Suppose we create a deque (double-ended queue) data structure. It is basically a queue, with its addLast and removeFirst operations, but we also add the addFirst and removeLast operations. If a line at the grocery store resembles a deque more than a queue, what is the most likely reason?
I the cashier is very fast
II the line is very long
III the cashier is very slow
A) I
B) II
C) I and II
D) II and III

Question

Quizplus · Accepted Answer

A deque allows for adding and removing elements from both ends. If the line resembles a deque, it suggests that people might be leaving from the back or joining at the front, which is more likely if the line is very long or if the cashier is very slow, causing people to leave or rearrange.

Suppose We Create a Deque (Double-Ended Queue) Data Structure