Python program to convert a binary tree to a circular doubly link list.














































Python program to convert a binary tree to a circular doubly link list.



Description:
To convert Binary tree into Doubly Linked List (DLL) we need to  convert  left and right subtrees to DLLs and maintan end of those lists. then, adjust the pointers.

Program:

def BSTToDLL(root): #main fuction to take the root of the BST and return the head of the doubly linked list prev=None head=None BSTToDoublyList(root,prev,head) return head def BSTToDoublyList(root,prev,head): if(not root):return BSTToDoublyList(root.left,prev,head) #current nodes left points to previous node root.left=prev prev.right=root #previous nodes right points to current node head=root # If previous is NULL that current node is head right=root.right #Saving right node #Now we need to make list created till now as circular head.left=root root.right=head #For right-subtree/parent, current node is inorder predecessor prev=root BSTToDoublyList(right,prev,head)


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