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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.
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Actually yours and his solutions are O(n^2) so you can't say his solution is a much slower one.
But I like the way you search for palindromes in your solution tho!
If it says instead got: 1, your function returned 1. The log appears above the test result, so maybe you're confusing the input of one tests with the result of another:
The tests are ok.
Nota n issue of the kata (more than 14000 people passed it). Maybe a CW problem.