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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.
Hmmm.... depends... You can check on compiler explorer the 'optimized' diff between the per char code and the 'std::accumulate'one ...
You're right though, never allocate more than required..
Great explanation right there.
That's much better!