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The dynamic array data structure is used as the basis of Java's ArrayList library class. Describe this data structure and explain how it achieves (amortized)

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The "dynamic array" data structure is used as the basis of Java's ArrayList library class. Describe this data structure and explain how it achieves (amortized) constant-time adding of elements, while also giving constant-time random access of elements. As part of your answer, make sure to explain what "amortized" means for the data structure

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