What is the time complexity of reversing a linked list?
Practice Questions
Q1
What is the time complexity of reversing a linked list?
O(1)
O(n)
O(log n)
O(n^2)
Questions & Step-by-Step Solutions
What is the time complexity of reversing a linked list?
Step 1: Understand what a linked list is. A linked list is a collection of nodes where each node points to the next node.
Step 2: Know that reversing a linked list means changing the direction of the pointers so that the last node becomes the first and the first becomes the last.
Step 3: Realize that to reverse the linked list, you need to look at each node one by one.
Step 4: Count how many nodes are in the linked list. Let's say there are 'n' nodes.
Step 5: Since you need to visit each of the 'n' nodes to reverse the pointers, the time taken is proportional to 'n'.
Step 6: Therefore, the time complexity of reversing a linked list is O(n).
