For a given day n, create a folder src/days/<n> with the following files:

• input.txt containing your user-specific puzzle input
• parse.ts which has a default export of the type (input: string) => T where T is any type which makes the input easier to work with e.g. number[]
• a.ts which has a default export of the type (input: T) => string | number where T is the type returned by the parse function and the return value is the result for the first puzzle of the day
• b.ts which is the same as b.ts but for the second puzzle of the day

The parse.ts file is optional. If omitted, the functions exported by a.ts and b.ts will be passed the original input as a string.

You may create any other helper files in the day's folder as necessary, including *.test.ts files.

To run tests, use yarn test.

To run a particular puzzle, use yarn solve [<n>[<a|b>]] e.g. yarn solve 1a. If arguments are omitted, the latest available will be used based on what folders/files exist. The solution will be printed to the console and copied to the clipboard.