Which of the following operations is not efficient in a linked list?

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Question: Which of the following operations is not efficient in a linked list?

Options:

Correct Answer: Accessing an element by index

Solution:

Accessing an element by index in a linked list requires traversal from the head, making it O(n) in time complexity.

Which of the following operations is not efficient in a linked list?

Which of the following operations is not efficient in a linked list?

Step 1: Understand what a linked list is. A linked list is a data structure where each element (node) points to the next one.
Step 2: Know that each node in a linked list contains data and a reference (or pointer) to the next node.
Step 3: Realize that linked lists do not have a direct way to access elements by their index like arrays do.
Step 4: To access an element by index in a linked list, you must start at the first node (head) and follow the pointers to the next nodes until you reach the desired index.
Step 5: Count how many nodes you have to go through to reach the desired index. This means you may have to look at each node one by one.
Step 6: Understand that this process takes time proportional to the number of nodes you have to traverse, which is why it is O(n) in time complexity, where n is the number of nodes in the list.
Step 7: Conclude that accessing an element by index is not efficient in a linked list compared to other data structures like arrays.

No concepts available.