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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. * * * * For installation and learning resources, refer to the [exercism help page](http://exercism.io/languages/ruby). For running the tests provided, you will need the Minitest gem. Open a terminal window and run the following command to install minitest: gem install minitest If you would like color output, you can `require 'minitest/pride'` in the test file, or note the alternative instruction, below, for running the test file. In order to run the test, you can run the test file from the exercise directory. For example, if the test suite is called `hello_world_test.rb`, you can run the following command: ruby hello_world_test.rb To include color from the command line: ruby -r minitest/pride hello_world_test.rb ## 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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102 entries across 102 versions & 1 rubygems