aoc2021
Advent of Code 2021 (by ednl)
Advent_of_Code_2021
My solutions to Advent of Code 2021 (by neelakantankk)
Our great sponsors
aoc2021 | Advent_of_Code_2021 | |
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9 | 11 | |
1 | 0 | |
- | - | |
0.0 | 0.0 | |
9 months ago | over 2 years ago | |
C | Python | |
MIT License | - |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
aoc2021
Posts with mentions or reviews of aoc2021.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2022-09-18.
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[2021 day 6] What's you're fastest solution?
This in C runs in 215 us on a Pi 4 with the cpu in performance mode: https://github.com/ednl/aoc2021/blob/main/day06.c
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[DAY 6] C# solution with commentary
I took a few hints from the solutions thread and made this in C which executes in 0.4 milliseconds on a Raspberry Pi 4: https://github.com/ednl/aoc2021/blob/main/day06.c
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[2021 Day 18] [C++] Overcomplicated solution after a lot of grief and hair loss.
Good outcome. I'm not well versed in C++ so I can't say much about it. For my solution in C, I figured that a full-blown tree was too much work and also not really needed if I kept track of the level myself, because everything is always in the same order left to right, just expanding and contracting. So I used a linked list and a SF number became an array of SF digits where each digit is a struct { left,right,level,value }. I guess the trickiest bit was to do the accountancy of keeping everything linked correctly when exploding and splitting.
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[2021] What did you learn or take away from AoC 2021?
The constant time thing is counting fish in an age histogram mod 9, right? I think that idea floated around the solution thread. I am no longer sure if I saw it there first or came up with it myself..... but here's my implementation in C: https://github.com/ednl/aoc2021/blob/main/day06.c
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-🎄- 2021 Day 14 Solutions -🎄-
Added lots of comments as explanation of the ideas and the code: https://github.com/ednl/aoc2021/blob/main/day14.c
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-🎄- 2021 Day 6 Solutions -🎄-
Good ol' C code. Very simple program once you think of making a circular buffer from the population histogram by age bins, and simulating every day. I got stuck for a while trying to come up with a direct mathematical function which never gave me the exact number. The crux:
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-🎄- 2021 Day 4 Solutions -🎄-
C, which takes some bookkeeping but it can be fast. I didn't push for every last drop of speed but still: about 3 ms on a Raspberry Pi 4 (1.8 GHz overclock, Buster desktop, not very quiet so I picked a good run). Code with lots of comments
Advent_of_Code_2021
Posts with mentions or reviews of Advent_of_Code_2021.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2021-12-14.
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-🎄- 2021 Day 15 Solutions -🎄-
Python solution. Part 1 runs in no time at all. Part 2 takes about 1.2 s which, I think, is because I am creating the entire 500x500 grid at the beginning. I suspect that I could speed it up considerably by only creating a grid in a direction when I get there, maybe create the next tile to the right and down when I get to a tile. A tile update function would probably not be too difficult as each cost would be an (x,y) multiple of the cost's base (x,y). I'm going to attempt to bring this to below 1s. :D
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-🎄- 2021 Day 14 Solutions -🎄-
Python
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-🎄- 2021 Day 13 Solutions -🎄-
My solution in Python. Part 1 was pretty easy to do with sets. For Part 2, I just printed to console and put in the letters. :D
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-🎄- 2021 Day 11 Solutions -🎄-
Surprised at the pretty small input file size :D but pretty easy Python solution using dicts, lists, and sets. Python comprehensions just make life so much easier.
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-🎄- 2021 Day 9 Solutions -🎄-
Finally managed to solve Part 02 in Python. I was stuck because I could not figure out a way to go through all the points around a low point till I got to a 9. Then yesterday I say u/skarlso's post about Red Blob games and the various pathing algorithms, and the breadth-first-search example just unblocked the whole solution for me. :)
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-🎄- 2021 Day 6 Solutions -🎄-
Python solution that takes about a second for part 2. The logic is the same for both parts, just changed the number of days it runs for.
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-🎄- 2021 Day 5 Solutions -🎄-
Bless Python's sets! Makes checking for membership such a breeze!
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-🎄- 2021 Day 4 Solutions -🎄-
Python
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-🎄- 2021 Day 3 Solutions -🎄-
Pretty easy with Python. Some list comprehension, some count, some join, some int and it's done. Could be more efficient, of course. 😁
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-🎄- 2021 Day 2 Solutions -🎄-
Simple Python-based solution yet again.
What are some alternatives?
When comparing aoc2021 and Advent_of_Code_2021 you can also consider the following projects:
AdventOfCode
Advent-of-code-2021-golang - Advent of code 2021 Go solutions
aoc-2021 - Advent of code 2021 challenges written in Rust to learn the language and get more comfortable with the it (and sometimes I just use C++)
adventofcode - My solutions to the Advent of Code challenges
aoc2021rust
advent_of_code - My solutions to advent of code puzzles
AOC2021
adventofcode
AoC2021 - Advent of Code 2021 in GO
AdventOfCode
advent-of-code
advent-of-code - Advent of Code solutions
aoc2021 vs AdventOfCode
Advent_of_Code_2021 vs Advent-of-code-2021-golang
aoc2021 vs aoc-2021
Advent_of_Code_2021 vs adventofcode
Advent_of_Code_2021 vs aoc2021rust
Advent_of_Code_2021 vs advent_of_code
Advent_of_Code_2021 vs AOC2021
Advent_of_Code_2021 vs adventofcode
Advent_of_Code_2021 vs AoC2021
Advent_of_Code_2021 vs AdventOfCode
Advent_of_Code_2021 vs advent-of-code
Advent_of_Code_2021 vs advent-of-code