Chapter 18: Problem 25

Suppose the following operations are performed on an empty queue: enqueue(5); enqueue(7); dequeue(); enqueue(9); enqueue(12); dequeue(); enqueue(10); Insert numbers in the following diagram to show what will be stored in the static stack after the operations above have executed.

Short Answer

Expert verified

Answer: 9, 12, 10

Step by step solution

Initialize the queue

Begin by initializing an empty queue. Queue = []

Operation 1 - enqueue(5)

Add the number 5 to the queue. Queue = [5]

Operation 2 - enqueue(7)

Add the number 7 to the queue. Queue = [5, 7]

Operation 3 - dequeue()

Remove the first element from the queue. Queue = [7]

Operation 4 - enqueue(9)

Add the number 9 to the queue. Queue = [7, 9]

Operation 5 - enqueue(12)

Add the number 12 to the queue. Queue = [7, 9, 12]

Operation 6 - dequeue()

Remove the first element from the queue. Queue = [9, 12]

Operation 7 - enqueue(10)

Add the number 10 to the queue. Queue = [9, 12, 10] After performing all the operations, the queue now contains the numbers: 9, 12, and 10.

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Suppose the following operations are performed on an empty queue: enqueue(5); enqueue(7); dequeue(); enqueue(9); enqueue(12); dequeue(); enqueue(10); Insert numbers in the following diagram to show what will be stored in the static stack after the operations above have executed.

Short Answer

Step by step solution

Initialize the queue

Operation 1 - enqueue(5)

Operation 2 - enqueue(7)

Operation 3 - dequeue()

Operation 4 - enqueue(9)

Operation 5 - enqueue(12)

Operation 6 - dequeue()

Operation 7 - enqueue(10)

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