Question

How do you delete the tail node of a singly linked list if the link has...

How do you delete the tail node of a singly linked list if the link has the head and does no have tail? Write the code. How much time does it take to do it? (java)

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Answer #1
  1. We need iterate through the linked till before last node
  2. Store the last in temp variable
  3. Remove the link with before last node by making prev->next as NULL
  4. Than delete the last node

It takes O(n) as we dont have the tail node so we need to iterate the till before last node and remove that node

void deleteEnd() 
{ 

        // need to to find the lst before node
        Node prev = head; 
        // iterate till the last node
    while (prev.next.next != null) 
        prev = prev.next; 
    
    // making the prev.next as null so that the link will be removed 
    prev.next = null; 
}

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