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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.
maybe you can use a list that from 0 to len(n) to represent the length
It depends how did you create.
let arr = nums;
Won't work because changin arr will also change nums. It's because they are not primitive types of variables, they are reference types. you can have a research about it to understand better.
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