help to know a data structure

Programmer Question

Hi,
I have an assignment to write an algorithm to find duplicate in a Dynamic Sorted Array. I want to write this algoirthm but before starting, I must know the data structure Dynamic Sorted Array but, I dont know it. I tried to googling but I couldn't find anything like Dynamic Sorted Array. would you please guide me? What is this data structure and how dos it look like? thanks.

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