Advent of Code 2024

• Advent of Code 2024
  • Lang
  • Overview
  • Results!
    • Day 1: Historian Hysteria - Part 1
    • Day 1: Historian Hysteria - Part 2
    • Day 2: Red-Nosed Reports - Part 1
    • Day 2: Red-Nosed Reports - Part 2
    • Day 3: Mull It Over - Part 1
    • Day 3: Mull It Over - Part 2
    • Day 4: Ceres Search - Part 1
  • References
    • Java Streams
    • Java solutions to AoC 2022
    • Miscellaneous references and notes
  • Errata

Lang

This Advent of Code attempt is written in Java 23.0.1

Overview

Here's my attempt at the Advent of Code 2024. I'm using Java 23.0.1, IntelliJ IDEA 2024 & Copilot (only for language help and boilerplate)

Overall, the main approach is functional programming as much as possible; i.e. the Streams API and other language features. My idea was also to leverage Java 21+ features at every opportunity, such as the new switch expressions and pattern matching.

Results!

D:\Lib\jdk-23.0.1\bin\java.exe --enable-preview 
"-javaagent:C:\Users\Kings\AppData\Local\Programs\IntelliJ IDEA Ultimate\..." 
  -Dfile.encoding=UTF-8 
  -classpath C:\Users\Kings\Documents\Projects\AoC\2024\aoc2024\target\classes... 
  Main

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*** Advent of Code 2024 ***
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Day 1: Historian Hysteria - Part 1

https://adventofcode.com/2024/day/1

  Day 1 (part 1): Historian Hysteria  
  The answer is total distance = 1579939

Day 1: Historian Hysteria - Part 2

  Day 1 (part 2): Historian Hysteria  
  The answer is total similarity score = 20351745

---

Day 2: Red-Nosed Reports - Part 1

https://adventofcode.com/2024/day/2

  Day 2 (part 1): Red-Nosed Reports
  The answer is total safe reports = 356

Day 2: Red-Nosed Reports - Part 2

  Day 2 (part 2): Red-Nosed Reports
  The answer is total adjusted safe reports = 413

---

Day 3: Mull It Over - Part 1

https://adventofcode.com/2024/day/3

  Day 3 (part 1): Mull It Over
  The answer is total sum of multiplications = 169021493

Day 3: Mull It Over - Part 2

  Day 3 (part 2): Mull It Over
  The answer is total sum of enabled multiplications = 111762583

---

Day 4: Ceres Search - Part 1

https://adventofcode.com/2024/day/4

  Day 4 (part 1): Ceres Search
  The answer is total occurrences of word = 2358

---

References

This is a bunch of references mostly about functional programming and using Streams API in Java 21+

Java Streams

• https://medium.com/javarevisited/whats-new-with-java-23-698762aa44d1
• https://stackify.com/streams-guide-java-8/
• https://bell-sw.com/blog/a-guide-to-java-stream-api/
• https://www.happycoders.eu/java/stream-gatherers/

Java solutions to AoC 2022

• https://www.happycoders.eu/algorithms/advent-of-code-2022/

Miscellaneous references and notes

• Some window and groupby examples in Java, Python, R and Scala
  • https://spark.apache.org/docs/3.5.2/structured-streaming-programming-guide.html#basic-operations---selection-projection-aggregation
• Stuff from the vavr guy about the vavr package and functional programming in Java
  • https://www.youtube.com/watch?v=1OpAgZvYXLQ
  • https://docs.vavr.io/
  • https://gtrefs.github.io/code/functional-fizzbuzz/

Errata

There's a good chance I will not complete all the days, but what days I do complete I will also replicate in separate projects based on Python and Go. This is to compare similar approaches to the same problems with different languages.

EOF