🎄 Advent Of Code 🎄

2021

🎅 === Advent of Code 2021 === 🎅

🎄 --- Day 01: Sonar Sweep ---
  🌟 Part 1: 1581  (13.3ms)
  🌟 Part 2: 1618  (2.62ms)
  
🎄 --- Day 2: Dive! ---
  🌟 Part 1: 2117664     (12.6ms)
  🌟 Part 2: 2073416724  (3.14ms)
  
🎄 --- Day 3: Binary Diagnostic ---
  🌟 Part 1: 1082324  (7.91ms)
  🌟 Part 2: 1353024  (2.42ms)
  
🎄 --- Day 4: Giant Squid ---
  🌟 Part 1: 58374  (40ms)
  🌟 Part 2: 11377  (12.4ms)
    
🎄 --- Day 5: Hydrothermal Venture ---
  🌟 Part 1: 6113   (60.0ms)
  🌟 Part 2: 20373  (50.1ms)
  
🎄 --- Day 6: Lanternfish ---
  🌟 Part 1: 351188         (27.9ms)
  🌟 Part 2: 1595779846729  (2.00ms)
  
🎄 --- Day 7: The Treachery of Whales ---
  🌟 Part 1: 341534    (22.8ms)
  🌟 Part 2: 93397707  (29.8ms)

🎄 --- Day 8: Seven Segment Search ---
  🌟 Part 1: 539      (1.93ms)
  🌟 Part 2: 1084606  (6.55ms)
  
🎄 ---- Day 9: Smoke Basin ---
  🌟 Part 1: 537      (9.4ms)
  🌟 Part 2: 1142757  (9.9ms)
  
🎄 ---- Day 10: Syntax Scoring ---
  🌟 Part 1: 367227      (3.85ms)
  🌟 Part 2: 3583341858  (2.00ms)

🎄 ---- Day 11: Dumbo Octopus ---
  🌟 Part 1: 1661  (14.9ms)
  🌟 Part 2: 334   (13.2ms)
  
🎄 ---- Day 12: Passage Pathing ---
  🌟 Part 1: 4749    (13.4ms)
  🌟 Part 2: 123054  (95.3ms)
  
🎄 ---- Day 13: Transparent Origami ---
  🌟 Part 1: 602       (3.88ms)
  🌟 Part 2: CAFJHZCK  (6.80us)
  
🎄 ---- Day 14: Extended Polymerization ---
  🌟 Part 1: 2549           (16.7ms)
  🌟 Part 2: 2516901104210  (5.54ms)
  
🎄 ---- Day 15: Chiton ---
  🌟 Part 1: 523   (53.7ms)
  🌟 Part 2: 2876  (1.44s)

🎄 ---- Day 16: Packet Decoder ---
  🌟 Part 1: 1014           (7.50us)
  🌟 Part 2: 1922490999789  (1.70us)
  
🎄 ---- Day 17: Trick Shot ---
  🌟 Part 1: 23005  (1.19ms)
  🌟 Part 2: 2040   (3.10us)

🎄 ---- Day 18: Snailfish ---
  🌟 Part 1: 1946  (43.2ms)
  🌟 Part 2: 3825  (358ms)

🎄 ---- Day 19: Beacon Scanner ---
  🌟 Part 1: 479    (458us)
  🌟 Part 2: 13113  (41.0ms)

🎄 ---- Day 20: Trench Map ---
  🌟 Part 1: 4928   (31.6ms)
  🌟 Part 2: 16605  (402ms)

🎄 ---- Day 21: Dirac Dice ---
  🌟 Part 1: 913560           (920us)
  🌟 Part 2: 110271560863819  (2.74s)

🎄 ---- Day 22: Reactor Reboot ---
  🌟 Part 1: 581108            (658ms)
  🌟 Part 2: 1325473814582641  (29.7ms)
  
🎄 ---- Day 23: Amphipod ---
  🌟 Part 1: 19019  (561ms)
  🌟 Part 2: 47533  (556ms)  
  
🎄 ---- Day 24: Arithmetic Logic Unit ---
  🌟 Part 1: 99691891979938  (104ms)
  🌟 Part 2: 27141191213911  (658ms)  
  
🎄 ---- Day 25: Sea Cucumber ---
  🌟 Part 1: 305  (201ms) 
  🌟 Part 2: 
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                 '.____)  (5.80us)

Visualizations

I just discovered p5js, so this year I will try to create some animations about the input I get from AOC.

See: visualizations.

Screenshots

I gather screenshots at each step (most of) of each years, so that I can make videos about the AOC filling up during december.

See: screenshots.

Goal

After the 6 last years with Java, Go (finished with Java), OCaml (finished with Java), Python and Clojure (+ some Java), Kotlin, this year I'll be solving the Advent of Code with Kotlin again.

1. A deep dive into Kotlin.
2. Write fast and idiomatic solutions.
3. Using extensions to make code shorter (see Extensions.kt).

I am gradually rewriting all previous years solutions in Kotlin because it's a better language for such challenges than the other I used before (except Python, but I'm not doing so much Python so just forgetting how to write some basic stuff).

All years

2021

2020

2019

2018

2017

2016

2015

Project is already setup with gradle. To run the app:

• Navigate to top-level directory on the command line
• Run ./gradlew run to run all days for all years
• Run ./gradlew run --args $DAY to run a specific day in the current year (2021, ex: ./gradlew run --args 8 to run the day 8 of 2021)
• Run ./gradlew run --args $YEAR/* to run all days in a specific year (ex: ./gradlew run --args 2015/* to run the year 2015)
• Run ./gradlew run --args $YEAR/$DAY to run a specific year & day (ex: ./gradlew run --args 2015/7 to run the day 7 of 2015)
• Run ./gradlew run --args input-$DAY to download the input for a specific day for the current year, provided a cookie.txt file in src/main/resources.txt which contains your Advent of Code cookie (ex: ./gradlew run --args input-6 to run the day 6 of 2021)
• Run ./gradlew run --args input-$YEAR/$DAY to download the input for a specific day in a specific year, provided a cookie.txt file in src/main/resources.txt which contains your Advent of Code cookie (ex: ./gradlew run --args input-2015/7 to run the day 7 of 2015)

Testing

• Navigate to top-level directory on the command line
• Run ./gradlew test
• Add --info, --debug or --stacktrace flags for more output

Test input

By default, instantiations of Day classes in tests will use the input files in src/test/resources, not those in src/main/resources. This hopefully gives you flexibility - you could either just copy the real input into src/test/resources if you want to test the actual answers, or you could add a file of test data based on the examples given on the Advent of Code description for the day. The stub Day01Test class shows a test of the functionality of Day01 where the test input differs from the actual input.

Architecture

• Inputs go into src/main/resources and follow the naming convention X.txt where X is like 01, 02 and so on
• Solutions go into src/main/kotlin/days and extend the Day abstract class, calling its constructor with their day number
• Solutions follow the naming convention DayX
• It is assumed all solutions will have two parts but share the same input
• Input is exposed in the solution classes in two forms - inputList and inputString
• Day 1 solution class and input file are stubbed as a guide on how to extend the project, and how you can use the inputList and inputString mentioned above
• To get started simply replace src/main/01.txt with the real input and the solutions in Day01 with your own
• A Day 1 test class also exists, mostly to show a few hamcrest matchers, and how test input files can differ from actual ones (see Test input section above). To get started with testing you can edit this class, and the input file at src/test/resources/01.txt