Advent of Code 2023

Solutions for the 2023 Advent of Code

Building

This project makes use of Go 1.19.

go mod download
go test ./...

Running the Solutions

To run a solution, use the problem name, which consists of the day number followed by a or b for the problem.

For example, to run problem 2a:

$ go run ./main.go 2 a
Answer: 9633
Took 999.4µs

If input.txt is not present in the folder for the specified day, or you want to use a different file, then you can specify it using the -i parameter. For example:

$ go run ./main.go 2 a -i challenge/day2/alternate_input.txt
Answer: 123
Took 464.3µs

Adding New Solutions

A generator program is included that makes templates for each day, automatically downloading challenge input and updating the root command to add new subcommands for each problem. Running go generate from the repo root will generate the following for each day that is currently accessible:

challenge/day<N>/import.go: A "glue" file combining commands for both of the day's problems to simplify wiring up subcommands
challenge/day<N>/a.go: The main problem implementation, containing a cobra command A and the implementation func a(*challenge.Input) int
challenge/day<N>/a_test.go: A basic test template
challenge/day<N>/input.txt: The challenge input

Additionally, challenge/cmd/cmd.go will be regenerated to import and add all subcommands.

This requires goimports be available on your $PATH. Additionally, you must be logged into https://adventofcode.com in your browser so the generator can use your session cookie to download challenge input.

Existing solutions and challenge inputs will be skipped instead of regenerated.

License

These solutions are licensed under the MIT License.

See LICENSE for details.

Attribution