Open Labyrinth

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"So, the Labyrinth is a piece of cake, is it? Well, let's see how you deal with this little slice..."

Sarah: "You don't by any chance know the way through this labyrinth, do you?"
The Worm: "Who, me? No, I'm just a worm. Say, come inside, and meet the missus"

"Labyrinth" (1986)

The labyrinth has no walls, but bushes surround the path on each side. If a players move into a bush, they lose. The labyrinth is presented as a matrix (a list of lists): 1 is a bush and 0 is part of the path. The labyrinth's size is 12 x 12 and the outer cells are also bushes. Players start at cell (1,1). The exit is at cell (10,10). You need to find a route through the labyrinth. Players can move in only four directions--South (down [1,0]), North (up [-1,0]), East (right [0,1]), West (left [0, -1]). The route is described as a string consisting of different characters: "S"=South, "N"=North, "E"=East, and "W"=West.

Input: A labyrinth map as a list of lists with 1 and 0.

Output: The route as a string that contains "W", "E", "N" and "S".

Example:

```checkio([
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1],
[1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1],
[1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1],
[1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1],
[1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1],
[1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1],
[1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1],
[1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]])```

How it is used: This is a classical problem for path-finding in graphs -- Yes, the maze can be represented as a graph. It can be used in navigation software for a to b navigation and computer games for artificial intelligence. You can find your way anywhere you wish. Just divide a map into square cells and mark up the "bad" cells.

Precondition: Outer cells are pits.
len(labyrinth) == 12
all(len(row) == 12 for row in labyrinth)

45
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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.

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