Scala Advent of Code 2024

Solutions in Scala for the annual Advent of Code (adventofcode.com) challenge.

Note: this repo is not affiliated with Advent of Code.

See earlier editions:

• 2021
• 2022
• 2023

Website

The Scala Advent of Code website contains:

• some explanation of our solutions to Advent of Code
• more solutions from the community

Setup

We use Visual Studio Code with Metals to write Scala code, and scala-cli to compile and run it.

You can follow these steps to set up your environement.

How to open in Visual Studio Code

After you clone the repository, open a terminal and run:

$ cd scala-advent-of-code
$ scala-cli setup-ide 2024
$ mkdir 2024/input
$ code 2024

code 2024 will open Visual Studio Code and start Metals. If not you may have to go to the Metals pane and click the button labelled "Start Metals".

When you navigate to a file, e.g. 2024/src/day01.scala metals should index the project, and then display code lenses above each of the main methods part1 and part2, as shown in this image:

To run a solution, first copy your input to the folder 2024/input. Then click run in VS Code which will run the code and display the results of the program. Or debug, which will let you pause on breakpoints, and execute expressions in the debug console.

How to run a solution with command line

To run a solution, first copy your input to the folder 2024/input.

In a terminal you can run:

$ scala-cli 2024 -M day01.part1
Compiling project (Scala 3.x.y, JVM)
Compiled project (Scala 3.x.y, JVM)
The solution is 64929

Or, to run another solution:

$ scala-cli 2024 -M <dayX>.<partX>

Contributing

• Please do not commit your puzzle inputs, we can not accept them as they are protected by copyright