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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 code was checked number (prime) 11 004 979 in 30 000 nanoseconds
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Just a small remark: it is not necessary to add the String.valueOf in the return statement.
You have set max and min to ints[0], so you can start you second loop from 1 instead of 0.