If you have solved the "How to find friends" mission, then you already know how to check for the existence of a path in graphs. Let's try to add something more to that problem.
You are given a matrix (2D array) and the coordinates (row and column) of two cells with the same value. The matrix consists of digits. You may move to neighbouring cells either horizontally or vertically provided the values of the origin and destination cells are equal. You should determine if a path exists between two given cells.
A matrix is represented as a tuple of tuples with digits. Coordinates are represented as a tuple with two numbers: ...
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CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin --ff
checkio install-plugin --chromium