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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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The kata is great. However, if there are no matches, "None" is expected to return in C language, instead of "Empty". Please edit either the description or the test cases. Thx :D
The description should have said x1 < x2 or somewhat. If coders calculated in the reversed sequence, the answer will become x1 > x2, which cannot pass the tests.
The second option is to check if x1(coder) == x2(answer) and x2(coder) == x1(answer). If they are true, the tests should also be passed.