Data Structures | Linked List | Question 16

You are given pointers to first and last nodes of a singly linked list, which of the following operations are dependent on the length of the linked list?

(A)

Delete the first element

(B)

Insert a new element as a first element

(C)

Delete the last element of the list

(D)

Add a new element at the end of the list

Answer: (C)

Explanation:

a) Can be done in O(1) time by deleting memory and changing the first pointer. b) Can be done in O(1) time, see push() here c) Delete the last element requires pointer to previous of last, which can only be obtained by traversing the list. d) Can be done in O(1) by changing next of last and then last.

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