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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.
This comment is hidden because it contains spoiler information about the solution
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What a brilliant !
Ohh, i've readed it several times
You need to read the description.
i can't understand the pattern
why this [0, 0, 0, 1] ==> 1
why this [1, 1, 1, 1] ==> 15
is there is math formula i need to know or what happens here xD ?
Not a kata issue, and there is no test with that input. Print the input to help you debug your code.
this testcase('same chars') returns True in my local return False can some on help