advent-of-code-2021
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advent-of-code-2021 | AdventOfCode2021 | |
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2 | 12 | |
2 | 1 | |
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5.1 | 2.6 | |
over 2 years ago | over 2 years ago | |
Rust | Perl | |
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advent-of-code-2021
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-🎄- 2021 Day 6 Solutions -🎄-
Yeah, I should've expected part 2 to have a ridiculous amount of fish... I went with a HashMap for saving how many fishes were at ages 0-8 each day. These are my favourite types of exercises, simple code and the solution is not immediately apparent. Cleanest code yet! GitHub
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-🎄- 2021 Day 5 Solutions -🎄-
Thought today's solution looked pretty clean. Regex for parsing the input, a HashMap for saving overlaps and a simple .scan() for generating the points.
AdventOfCode2021
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-🎄- 2021 Day 18 Solutions -🎄-
Full program on GitHub.
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-🎄- 2021 Day 15 Solutions -🎄-
Full program including code to deal with heaps, on GitHub.
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[2021 Day 11 (Part 2)] What input takes the most steps to synchronize?
Program I used for the above results
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-🎄- 2021 Day 8 Solutions -🎄-
See my solution on GitHub.
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Day 6 Proof of Correctness
Note also that you can solve this without a complexity dependency on n. Most solutions I have seen, including mine run in time O(tD), where t is the maximum value of a timer, and D the number of generation, requiring O(t) memory. (This is assuming we can do the required arithmetic operations in constant time, and each numbers require a fixed around of memory storage; if the number of fish gets huge, throw in an additional log n in the complexities, where n is the number of fish on the final day).
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-🎄- 2021 Day 6 Solutions -🎄-
Based on my matrix exponentiation solution, here is a closed-form solution:
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How do I read today's input ? Part 1
In my Perl solution of today (I assume, you mean 2021, Day 4), I read stuff in paragraph mode ($/ = "") which makes Perl split input on 2 or more newlines.
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2021 Day #4 (Part 1) [Native Python ONLY] - Conceptual Guidance?
I considered doing that for my (Perl) solution, but given the cards are small, that seemed overkill.
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-🎄- 2021 Day 4 Solutions -🎄-
Python implementation on GitHub
What are some alternatives?
advent-of-code-2022 - My solutions to AoC 2022. I don't claim any of them to be particularly pretty, especially since I'm using it as an excuse to learn Rust.
Elixir - Elixir is a dynamic, functional language for building scalable and maintainable applications
Advent-of-Code - Advent of Code
Advent-of-code - My solutions of adventofcode.com
adventofcode - adventofcode.com solutions
Advent_of_Code_2021_Solutions_Java - Personal AoC/2021 Solutions in Java
adventofcode - Solutions for problems from AdventOfCode.com
adventofcode - Advent of Code solutions of 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 and 2023 in Scala
AdventOfCode - My Advent of Code solutions. I also upload videos of my solves: https://www.youtube.com/channel/UCuWLIm0l4sDpEe28t41WITA
adventofcode - Advent of Code challenge solutions
AoC - my personal repo for the advent of code yearly challenge