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For preorder traversal, in the worst case, the stack will rise to size n/2, where n refer to number of nodes in the tree. Another method of traversing binary tree non-recursively that does not employ stack requires pointers to the parent node (called threaded binary tree).
A threaded binary tree is a binary tree wherein every node which does not have a right child has a THREAD (a third link) to its INORDER successor. By doing this threading we ignore the recursive method of traversing a tree and employ of stack, that makes use of many memory and time.
A node structure of threaded binary is following :
For a threaded binary tree the node structure varies a bit and its like this -
struct NODE *leftchild;
int node_value;
struct NODE *rightchild;
struct NODE *thread; /* third pointer to its inorder successor */
}
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