Consider an implementation of a queue using a doubly linked list with two dummy/sentinel nodes. Given...
Consider an implementation of a queue using a doubly linked list with two dummy/sentinel nodes. Given this implementation, what is the time complexity to retrieve the second oldest element in the queue using only push(), pop(), and front()?
Select one:
a. O(n) with modifying the queue
b. It cannot be done.
c. O(1) without modifying the queue
d. O(n) without modifying the queue
e. O(1) with modifying the queue
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