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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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Increible
Clever. Takes about 1400ms to run for 10000000 runs
Brilliant
Nice job. I always like to see a little recursion used when it can.
Very nice. the way of pushing element to the left and right. Love it:) Mine is complicated lol.
wow, so nice!
nice
The order of the three code statements is very important.GOOD JOB！But you may not notice all the details :
Note:
An empty array should be treated like a 0 in this problem.
In your case, if there is an empty array,the answer I think will be -1 rather than 0.