2021/

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Advent of Code 2021

Solutions to the 2021 Advent of Code.

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* means that a given day has a visualisation

Day	Status	Solutions	Notes
01 - Sonar Sweep	★ ★	Python, Go, Nim	Numbers and sliding windows.
02 - Dive!	★ ★	Python, Go	Have this set of instructions and do something sensible with it.
03 - Binary Diagnostic	★ ★	Python, Nim	Bit twiddling aplenty!
04 - Giant Squid	★ ★	Python	B-I-N-G-O, B-I-N-G-O, B-I-N-G-O and Bingo was his name-o!
05 - Hydrothermal Venture	★ ★	Python, Go, Nim	Pointy.
06 - Lanternfish	★ ★	Python	At this rate, the mass of the fish would surpass that of the Earth pretty quickly.
07 - The Treachery of Whales	★ ★	Python	I'm not 100% sure my solution for part two is valid for all possible inputs.
08 - Seven Segment Search	★ ★	Python, Go	I may have taken the easy way out for part two, but it does work! No-one ever said the smart solution is the best solution, anyway.
09 - Smoke Basin *	★ ★	Python	Schmokey! Also, as it turns out, I struggle to implement basic logic. Fun.
10 - Syntax Scoring	★ ★	Python	I can't say I've ever broken something so thoroughly that it has a syntax error on every line...
11 - Dumbo Octopus	★ ★	Python, Nim	Cellular automata my beloved <3
12 - Passage Pathing	★ ★	Go	I couldn't tell you how it works, but it does kinda work and I think I have a vague idea (external help was used).
13 - Transparent Origami	★ ★	Python, Nim	I got stuck for hours on an intermittent off-by-one error. :(
14 - Extended Polymerization	★ ★	Python	Another off-by-one error, but this time it was because of dodgy division. Wonderful.
15 - Chiton	★ ★	Python	Pathfinding is hard
16 - Packet Decoder	★ ★	Python	Parsing and interpreting stuff is surprisingly enjoyable
17 - Trick Shot	Unattempted
18 - Snailfish	Could not solve
19 - Beacon Scanner	Unattempted
20 - Trench Map *	★ ★	Python, Nim	Took a moment to realise that the infinite grid alternates between lit and unlit, and even then I had to look at someone else's solution to realise it.
21 - Dirac Dice	★ ☆	Python	Couldn't be bothered with part two - I've got too much going on at the moment to spend a lot of time thinking about it.
22 - Reactor Reboot	★ ★	Python, OpenSCAD and Blender	I did not expect to end up using 3D CAD software to complete AoC...
23 - Amphipod	Unattempted
24 - Arithmetic Logic Unit	Unattempted
25 - Sea Cucumber	★ ☆	Python	Missing some stars :(

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