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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 that case, you could try using a (circular) linked list in your solution.
It's not entirely clear what you're asking. It sounds like you may be asking if the winning army should return the index of its surviving soldiers in ascending order, but this wouldn't make sense if you're passing the sample tests.