of-Code

  42 9 8.6 Python

  Advent of Code (by michaeljgallagher)

Nice problem today

• aoc_bp

  3 0 0.0 JavaScript

  My AOC boilerplate

JavaScript with some optimizations

• adventofcode2021

  1 1 0.0 Kotlin

  Advent of Code 2022 (by GoossensMichael)

Kotlin

• advent-of-code

  25 5 8.0 Scala

  My solutions to the Advent of Code (by aaronreidsmith)

Scala. Really enjoyed today's puzzle. A classic Game of Life with a little twist

• aoc2021

  23 3 0.0 Slash

  Advent of Code 2021 on my homemade 16-bit CPU SCAMP (by jes)

• AoC2021

  1 0 0.0 Python

github

• adventofcode

  55 20 7.8 Elixir

  Advent of code solutions (by mathsaey)

• advent-of-code

  10 1 4.6 Python

  My Advent of Code submissions (by DecemberDream)

Python day 20, code for part 1 also worked for part 2 without any changes.

• aoc2021-abap

  3 1 1.9 ABAP

  Discontinued AdventOfCode 2021 solutions in ABAP

I've created solutions for all days except day 19 in ABAP. Feel free to take a look at the whole repository. The code is standalone and doesn't require any DDIC types or classes. Just a local file on the application server to read the input from.

• AoC

  2 0 0.0 C#

C#

• advent-2021

  19 5 6.8 Rust

  Discontinued [Moved to: https://github.com/Crazytieguy/advent-of-code] (by Crazytieguy)

• adventofcode

  2 0 8.2 Python

  Advent of Code solutions (by alchemyst)

Python + SciPy

• advent-of-code

  8 1 8.5 C#

  My Advent of Code solutions (by premun)

• advent-of-code-2021

  2 0 0.0 Haskell

Haskell: https://github.com/MaT1g3R/advent-of-code-2021/blob/master/day20/src/Lib.hs

• adventofcode

  86 16 7.3 TypeScript

  Solutions for problems from AdventOfCode.com (by bhosale-ajay)

TypeScript, simple solution.

• advent-of-code

  15 0 0.0 Common Lisp

  Advent of code solutions (by tallbikeguy)

• advent-of-code-2021

  5 0 0.0 Java

  Advent of Code 2021 Solutions (by jerchende)

I used my Matrix Implementaion, which was usefull in seven puzzles until now :).

• aoc2021

  14 0 3.6 Java

• aoc2021

  2 0 3.6 Zig

  advent of coding zig (by Kiraffi)

Writing in Zig, seems to get around 1.7ms run time for combined part 1 and 2. Not exactly pretty code, and I feel like there has to be better way to do stuff. https://github.com/Kiraffi/aoc2021/blob/main/src/day20.zig

• advent_of_code

  13 0 8.3 Perl

  Advent of Code solutions (by domm)

• adventofcode2021

  4 1 0.0 Python

  My Solution to AOC2021 (by HrRodan)

Python: 28 lines and a rather good performance by using numpy, a bool array, and generic filter from ndimage. The generic filter again felt a little bit like cheating :) https://github.com/HrRodan/adventofcode2021/blob/master/day20/day20.py

• aoc

  16 3 0.0 JavaScript

  Advent of Code Solutions (by joeyemerson)

• advent-of-code

  1 2 8.9 C#

  Advent of Code solutions by me (by Corniel)

Full code at Github

• adventofcode2021

  8 2 0.0 OCaml

• advent-of-code

  8 1 5.6 JavaScript

  Watch me give up half way through >_> (by gabts)

• aoc2021

  32 26 0.0 Kotlin

  Advent of Code 2021 - my answers

Haskell 621/603

• AdventOfCode2021FSharp

  17 5 0.0 Jupyter Notebook

  Solutions for Advent of Code 2021 in F#

F# solution in Jupyter Notebook. Part 1 takes 500ms but Part 2 takes 24s. Any suggestions on where performance could be improved would be appreciated!

• Advent-of-Code-2021

  1 0 0.0 Rust

  My solution for the advent of code 2021, mainly written in Rust (by tmokenc)

Rust

• AdventOfCode

  29 2 7.7 Python

  Hacky solutions for [Advent of Code](https://adventofcode.com), working on past problems (by AllanTaylor314)

The state of a pixel after 1 step depends on the 3x3 grid around it; The state after 2 steps depends on the 5x5 grid around it etc. (Which is how I initially solved part 1) The state after n steps depends on the (2*n+1)^2 pixels around it. This means that the farthest affected pixels are n pixels away from the initial edge i.e. a 100x100 image enhanced 50 times creates an image that is 200*200 (increased by 50 lines on each of the four sides). Anything outside that range is assumed to be empty after all the steps have been applied (Which is true for any input and number of steps where the answer is finite).

• advent-of-code-2021

  12 6 0.0 Python

  All solutions for the 2021 Advent of Code event. (by Bruception)

• AdventOfCode

  16 5 8.2 Nim

  Advent of Code Solutions (by auxym)

• advent-of-code-2021

  3 2 0.0 Go

  My Advent of Code solutions. I prioritize readability over performance where possible. (by tcc-sejohnson)

• BenchmarkDotNet

  67 10,056 9.2 C#

  Powerful .NET library for benchmarking

  

Maybe you can create a benchmarking project where you test both the C# and F# algorithm using benchmarkdotnet?

• aoc2021

  3 0 0.0 Nim

Day 20

• adventofcode

  18 1 1.8 Go

  https://adventofcode.com/2021/ (by Torakushi)

• aoc20

  1 0 1.0 Go

• AdventOfCode2021

  18 1 0.0 C++

• advent-of-code-go

  63 152 3.0 Go

  All 8 years of adventofcode.com solutions in Go/Golang; 2015 2016 2017 2018 2019 2020 2021 2022

• AdventOfCode2021

  19 11 4.2 C++

  My solutions to https://adventofcode.com/2021 (by willkill07)

• adventofcode

  1 0 0.0 Python

  my solutions to adventofcode.com (by simeydk)

If you're interested, I did a similar thing, also using Numpy, but tried to use numpy's vector methods rather than loops Solution to 2021 Day 20 in Python (using Numpy)

• aoc-2021-in-kotlin

  14 1 1.8 Kotlin

• Advent-of-code-2021

  16 5 4.5 Python

  Discontinued [Moved to: https://github.com/Toanuvo/Advent-of-code] (by Toanuvo)

• advent-of-code-2021

  1 0 0.0 Jupyter Notebook

Code here.

• AdventOfCode2021.jl

  28 17 6.6 Julia

  Advent of Code 2021 in Julia

• advent-of-code-2021-kotlin

  3 3 3.6 Kotlin

  🎄 Solutions to Advent of Code 2021 in Kotlin 💜

Kotlin code - Notes

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