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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.
I think your previous solution was more efficient, this one keesp repeatedly searching the lowerbound, the prior compared as interleaving
This is the way, I would only change a few minor things
Bello !
You're absolutely right, but the original one explicitly excluded std::merge :)