17. Binary Tree to CDLL
The problem can be found at the following link: Question Link
My Approach
To change a Binary Tree into a Circular Doubly Linked List, we follow a simple approach: go through the tree in an inorder manner and transform the left pointer into the previous pointer, and the right pointer into the next pointer of the Doubly Linked List. Here are the steps to implement this approach:
Introduce two global variables, namely
head
andtail
, to keep track of the doubly linked list.Create a custom
in-order
traversal function for moving through the tree.While traversing, create a new node for each tree node and connect it to the previous one, and by this constructing the doubly linked list.
After completing the traversal, link the head and tail nodes to create a circular structure.
Time and Auxiliary Space Complexity
Time Complexity:
O(N)
, whereN
is the number of nodes in the binary tree.Auxiliary Space Complexity:
O(N)
, whereN
is the number of nodes in the binary tree.
Code (C++)
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