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What is the time complexity of deleting the last element from a singly linked li

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Question: What is the time complexity of deleting the last element from a singly linked list?

Options:

  1. O(1)
  2. O(n)
  3. O(log n)
  4. O(n^2)

Correct Answer: O(n)

Solution: 

To delete the last element from a singly linked list, you must traverse the list to find the second-to-last element, resulting in O(n) time complexity.

What is the time complexity of deleting the last element from a singly linked li

Practice Questions

Q1
What is the time complexity of deleting the last element from a singly linked list?
  1. O(1)
  2. O(n)
  3. O(log n)
  4. O(n^2)

Questions & Step-by-Step Solutions

What is the time complexity of deleting the last element from a singly linked list?
  • Step 1: Understand what a singly linked list is. It is a data structure where each element (node) points to the next one.
  • Step 2: Identify the last element in the list. In a singly linked list, you cannot directly access the last element because you only have a reference to the first element (head).
  • Step 3: To delete the last element, you need to find the second-to-last element. This is because you need to update its pointer to null (or None) to remove the last element.
  • Step 4: Start from the head of the list and traverse through each node until you reach the second-to-last node. This requires visiting each node one by one.
  • Step 5: Count the number of nodes you visit. In the worst case, you will visit all n nodes in the list to find the second-to-last node.
  • Step 6: Since you have to traverse the entire list to delete the last element, the time complexity is O(n).
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