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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.
Did you implement
void wave_sort(int arr[], int arr_size)
orvoid wave_sort(const std::vectro<int> &v)
? The tests have been rewritten a month ago to use the latter.