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Linked List MCQs

Solve topic-wise placement questions and improve your skills.

Linked List Progress

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1

Which algorithm is used to detect a cycle in a linked list using two pointers in O(1) space?

A. Floyd Cycle-Finding (Tortoise and Hare)

B. Dijkstra Shortest Path

C. Kadane Algorithm

D. Boyer-Moore Voting

2

What is the time complexity to find the middle element of a singly linked list in a single pass?

A. O(N)

B. O(N^2)

C. O(log N)

D. O(1)

3

How many pointer updates are required to insert a node at the head of a singly linked list?

A. O(1) with 1 pointer change

B. O(N) with N pointer changes

C. O(log N)

D. Requires reallocation of whole list

4

What is the main drawback of a singly linked list compared to an array?

A. Extra pointer memory overhead and lack of O(1) random access

B. Fixed size allocation

C. Cannot store objects

D. Slow insertion at head

5

How do you reverse a singly linked list iteratively in O(N) time and O(1) space?

A. Using three pointers: prev, curr, next

B. Using a stack of size N

C. Using recursion without base case

D. Swapping values of all nodes

6

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 6)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

7

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 7)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

8

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 8)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

9

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 9)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

10

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 10)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

11

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 11)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

12

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 12)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

13

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 13)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

14

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 14)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

15

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 15)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

16

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 16)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

17

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 17)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

18

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 18)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

19

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 19)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

20

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 20)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

21

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 21)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

22

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 22)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

23

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 23)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

24

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 24)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

25

What is the optimal approach to merge two sorted linked lists into one sorted list (Variation 25)?

A. Iterative pointer comparison with dummy head in O(N+M) time and O(1) space

B. Copying both to array and sorting in O((N+M) log(N+M))

C. Nested traversal comparing every node

D. Breadth first search traversal

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