Advent of Code

This repository contains my Advent of Code solutions. I have achieved all 300 stars that are currently available.

Blogs

• Wrapping up Advent of Code 2019 (2019/12/26)
• Catching Up on Advent of Code (2019/08/22)
• Thoughts on Advent of Code 2018 (2019/02/10)

Solutions

The solutions below are neither elegant, performant nor particularly interesting. They are "solve and forget", with little clean-up done afterwards to make the solutions more readable or efficient. I have completed them in C# using the wonderful LINQPad as my IDE.

• 2015
• 2016
• 2017
• 2018
• 2019
• 2020

2015

Day	C#
1: Not Quite Lisp	Part 1 Part 2
2: I Was Told There Would Be No Math	Part 1 Part 2
3: Perfectly Spherical Houses in a Vacuum	Part 1 Part 2
4: The Ideal Stocking Stuffer	Part 1 Part 2
5: Doesn't He Have Intern-Elves For This?	Part 1 Part 2
6: Probably a Fire Hazard	Part 1 Part 2
7: Some Assembly Required	Part 1 Part 2
8: Matchsticks	Part 1 Part 2
9: All in a Single Night	Parts 1 & 2
10: Elves Look, Elves Say	Parts 1 & 2
11: Corporate Policy	Parts 1 & 2
12: JSAbacusFramework(dot)io	Parts 1 & 2
13: Knights of the Dinner Table	Parts 1 & 2
14: Reindeer Olympics	Part 1 Part 2
15: Science for Hungry People	Parts 1 & 2
16: Aunt Sue	Part 1 Part 2
17: No Such Thing as Too Much	Part 1
18: Like a GIF For Your Yard	Part 1 Part 2
19: Medicine for Rudolph	Part 1 Part 2
20: Infinite Elves and Infinite Houses	Part 1 Part 2
21: RPG Simulator 20XX	Part 1 Part 2
22: Wizard Simulator 20XX	Part 1 Part 2
23: Opening the Turing Lock	Parts 1 & 2
24: It Hangs in the Balance	Part 1 Part 2
25: Let It Snow	Part 1

2016

Day	C#
1: No Time for a Taxicab	Part 1 Part 2
2: Bathroom Security	Part 1 Part 2
3: Squares With Three Sides	Part 1 Part 2
4: Security Through Obscurity	Part 1 Part 2
5: How About a Nice Game of Chess?	Part 1 Part 2
6: Signals and Noise	Parts 1 & 2
7: Internet Protocol Version 7	Parts 1 & 2
8: Two-Factor Authentication	Parts 1 & 2
9: Explosives in Cyberspace	Part 1 Part 2
10: Balance Bots	Parts 1 & 2
11: Radioisotope Thermoelectric Generators	Part 1 Part 2
12: Leonardo's Monorail	Parts 1 & 2
13: A Maze of Twisty Little Cubicles	Parts 1 & 2
14: One-Time Pad	Parts 1 & 2
15: Timing is Everything	Parts 1 & 2
16: Dragon Checksum	Parts 1 & 2
17: Two Steps Forward	Part 1 Part 2
18: Like a Rogue	Parts 1 & 2
19: An Elephant Named Joseph	Parts 1 & 2
20: Firewall Rules	Part 1 Part 2
21: Scrambled Letters and Hash	Parts 1 & 2
22: Grid Computing	Parts 1 & 2
23: Safe Cracking	Parts 1 & 2
24: Air Duct Spelunking	Parts 1 & 2
25: Clock Signal	Part 1

2017

Day	C#
1: Inverse Captcha	Part 1 Part 2
2: Corruption Checksum	Part 1 Part 2
3: Spiral Memory	Part 1 Part 2
4: High-Entropy Passphrases	Part 1 Part 2
5: A Maze of Twisty Trampolines, All Alike	Part 1 Part 2
6: Memory Reallocation	Part 1 Part 2
7: Recursive Circus	Parts 1 & 2
8: I Heard You Like Registers	Parts 1 & 2
9: Stream Processing	Parts 1 & 2
10: Knot Hash	Part 1 Part 2
11: Hex Ed	Parts 1 & 2
12: Digital Plumber	Part 1 Part 2
13: Packet Scanners	Parts 1 & 2
14: Disk Defragmentation	Part 1 Part 2
15: Dueling Generators	Part 1 Part 2
16: Permutation Promenade	Parts 1 & 2
17: Spinlock	Parts 1 & 2
18: Duet	Part 1 Part 2
19: A Series of Tubes	Parts 1 & 2
20: Particle Swarm	Parts 1 & 2
21: Fractal Art	Parts 1 & 2
22: Sporifica Virus	Part 1 Part 2
23: Coprocessor Conflagration	Part 1 Part 2
24: Electromagnetic Moat	Parts 1 & 2
25: The Halting Problem	Part 1

2018

Day	C#
1: Chronal Calibration	Part 1 Part 2
2: Inventory Management System	Part 1 Part 2
3: No Matter How You Slice It	Part 1 Part 2
4: Repose Record	Part 1 Part 2
5: Alchemical Reduction	Part 1 Part 2
6: Chronal Coordinates	Part 1 Part 2
7: The Sum of Its Parts	Part 1 Part 2
8: Memory Maneuver	Part 1 Part 2
9: Marble Mania	Part 1 Part 2
10: The Stars Align	Part 1 Part 2
11: Chronal Charge	Part 1 Part 2
12: Subterranean Sustainability	Part 1 Part 2
13: Mine Cart Madness	Part 1 Part 2
14: Chocolate Charts	Part 1 Part 2
15: Beverage Bandits	Part 1 Part 2
16: Chronal Classification	Part 1 Part 2
17: Reservoir Research	Part 1
18: Settlers of The North Pole	Part 1 Part 2
19: Go With The Flow	Part 1 Part 2
20: A Regular Map	Part 1
21: Chronal Conversion	Part 1
22: Mode Maze	Part 1 Part 2
23: Experimental Emergency Teleportation	Part 1 Part 2
24: Immune System Simulator 20XX	Part 1 Part 2
25: Four-Dimensional Adventure	Part 1

2019

Day	C#
1: The Tyranny of the Rocket Equation	Parts 1 & 2
2: 1202 Program Alarm	Parts 1 & 2
3: Crossed Wires	Parts 1 & 2
4: Secure Container	Parts 1 & 2
5: Sunny with a Chance of Asteroids	Parts 1 & 2
6: Universal Orbit Map	Parts 1 & 2
7: Amplification Circuit	Parts 1 & 2
8: Space Image Format	Parts 1 & 2
9: Sensor Boost	Parts 1 & 2
10: Monitoring Station	Parts 1 & 2
11: Space Police	Parts 1 & 2
12: The N-Body Problem	Parts 1 & 2
13: Care Package	Parts 1 & 2
14: Space Stoichiometry	Parts 1 & 2
15: Oxygen System	Parts 1 & 2
16: Flawed Frequency Transmission	Parts 1 & 2
17: Set and Forget	Parts 1 & 2
18: Many-Worlds Interpretation	Part 1 Part 2
19: Tractor Beam	Parts 1 & 2
20: Donut Maze	Part 1 Part 2
21: Springdroid Adventure	Parts 1 & 2
22: Slam Shuffle	Part 1 Part 2
23: Category Six	Parts 1 & 2
24: Planet of Discord	Part 1 Part 2
25: Cryostasis	Parts 1

2020

Day	C#
1: Report Repair	Parts 1 & 2
2: Password Philosophy	Parts 1 & 2
3: Toboggan Trajectory	Parts 1 & 2
4: Passport Processing	Part 1 Part 2
5: Binary Boarding	Parts 1 & 2
6: Custom Customs	Parts 1 & 2
7: Handy Haversacks	Parts 1 & 2
8: Handheld Halting	Parts 1 & 2
9: Encoding Error	Parts 1 & 2
10: Adapter Array	Parts 1 & 2
11: Seating System	Parts 1 & 2
12: Rain Risk	Parts 1 & 2
13: Shuttle Search	Parts 1 & 2
14: Docking Data	Parts 1 & 2
15: Rambunctious Recitation	Parts 1 & 2
16: Ticket Translation	Parts 1 & 2
17: Conway Cubes	Parts 1 & 2
18: Operation Order	Part 1 Part 2
19: Monster Messages	Parts 1 & 2
20: Jurassic Jigsaw	Parts 1 & 2
21: Allergen Assessment	Parts 1 & 2
22: Crab Combat	Parts 1 & 2
23: Crab Cups	Parts 1 & 2
24: Lobby Layout	Parts 1 & 2
25: Combo Breaker	Parts 1