May 032017
 

The structure of Node of a Binary Tree and Doubly linked list are same.

struct Node
{
   int data;
   Node* left;
   Node* right; 
}

 Structure of Node of a Binary Tree    

struct Node
{
   int data;
   Node* previous;
   Node* next; 
}

  Structure of Node of a Doubly linked list

If we treat left pointer as previous and right pointer as next, we can use the Node of a Binary Tree to represent node of a Doubly linked list or vice-versa.

Given a binary tree, modify the pointers in each node of the tree so that they represent a Doubly linked. Order of the nodes in DLL should be same as that in the in-order traversal.

If the Input Binary tree is as below

Binary Search Tree

then the function should modify pointers in the nodes, as shown below and return the head pointer.

Doubly Linked List
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