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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.
Get started now by creating a new collection.
Something is wrong with the test code for this kata.
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There's overflow happening in your solution, the tests are correct.
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I'm very confused by your code, but you seem to be missing a colon (:) at the ending of line 2.
The tester code is bugged and doesn't work for C, large random numbers cause integer overflow.
This is the problem I run into as well.