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Advent of Code 2021

All my Advent of Code repos:

 

This year it is back to roots - Python!

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

EDIT, November 2022: And I did - I've solved initial days in Racket too.

Solutions

Task Python Solution Racket Solution Comment for Python solution
Day 00: Helper file aoc.py aoc.rkt Utilities to use for solving the tasks.
Day 01: Sonar Sweep day01.py day01.rkt (a + b + c) < (b + c + d) --> a < d
Day 02: Dive! day02.py day02.rkt "Up, up, down, down, left, right, left, right..."
Day 03: Binary Diagnostic day03.py day03.rkt from collections import Counter
Day 04: Giant Squid day04.py day04.rkt Set operations (<=, -) to the rescue.
Day 05: Hydrothermal Venture day05.py day05.rkt TIL defaultdict is faster than Counter.
Day 06: Lanternfish day06.py day06.rkt Recursion with memoization.
Day 07: The Treachery of Whales day07.py day07.rkt Mean mean!
Day 08: Seven Segment Search day08.py day08.rkt Using Python 3.10 and pattern matching.
Day 09: Smoke Basin day09.py day09.rkt Recursive DFS.
Day 10: Syntax Scoring day10.py day10.rkt dict(zip(...)) for easier typing
Day 11: Dumbo Octopus day11.py day11.rkt Iterative DFS.
Day 12: Passage Pathing day12.py day12.rkt Recursive DFS generator with yield from.
Day 13: Transparent Origami day13.py day13.rkt Fold. Not fold.
Day 14: Extended Polymerization day14.py Counter to the rescue.
Day 15: Chiton day15.py Dijkstra.
Day 16: Packet Decoder day16.py iter for some elegant stream implementation.
Day 17: Trick Shot day17.py Analytical + brute force.
Day 18: Snailfish day18.py My first ever eval in 7 instances of AoC.
Day 19: Beacon Scanner day19.py
Day 20: Trench Map day20.py I had 9-neighbours helper ready.
Day 21: Dirac Dice day21.py Lanternfish says hi!
Day 22: Reactor Reboot day22.py
Day 23: Amphipod day23.py
Day 24: Arithmetic Logic Unit day24.py
Day 25: Sea Cucumber day25.py

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My solutions for AoC 2021

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python advent-of-code python3 advent adventofcode advent-of-code-2021 advent-of-code-2021-python

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