# Visibilities

Simple+
English RU

You can solve the mission Boundary Blocks first, it can be a small useful part for this one.

This mission is an adaptation of the "Range" game (from Simon Tatham's Portable Puzzle Collection ). If you are lost or just want to play, the game is available here .

You're on a rectangular grid. Each numbered box corresponds to the number of empty cells in all four directions from it (but not diagonally), including itself. In order to satisfy these requirements, you have to arrange black boxes in empty cells to limit visibility.

• Two black boxes can't be neighbors horizontally or vertically.
• Black boxes can't separate white cells into several parts.

Empty boxes are represented by zeros.

Then, you have to return the coordinates of black boxes.

```Black boxes at (1, 2), (0, 0), (2, 3), (3, 4) and (2, 0).
[[0, 0, 4, 0, 6],
[0, 6, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 5, 0],
[6, 0, 7, 0, 0]]
```

Input: A list of lists of integers.

Output: An iterable of tuples/lists of two integers.

Example:

```list(visibilities([[0, 0, 4, 0, 6],
[0, 6, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 5, 0],
[6, 0, 7, 0, 0]])) == [(1, 2), (0, 0), (2, 3), (3, 4), (2, 0)]
```

To play the puzzles / tests yourself: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Preconditions:

• Given puzzles are solvable.
• 5 ≤ len(grid) ≤ 50 and 5 ≤ len(grid[0]) ≤ 50.
• all(len(row) == len(grid[0]) for row in grid).

49
Settings
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Hot keys:
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CheckiO Extensions

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`

`checkio --domain=py config --key=`

Sync solutions into your local folder

`checkio sync`

(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`
`checkio install-plugin --ff`
`checkio install-plugin --chromium`

Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.

Pair Programming (Beta-version)

Welcome to Pair Programming! Engage in real-time collaboration on coding projects by starting a session and sharing the provided unique URL with friends or colleagues. This feature is perfect for joint project development, debugging, or learning new skills together. Simply click 'Start Session' to begin your collaborative coding journey!

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