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Queue Questions

Home > Technical Aptitude > Data Structures > Queue > General Questions
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Choose the correct option.

If a queue is implemented with a linked list, keeping track of a front node and a rear node with two reference variables. Which of these reference variables will change during an insertion into an
EMPTY queue ?


AOnly front changes

BBoth change

COnly rear changes

DNeither changes

Answer: Option B

Explanation:

insertion can be done at rear end so only rear will change option c


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Which among the following are applications of queues ?


AQueues keep track of events waiting to be handled, like multiple button clicks

BQueues are used for evaluation of arithmetic expressions

CQueues are used in parsing

DNone of these

Answer: Option A

Explanation:


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The following data structure allows deleting data elements from front and inserting at rear


AStacks

BQueues

CDeques

DBinary search tree

Answer: Option B

Explanation:

Here is no explanation for this answer

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This data structure allows deletions at both ends of the list but insertion at only one end.


AInput-restricted deque

BOutput-restricted deque

CPriority queues

DNone of the above

Answer: Option A

Explanation:

Here is no explanation for this answer

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A data structure where elements can be added or removed at either end but not in the middle is referred as


ALinked lists

BStacks

CQueues

DDeque

Answer: Option D

Explanation:

Deque is not  data structure it is an operation for removing elements from the queue data structure

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What is the time complexity of deleting from the rear end of the dequeue implemented with a singly linked list?


AO(nlogn)

BO(logn)

CO(n)

DO(n2)

Answer: Option C

Explanation:

Since a singly linked list is used, first you have to traverse till the end, so the complexity is O(n).

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After performing these set of operations, what does the final list look contain?

InsertFront(10);
InsertFront(20);
InsertRear(30);
DeleteFront();
InsertRear(40);
InsertRear(10);
DeleteRear();
InsertRear(15);
display();


A10 30 10 15

B20 30 40 15

C20 30 40 10

D10 30 40 15

Answer: Option D

Explanation:

A careful tracing of the given operation yields the result.
10
20 10
20 10 30
10 30
10 30 40
10 30 40 10
10 30 40
10 30 40 15

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A Double-ended queue supports operations such as adding and removing items from both the sides of the queue. They support four operations like addFront(adding item to top of the queue), addRear(adding item to the bottom of the queue), removeFront(removing item from the top of the queue) and removeRear(removing item from the bottom of the queue). You are given only stacks to implement this data structure. You can implement only push and pop operations. What are the total number of stacks required for this operation?(you can reuse the stack)


A1

B2

C3

D4

Answer: Option B

Explanation:

The addFront and removeFront operations can be performed using one stack itself as push and pop are supported (adding and removing element from top of the stack) but to perform addRear and removeRear you need to pop each element from the current stack and push it into another stack, push or pop the element as per the asked operation from this stack and in the end pop elements from this stack to the first stack.

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You are asked to perform a queue operation using a stack. Assume the size of the stack is some value ‘n’ and there are ‘m’ number of variables in this stack. The time complexity of performing deQueue operation is (Using only stack operations like push and pop)(Tightly bound).


AO(m)

BO(n)

CO(m*n

DData is insufficient

Answer: Option A

Explanation:

To perform deQueue operation you need to pop each element from the first stack and push it into the second stack. In this case you need to pop ‘m’ times and need to perform push operations also ‘m’ times. Then you pop the first element from this second stack (constant time) and pass all the elements to the first stack (as done in the beginning)(‘m-1’ times). Therfore the time complexity is O(m).

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Consider you have an array of some random size. You need to perform dequeue operation. You can perform it using stack operation (push and pop) or using queue operations itself (enQueue and Dequeue). The output is guaranteed to be same. Find some differences?


AThey will have different time complexities

BThe memory used will not be different

CThere are chances that output might be different

DNo differences

Answer: Option A

Explanation:

To perform operations such as Dequeue using stack operation you need to empty all the elements from the current stack and push it into the next stack, resulting in a O(number of elements) complexity whereas the time complexity of dequeue operation itself is O(1). And there is a need of a extra stack. Therefore more memory is needed.

Workspace

Data Structures Queue Questions and Answers pdf

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Data Structures Queue Customize Online Mock Test

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Data Structures Queue MCQs Practice Questions with Answer

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Data Structures Queue solved examples question

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Why Data Structures Queue?

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