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# Dominoes Make a chain of dominoes. Compute a way to order a given set of dominoes in such a way that they form a correct domino chain (the dots on one half of a stone match the dots on the neighbouring half of an adjacent stone) and that dots on the halfs of the stones which don't have a neighbour (the first and last stone) match each other. For example given the stones `21`, `23` and `13` you should compute something like `12 23 31` or `32 21 13` or `13 32 21` etc, where the first and last numbers are the same. For stones 12, 41 and 23 the resulting chain is not valid: 41 12 23's first and last numbers are not the same. 4 != 3 Some test cases may use duplicate stones in a chain solution, assume that multiple Domino sets are being used. ## Getting Started For installation and learning resources, refer to the [exercism help page](http://exercism.io/languages/haskell). ## Running the tests To run the test suite, execute the following command: ```bash stack test ``` #### If you get an error message like this... ``` 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... ``` 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: ```bash stack setup ``` ## Running *GHCi* If you want to play with your solution in GHCi, just run the command: ```bash stack ghci ``` ## Feedback, Issues, Pull Requests The [exercism/haskell](https://github.com/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.
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65 entries across 65 versions & 1 rubygems