Introduction

Traversing a Linked List means visiting every node one by one from the head node until the end.

The task is to:

  • start from head node
  • move through next pointers
  • print or process every node

Example:

Input:1 -> 2 -> 3 -> 4

Output:
1 2 3 4

Explanation:

Start from head node.Visit:
1

Move to next:
2
Continue traversal
until NULL.

This problem is one of the most important basics of:

 Linked List Data Structure

Constraints

 1 <= Number of Nodes <= 10^5-10^9 <= Node Value <= 10^9

Approach 1 : Brute Force (Using Extra Array)

Explanations:

Explanation:

The idea is:

  • traverse linked list
  • store nodes into array
  • print array elements

Steps:

  1. Start from head.
  2. Store node values.
  3. Move to next node.
  4. Print stored values.

This approach works but:

  • uses extra space unnecessarily

So direct traversal is preferred.

Dry Run

Input:1 -> 2 -> 3 -> 4

Step 1:
Visit 1

Array:
[1]

Step 2:
Visit 2

Array:
[1,2]

Step 3:
Visit 3

Array:
[1,2,3]

Step 4:
Visit 4

Array:
[1,2,3,4]

Final Output:
1 2 3 4

Practice :

Complexity Analysis :

Time Complexity:- O(n)
Explanation :
Each node is visited once.

Space Complexity:- O(n)
Explanation :
Extra array is used to store node values.

Approach 2 : Optimal Solution(Direct Traversal)

Explanations:

Explanation:

This is the most optimized and interview-preferred solution.

The idea is:

  • start from head node
  • directly print node values
  • move using next pointer

This avoids extra space usage.

Dry Run

Input:1 -> 2 -> 3 -> 4

Current:
1

Print:
1

Move to:
2

Print:
2

Move to:
3

Print:
3

Move to:
4

Print:
4

Move to:
NULL

Traversal Ends

Practice :

Complexity Analysis :

Time Complexity:- O(n)
Explanation :
Each node is visited only once.

Space Complexity:- O(1)
Explanation :
No extra space is used.

Why This Problem is Important

This problem builds the foundation for:

  • Linked List traversal
  • Pointer manipulation
  • Dynamic data structures
  • Node processing
  • Sequential access

Real-World Applications

Linked List traversal is used in:

  • Music playlists
  • Browser history
  • Memory management
  • Undo operations
  • Dynamic data storage

Common Beginner Mistakes

  • Forgetting NULL condition
  • Infinite loops
  • Incorrect next pointer movement
  • Losing head node reference
  • Wrong traversal order

Interview Tip

Interviewers often expect:

  • correct pointer traversal
  • proper NULL handling
  • O(n) traversal logic
  • clean node iteration

Always explain:

  • how traversal moves node by node
  • why linked lists require sequential access

Related Questions

  • Insert Node in Linked List
  • Delete Node in Linked List
  • Search in Linked List
  • Reverse Linked List
  • Middle of Linked List

Final Takeaway

The Traverse Linked List problem is one of the most important beginner linked list problems.

It teaches:

  • pointer traversal
  • node iteration
  • linked structure navigation
  • dynamic memory understanding

Understanding this problem builds a strong foundation for:

  •  advanced linked list problems
  • pointer manipulation
  • interview-level data structure questions.