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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 will leak memory if buf is not freed
did you declare sum to be of type double for a reason?
I think for the bash case it may be worth mentioning standard unix tools.
Shouldn't the input/output types be
std::vector<int>
rather thanint[]
?