AdventOfCode2021
My solutions for AdventOfCode 2021 (by FluffyGameDev)
aoc2021
Advent of Code 2021 (by ednl)
AdventOfCode2021 | aoc2021 | |
---|---|---|
1 | 9 | |
0 | 1 | |
- | - | |
0.0 | 0.0 | |
over 2 years ago | 9 months ago | |
C++ | C | |
GNU General Public License v3.0 only | 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.
AdventOfCode2021
Posts with mentions or reviews of AdventOfCode2021.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2021-12-13.
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-🎄- 2021 Day 14 Solutions -🎄-
My C++ Solution
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
What are some alternatives?
When comparing AdventOfCode2021 and aoc2021 you can also consider the following projects:
AdventOfCode
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++)