TomoLink
TCS NQT GuideTCS NQT Programming Logic & CS FundamentalsData Structures: Linked Lists (Singly, Doubly, Circular) Concepts

Data Structures: Linked Lists (Singly, Doubly, Circular) Concepts

Learn core concepts, essential formulas, and attempt practice questions designed on the latest TCS NQT testing patterns.

Key Concepts & Formulas

  • 1Singly Linked List: Nodes contain data and pointer to next node.
  • 2Doubly Linked List: Nodes contain data, next pointer, and prev pointer.
  • 3Circular List: Last node points back to head.

TCS NQT Style Practice Questions

Practice Question 1

What is time complexity of inserting a node at the head of a Singly Linked List?

A) O(1)
B) O(N)
C) O(log N)
D) O(N^2)

Correct Answer: A) O(1)

Step-by-step Solution: Inserting at the head requires modifying the new node's next pointer and redirecting head. No traversal is needed. Time = O(1).

Practice Question 2

What is a disadvantage of Singly Linked Lists compared to Arrays?

A) Random access is not allowed
B) Insertion is slow
C) Heavy memory leak
D) Static sizes

Correct Answer: A) Random access is not allowed

Step-by-step Solution: To access the i-th node, you must traverse from the head sequentially. Arrays allow O(1) index-based access.

Study Pro-Tip

Linked lists are dynamic structures. They do not need contiguous blocks of memory.

Back to TCS NQT Programming Logic & CS Fundamentals Master Guide
PreviousNext