Given a Singly Linked List, starting from the second node delete all alternate nodes of it. For example, if the given linked list is 1->2->3->4->5 then your function should convert it to 1->3->5, and if the given linked list is 1->2->3->4 then convert it to 1->3.
Method 1 (Iterative):
Keep track of previous of the node to be deleted. First, change the next link of the previous node and iteratively move to the next node.
List before calling deleteAlt() 1 2 3 4 5 List after calling deleteAlt() 1 3 5
Time Complexity: O(n) where n is the number of nodes in the given Linked List.
Method 2 (Recursive):
Recursive code uses the same approach as method 1. The recursive code is simple and short but causes O(n) recursive function calls for a linked list of size n.
Time Complexity: O(n)
Please refer complete article on Delete alternate nodes of a Linked List for more details!