🎄 Advent of Code 2021 🎄

Summary

Advent of Code is an annual Advent calendar of programming puzzles. This year I am doing it in Python.

Running the code

To run the code of a specific day from the root directory run the following, replacing xx with the day number, 01 - 25. Make sure you use Python 3.9+.

python3 day_xx/main.py

You may want to replace python3 with python3.9 if the command above doesn't work.

To run the code of all days run the script:

./run_all.sh

Make sure you have given permission to execute (chmod +x run_all.sh).

Overview

Day	Name	Stars
01	Sonar Sweep	⭐⭐
02	Dive!	⭐⭐
03	Binary Diagnostic	⭐⭐
04	Giant Squid	⭐⭐
05	Hydrothermal Venture	⭐⭐
06	Lanternfish	⭐⭐
07	The Treachery of Whales	⭐⭐
08	Seven Segment Search	⭐⭐
09	Smoke Basin	⭐⭐
10	Syntax Scoring	⭐⭐
11	Dumbo Octopus	⭐⭐
12	Passage Pathing	⭐⭐
13	Transparent Origami	⭐⭐
14	Extended Polymerization	⭐⭐
15	Chiton	⭐⭐
16	Packet Decoder
17	Trick Shot	⭐⭐
18	Snailfish
19	Beacon Scanner
20	Trench Map	⭐⭐
21	Dirac Dice	⭐
22	Reactor Reboot	⭐
23	Amphipod
24	Arithmetic Logic Unit
25	Sea Cucumber	⭐

New Day

To generate the directory for the current day, save your browser cookie in a file called cookie.txt at the root level and run the new day script:

./new_day.sh

How to get your cookie

A session cookie is a small piece of data used to authenticate yourself to the Advent of Code web servers. It is not human-readable and might look something like this 53616c7465645f5fbd2d445187c5dc5463efb7020021c273c3d604b5946f9e87e2dc30b649f9b2235e8cd57632e415cb.

To learn more about authentication cookies check this Wikipedia article

To get your cookie, go to the Advent of Code website, and while logged in.

For Firefox: right and select "Inspect Element" and in the "Storage" tab select "Cookies" → "https://adventofcode.com"
For Chrome: right and select "Inspect" and in the "Application" tab select "Cookies" → "https://adventofcode.com"

Then find the row with "session" as name, copy the value and paste it in your newly created cookie.txt file

Linting

black . && isort . && flake8 --max-line-length=100