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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.
any actual explanation ?
In short, most_common doesn't get as good results as direct list generator.
compare with
Alright, remove is extreme stupidity.
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yep, but just python or other languages with built-in tools.
I should use upper_bound instead of lower_bound, so that it is unnecessary to make f(it)==n at the end.