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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.
In fact your solution takes ~2800 ms to pass 121 tests and fail 62. So I'm astonished that things are going well on your PC; if it were the case you should have the same result here. You must try understand why your are getting so "-1" instead of correct results. Print the input to see what happens.
Good night, sorry for bothering, this is my first KATA. I have solved the problem and passed all the test cases shown, but when I run Attempt, it fails on many -1 results (It takes about 2000ms, so guess i'm good on that side). The thing is that running the same code on my PC gives -1 as a result for each of those numbers that failed on the Attempt, and I have no idea of what may be the problem, as i'm not changing anything.