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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.
An observation of mine, a little bit of a misleading description, I get it though it adds up eventually being unnecessarily out of scope, it's a thing making it puzzling and tricky though 'till some exent I'd like to say in general, except for that even this new only mathematical optimization sort of like hype ongoing it's definetely off-topic rather than something strictly context based given it should be algorithms first, at least to me.
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The task is asking for the maximum sum of money that can be earned by the nth day, not on the nth day.
The Description needs improvement on explaining the task in a coherent way. I'd strongly recommend putting more detail in how the solution is obtained in the example given the shortcomings of the rest of the Description.