Describe the structure and pseudo-code for an array-based implementation of the vector ADT that achieves O(1) time

Question:

Describe the structure and pseudo-code for an array-based implementation of the vector ADT that achieves O(1) time for insertions and removals at index 0, as well as insertions and removals at the end of the vector. Your implementation should also provide for a constant time elemAtRank function.

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