🎄 Advent of Code 🎄

My solutions in Kotlin

⭐️ Progress

Legend: ★: Both stars for that day • ☆: Just the first star

Year	1	2	3	4	5	6	7	8	9	1 0	1 1	1 2	1 3	1 4	1 5	1 6	1 7	1 8	1 9	2 0	2 1	2 2	2 3	2 4	2 5	★
2015	★️	★	★	★	★	★	★	★	★	★	★	★	★	★	★	★	★	★	☆	★						39
2016	☆	☆	★	★	★	★	★					★		★		★				★					☆	21
2017	★	★		★	★										★											10
2018	★	★	★		★																					8
2019	★	★		★																						6
2020	★	★	★	★	★	★	★	★	★	★	★	★	★	★	★	★	★		☆	☆	★	★	☆	★	☆	44
2021	★	★	★	★	★	★	★	★	★	★	★		★	★												26
2022	★	★	★	★	★	★	★	★	★	★	★	★	★								☆				☆	28
2023	★	★	★	★	☆	★	☆																			12
2024	★	★	★	★	★	★	★	★	★	★	★	★	★	★		☆	★	★	★	★		★			☆	40
2025	★	★	★	★	★	★	★	★	★	★	★	☆	–	–	–	–	–	–	–	–	–	–	–	–	–	23

🛷 How to run

Puzzles can be run using the Gradle run task or by executing the project's JAR file:

• All available puzzles (all years and days):
  ./gradlew run or java -jar build/libs/AdventOfCode.jar

• All puzzles for a given year:
  ./gradlew run --args 2020 or java -jar build/libs/AdventOfCode.jar 2020

• A single puzzle for a given year and day:
  ./gradlew run --args 2020/25 or java -jar build/libs/AdventOfCode.jar 2020/25

These arguments can be combined to run multiple puzzles, e.g. ./gradlew run --args "2015/1 2019 2020/6 2020/7" or java -jar build/libs/AdventOfCode.jar 2015/1 2019 2020/6 2020/7 will run the first puzzle from 2015, then all puzzles from 2019 and lastly the 6th and 7th puzzle from 2020.

Runtimes that exceed 15s are highlighted in red.

🐳 Docker

This project contains a Dockerfile to build the project and run the puzzles:

• To build the Docker image:
  docker build -t pfolta/advent-of-code:latest .

• To run all available puzzles (all years and days) in Docker (and remove the container afterwards):
  docker run --rm pfolta/advent-of-code:latest

• All puzzles for a given year:
  docker run --rm pfolta/advent-of-code:latest 2020

• A single puzzle for a given year and day:
  docker run --rm pfolta/advent-of-code:latest 2020/25

And just as when running the JAR archive natively, these arguments can be combined to run multiple puzzles, e.g. docker run --rm pfolta/advent-of-code:latest 2015/1 2019 2020/6 2020/7 will run the first puzzle from 2015, then all puzzles from 2019 and lastly the 6th and 7th puzzle from 2020.

🎅🏻 Structure

Legend: XXXX: Year (4 digits, e.g. 2020) • YY: Day (leading zero, e.g. 07) • ZZZZ: Puzzle name (UpperCamelCase, e.g. HandyHaversacks)

• Inputs go into src/main/resources/inputs and follow the naming convention yearXXXX/dayYY.txt
• Solutions go into src/main/kotlin/adventofcode and follow the naming convention yearXXXX/DayYYZZZZ.kt
• Solutions extend the Puzzle class and call its constructor passing an optional alternative input
• Solutions can have one or two parts sharing the same input. Not overriding fun partTwo(): Any will skip the second part when running the puzzle

🎁 Index

Year	Day	Puzzle	Links	⭐️ Part 1	⭐️ Part 2
2015	1	Not Quite Lisp	[Code] [Test]	232	1783
	2	I Was Told There Would Be No Math	[Code] [Test]	1598415	3812909
	3	Perfectly Spherical Houses in a Vacuum	[Code] [Test]	2565	2639
	4	The Ideal Stocking Stuffer	[Code] [Test]	282749	9962624
	5	Doesn't He Have Intern-Elves For This?	[Code] [Test]	238	69
	6	Probably a Fire Hazard	[Code] [Test]	377891	14110788
	7	Some Assembly Required	[Code]	16076	2797
	8	Matchsticks	[Code] [Test]	1333	2046
	9	All in a Single Night	[Code] [Test]	207	804
	10	Elves Look, Elves Say	[Code]	492982	6989950
	11	Corporate Policy	[Code] [Test]	vzbxxyzz	vzcaabcc
	12	JSAbacusFramework.io	[Code] [Test]	111754	65402
	13	Knights of the Dinner Table	[Code] [Test]	618	601
	14	Reindeer Olympics	[Code]	2696	1084
	15	Science for Hungry People	[Code] [Test]	21367368	1766400
	16	Aunt Sue	[Code]	213	323
	17	No Such Thing as Too Much	[Code] [Test]	1638	17
	18	Like a GIF For Your Yard	[Code]	768	781
	19	Medicine for Rudolph	[Code] [Test]	518
	20	Infinite Elves and Infinite Houses	[Code] [Test]	665280	705600
2016	3	Squares With Three Sides	[Code] [Test]	1050	1921
	4	Security Through Obscurity	[Code] [Test]	185371	984
	5	How About a Nice Game of Chess?	[Code] [Test]	801b56a7	424a0197
	6	Signals and Noise	[Code] [Test]	mshjnduc	apfeeebz
	7	Internet Protocol Version 7	[Code] [Test]	115	231
	12	Leonardo's Monorail	[Code] [Test]	318009	9227663
	14	One-Time Pad	[Code] [Test]	15035
	16	Dragon Checksum	[Code] [Test]	11111000111110000	10111100110110100
	20	Firewall Rules	[Code] [Test]	32259706	113
	25	Clock Signal	[Code]	158
2017	1	Inverse Captcha	[Code] [Test]	1047	982
	2	Corruption Checksum	[Code] [Test]	36766	261
	4	High-Entropy Passphrases	[Code] [Test]	466	251
	5	A Maze of Twisty Trampolines, All Alike	[Code] [Test]	372671	25608480
	15	Dueling Generators	[Code] [Test]	594	328
2018	1	Chronal Calibration	[Code] [Test]	522	73364
	2	Inventory Management System	[Code] [Test]	4693	pebjqsalrdnckzfihvtxysomg
	3	No Matter How You Slice It	[Code] [Test]	109143	506
	5	Alchemical Reduction	[Code] [Test]	11668	4652
2019	1	The Tyranny of the Rocket Equation	[Code]	3392373	5085699
	2	1202 Program Alarm	[Code]	3716250	6472
2020	1	Report Repair	[Code] [Test]	1005459	92643264
	2	Password Philosophy	[Code] [Test]	493	593
	3	Toboggan Trajectory	[Code] [Test]	280	4355551200
	4	Passport Processing	[Code] [Test]	216	150
	5	Binary Boarding	[Code] [Test]	842	617
	6	Custom Customs	[Code] [Test]	6530	3323
	7	Handy Haversacks	[Code] [Test]	213	38426
	8	Handheld Halting	[Code] [Test]	1939	2212
	9	Encoding Error	[Code]	1492208709	238243506
	10	Adapter Array	[Code] [Test]	2590	226775649501184
	11	Seating System	[Code] [Test]	2386	2091
	12	Rain Risk	[Code] [Test]	1533	25235
	13	Shuttle Search	[Code] [Test]	370	894954360381385
	14	Docking Data	[Code] [Test]	14862056079561	3296185383161
	15	Rambunctious Recitation	[Code] [Test]	206	955
	16	Ticket Translation	[Code] [Test]	22000	410460648673
	17	Conway Cubes	[Code] [Test]	362	1980
	19	Monster Messages	[Code] [Test]	151
	20	Jurassic Jigsaw	[Code] [Test]	68781323018729
	21	Allergen Assessment	[Code] [Test]	2078	lmcqt,kcddk,npxrdnd,cfb,ldkt,fqpt,jtfmtpd,tsch
	22	Crab Combat	[Code] [Test]	33434	31657
	23	Crab Cups	[Code] [Test]	97632548
	24	Lobby Layout	[Code] [Test]	269	3667
	25	Combo Breaker	[Code] [Test]	3286137
2021	1	Sonar Sweep	[Code] [Test]	1696	1737
	2	Dive!	[Code] [Test]	1762050	1855892637
	3	Binary Diagnostic	[Code] [Test]	2967914	7041258
	4	Giant Squid	[Code] [Test]	38913	16836
	5	Hydrothermal Venture	[Code] [Test]	3990	21305
	6	Lanternfish	[Code] [Test]	359999	1631647919273
	7	The Treachery of Whales	[Code] [Test]	328187	91257582
	8	Seven Segment Search	[Code] [Test]	288	940724
	9	Smoke Basin	[Code] [Test]	544	1017792
	10	Syntax Scoring	[Code] [Test]	319233	1118976874
	11	Dumbo Octopus	[Code] [Test]	1640	312
	13	Transparent Origami	[Code] [Test]	671	PCPHARKL
	14	Extended Polymerization	[Code] [Test]	2584	3816397135460
2022	1	Calorie Counting	[Code] [Test]	72240	210957
	2	Rock Paper Scissors	[Code] [Test]	12458	12683
	3	Rucksack Reorganization	[Code] [Test]	7878	2760
	4	Camp Cleanup	[Code] [Test]	599	928
	5	Supply Stacks	[Code] [Test]	JCMHLVGMG	LVMRWSSPZ
	6	Tuning Trouble	[Code] [Test]	1282	3513
	7	No Space Left On Device	[Code] [Test]	1084134	6183184
	8	Treetop Tree House	[Code] [Test]	1708	504000
	9	Rope Bridge	[Code] [Test]	6011	2419
	10	Cathode-Ray Tube	[Code] [Test]	14720	FZBPBFZF
	11	Monkey in the Middle	[Code] [Test]	50830	14399640002
	12	Hill Climbing Algorithm	[Code] [Test]	472	465
	13	Distress Signal	[Code] [Test]	5825	24477
	21	Monkey Math	[Code] [Test]	286698846151845
	25	Full of Hot Air	[Code] [Test]	2‑2=12=1‑=‑1=000=222
2023	1	Trebuchet?!	[Code] [Test]	55386	54824
	2	Cube Conundrum	[Code] [Test]	2285	77021
	3	Gear Ratios	[Code] [Test]	529618	77509019
	4	Scratchcards	[Code] [Test]	23847	8570000
	5	If You Give A Seed A Fertilizer	[Code] [Test]	462648396
	6	Wait For It	[Code] [Test]	2269432	35865985
	7	Camel Cards	[Code] [Test]	250474325
2024	1	Historian Hysteria	[Code] [Test]	1970720	17191599
	2	Red-Nosed Reports	[Code] [Test]	572	612
	3	Mull It Over	[Code] [Test]	174960292	56275602
	4	Ceres Search	[Code] [Test]	2483	1925
	5	Print Queue	[Code] [Test]	6498	5017
	6	Guard Gallivant	[Code] [Test]	5212	1767
	7	Bridge Repair	[Code] [Test]	8401132154762	95297119227552
	8	Resonant Collinearity	[Code] [Test]	252	839
	9	Disk Fragmenter	[Code] [Test]	6360094256423	6379677752410
	10	Hoof It	[Code] [Test]	746	1541
	11	Plutonian Pebbles	[Code] [Test]	194482	232454623677743
	12	Garden Groups	[Code] [Test]	1573474	966476
	13	Claw Contraption	[Code] [Test]	28138	108394825772874
	14	Restroom Redoubt	[Code] [Test]	224357412	7083
	16	Reindeer Maze	[Code] [Test]	98484
	17	Chronospatial Computer	[Code] [Test]	5,1,3,4,3,7,2,1,7	216584205979245
	18	RAM Run	[Code] [Test]	302	24,32
	19	Linen Layout	[Code] [Test]	267	796449099271652
	20	Race Condition	[Code] [Test]	1426	1000697
	22	Monkey Market	[Code] [Test]	20332089158	2191
	25	Code Chronicle	[Code] [Test]	3608
2025	1	Secret Entrance	[Code] [Test]	999	6099
	2	Gift Shop	[Code] [Test]	54234399924	70187097315
	3	Lobby	[Code] [Test]	17113	169709990062889
	4	Printing Department	[Code] [Test]	1411	8557
	5	Cafeteria	[Code] [Test]	601	367899984917516
	6	Trash Compactor	[Code] [Test]	5733696195703	10951882745757
	7	Laboratories	[Code] [Test]	1711	36706966158365
	8	Playground	[Code] [Test]	135169	302133440
	9	Movie Theater	[Code] [Test]	4777409595	1473551379
	10	Factory	[Code] [Test]	517	21469
	11	Reactor	[Code] [Test]	699	388893655378800
	12	Christmas Tree Farm	[Code]	524

🕯️ Useful commands

• Check formatting: ./gradlew ktlintCheck
• Fix formatting: ./gradlew ktlintFormat