Queue in Python

Time complexity

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What time do operations append() and pop() take on a dequeue? Why?

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Constant time because each chunk of elements stores the references to the previous and to the next one.

Quadratic time because we first need to find a place to store an element and then move all other elements by one.

Constant time because pointers to the both ends of a doubly-linked list are stored.

Linear time because each element contains a reference to the next element.

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