Advent of Code 2020 🎄

AoC 2020 provided the perfect opportunity to try a new language, so I decided to use Kotlin.

I tried to make the code as clean and easy to read as possible, and I've also provided a short explanation to most solutions so that they're easier to understand.

Day	Puzzle	Solution	Results	Input	Text
01	Report Repair	Day 01 solution	Day 01 test	Day 01 input	Day 01 puzzle
02	Password Philosophy	Day 02 solution	Day 02 test	Day 02 input	Day 02 puzzle
03	Toboggan Trajectory	Day 03 solution	Day 03 test	Day 03 input	Day 03 puzzle
04	Passport Processing	Day 04 solution	Day 04 test	Day 04 input	Day 04 puzzle
05	Binary Boarding	Day 05 solution	Day 05 test	Day 05 input	Day 05 puzzle
06	Custom Customs	Day 06 solution	Day 06 test	Day 06 input	Day 06 puzzle
07	Handy Haversacks	Day 07 solution	Day 07 test	Day 07 input	Day 07 puzzle
08	Handheld Halting	Day 08 solution	Day 08 test	Day 08 input	Day 08 puzzle
09	Encoding Error	Day 09 solution	Day 09 test	Day 09 input	Day 09 puzzle
10	Adapter Array	Day 10 solution	Day 10 test	Day 10 input	Day 10 puzzle
11	Seating System	Day 11 solution	Day 11 test	Day 11 input	Day 11 puzzle
12	Rain Risk	Day 12 solution	Day 12 test	Day 12 input	Day 12 puzzle
13	Shuttle Search	Day 13 solution	Day 13 test	Day 13 input	Day 13 puzzle
14	Docking Data	Day 14 solution	Day 14 test	Day 14 input	Day 14 puzzle
15	Rambunctious Recitation	Day 15 solution	Day 15 test	Day 15 input	Day 15 puzzle
16	Ticket Translation	Day 16 solution	Day 16 test	Day 16 input	Day 16 puzzle
17	Conway Cubes	Day 17 solution	Day 17 test	Day 17 input	Day 17 puzzle
18	Operation Order	Day 18 solution	Day 18 test	Day 18 input	Day 18 puzzle
19	Monster Messages	Day 19 solution	Day 19 test	Day 19 input	Day 19 puzzle
20	Jurassic Jigsaw	Day 20 solution	Day 20 test	Day 20 input	Day 20 puzzle
21	Allergen Assessment	Day 21 solution	Day 21 test	Day 21 input	Day 21 puzzle
22	Crab Combat	Day 22 solution	Day 22 test	Day 22 input	Day 22 puzzle
23	Crab Cups	Day 23 solution	Day 23 test	Day 23 input	Day 23 puzzle
24	Lobby Layout	Day 24 solution	Day 24 test	Day 24 input	Day 24 puzzle
25	Combo Breaker	Day 25 solution	Day 25 test	Day 25 input	Day 25 puzzle

Structure

Solutions

The corresponding files for each solution are grouped within a dayXX package.

Each solution implements the GenericSolution interface and must implement the runPart1 and runPart2 methods which return the result as a string.

Tests and results

Each test extends the GenericSolutionTest class and must specify the expected results under expectedPart1Result and expectedPart2Result, which keeps the tests very clean.

Puzzles and inputs

The corresponding files for each puzzle are located within a dayXX folder.

Each folder contains:

• puzzle.txt: a dump of the puzzle text from the website, with the source link at the top
• input.txt: the puzzle input I received

Running

All solutions via tests

You can run all the tests using gradle:

./gradlew test

or if you're using Windows:

gradlew.bat test

Individual solutions via main

You can also take advantage of the functionality implemented in main.kt to run the puzzles individually:

./gradlew run --args='<day> <part>'

or if you're using Windows:

gradlew.bat run --args="<day> <part>"

replacing <day> with the puzzle's day number and <part> with either 1 or 2.

Results

Dashboard

Company Leaderboard