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# scratchcards

This folder contains a Logtalk solution for the Advent of Code 2023 Day 4
problem:

https://adventofcode.com/2023/day/4

The `test_files` directory contain sample inputs for part 1 of the problem
copied from the problem description. For copyright reasons, the part 2 files
cannot be distributed here and **must** be downloaded from the Advent of Code
2023 website.

Print Logtalk, Prolog backend, and kernel versions (if running as a notebook):

```logtalk
%versions
```

Start by loading the example:

```logtalk
logtalk_load(scratchcards(loader)).
```

Compute the points for the `test_files/sample` file (part 1):

```logtalk
object_property(scratchcards, file(_, Directory)),
atom_concat(Directory, 'test_files/sample', File),
scratchcards::points(File, Points).
```

<!--
Points = 13.
-->

Compute the total number of scratchcards for the `test_files/input` file
(part 2):

```logtalk
object_property(scratchcards, file(_, Directory)),
atom_concat(Directory, 'test_files/input', File),
scratchcards::total(File, Total).
```

<!--
Total = 6874754.
-->
