Advent of Code 2021

All my Advent of Code repos:

• AoC 2015 in Nim, Python
• AoC 2016 in Python
• AoC 2017 in Nim, OCaml, Python
• AoC 2018 in Nim, Python, Racket
• AoC 2019 in OCaml, Python
• AoC 2020 in Nim, one liner-y Python
• AoC 2021 in Python (this repo)

 

This year it is back to roots - Python!

I'll probably add solutions in other languages on some later date.

Solutions

Task	Python Solution	Comment
Day 01: Sonar Sweep	day01.py	(a + b + c) < (b + c + d) --> a < d
Day 02: Dive!	day02.py	"Up, up, down, down, left, right, left, right..."
Day 03: Binary Diagnostic	day03.py	from collections import Counter
Day 04: Giant Squid	day04.py	Set operations (<=, -) to the rescue.
Day 05: Hydrothermal Venture	day05.py	TIL defaultdict is faster than Counter.
Day 06: Lanternfish	day06.py	Recursion with memoization.
Day 07: The Treachery of Whales	day07.py	Mean mean!
Day 08: Seven Segment Search	day08.py	Using Python 3.10 and pattern matching.
Day 09	day09.py
Day 10	day10.py
Day 11	day11.py
Day 12	day12.py
Day 13	day13.py
Day 14	day14.py
Day 15	day15.py
Day 16	day16.py
Day 17	day17.py
Day 18	day18.py
Day 19	day19.py
Day 20	day20.py
Day 21	day21.py
Day 22	day22.py
Day 23	day23.py
Day 24	day24.py
Day 25	day25.py