`1` ```exercism fetch haskell go-counting ```

# Go Counting

Count the scored points on a Go board.

In the game of go (also known as baduk, igo, cờ vây and wéiqí) points are gained by completely encircling empty intersections with your stones. The encircled intersections of a player are known as its territory.

Write a function that determines the territory of each player. You may assume that any stones that have been stranded in enemy territory have already been taken off the board.

Multiple empty intersections may be encircled at once and for encircling only horizontal and vertical neighbours count. In the following diagram the stones which matter are marked "O" and the stones that don't are marked "I" (ignored). Empty spaces represent empty intersections.

 ```1 2 3 4 5 6``` ```+----+ |IOOI| |O O| |O OI| |IOI | +----+ ```

To be more precise an empty intersection is part of a player's territory if all of its neighbours are either stones of that player or empty intersections that are part of that player's territory.

## Hints

To complete this exercise, you need to implement the following functions:

• `territories` returns the coordinates (1 based, top left is (1,1)) of the points in each territory along with who "owns" the territory.

• `territoriesFor` returns the territory that contains the coordinate along with the owner of the territory. If the coordinate does not point to an empty location, returns Nothing.

A territory is owned by one of the players if that player's stones are the only stones adjacent to the territory.

You will find the type signatures already in place, but it is up to you to define the functions.

## Getting Started

For installation and learning resources, refer to the exercism help page.

## Running the tests

To run the test suite, execute the following command:

 `1` ```stack test ```

#### If you get an error message like this...

 `1` ```No .cabal file found in directory ```

You are probably running an old stack version and need to upgrade it.

#### Otherwise, if you get an error message like this...

 ```1 2``` ```No compiler found, expected minor version match with... Try running "stack setup" to install the correct GHC... ```

Just do as it says and it will download and install the correct compiler version:

 `1` ```stack setup ```

## Running GHCi

If you want to play with your solution in GHCi, just run the command:

 `1` ```stack ghci ```

## Feedback, Issues, Pull Requests

The exercism/haskell repository on GitHub is the home for all of the Haskell exercises.

If you have feedback about an exercise, or want to help implementing a new one, head over there and create an issue. We'll do our best to help you!

## Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.