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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Are the Java test cases really OK? I get the following error:
hamming(1692) should be 2147483648 expected:<-2147483648> but was:<2147483648>
Mathematically speaking, the product of three positive numbers cannot be negative so 2147483648 should be correct and not -2147483648, right? Could anyone check the test cases?