# The Square Chest

Elementary+

On the chest keypad is a grid of numbered dots. The grid is comprised of a square shaped array of dots and contains lines that connect some pairs of adjacent dots. The answer to the code is the number of squares that are formed by these lines. For example, in the figure shown below, there are 3 squares: 2 small squares and 1 medium square.

The dots are marked by the numbers 1 through 16. The endpoints of the lines are represented by lists of two numbers.

Input: A list of lines as a list of list. Each list consists of the two integers.

Output: The quantity of squares formed as an integer.

Example:

```checkio([[1, 2], [3, 4], [1, 5], [2, 6], [4, 8], [5, 6], [6, 7],
[7, 8], [6, 10], [7, 11], [8, 12], [10, 11],
[10, 14], [12, 16], [14, 15], [15, 16]]) == 3
checkio([[1, 2], [2, 3], [3, 4], [1, 5], [4, 8],
[6, 7], [5, 9], [6, 10], [7, 11], [8, 12],
[9, 13], [10, 11], [12, 16], [13, 14], [14, 15], [15, 16]]) == 2
```

How it is used: This is a simple puzzle that illustrates pattern searching. For complex cases you can improve your program and use it to search for more complex patterns, shapes and objects.

Precondition:
0 < len(lines) ≤ 32

45
Settings
Code:
Other:
Invalid hot key. Each hot key should be unique and valid
Hot keys:
•  to Run Code: to Check Solution: to Stop:
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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