GATE CS 2022 Set 1 — Question 15
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Programming & Data Structures → Linked Lists → List Reversal
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Question
Consider the problem of reversing a singly linked list. To take an example, given the linked list below,
the reversed linked list should look like
Which one of the following statements is TRUE about the time complexity of algorithms that solve the above problem in space?
Correct answer
(A) The best algorithm for the problem takes θ(n) time in the worst case.
Solution
Option (A) is correct. A singly linked list can be reversed in place using an iterative algorithm that maintains three pointers:
prev, current, and next. This approach iterates through the list once, reversing the next pointer of each node to point to the prev node. This process requires auxiliary space and takes time, where is the number of nodes in the list.Continue learning with Success Tracker
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