Types of Binary Trees
- Single Threaded: each node is threaded towards either the inorder predecessor or successor.
- Double threaded: each node is threaded towards both the inorder predecessor and successor.
In Python:
def parent(node): if node is node.tree.root: return None else: x = node y = node while True: if is_thread(y.right): p = y.right if p is None or p.left is not node: p = x while not is_thread(p.left): p = p.left p = p.left return p elif is_thread(x.left): p = x.left if p is None or p.right is not node: p = y while not is_thread(p.right): p = p.right p = p.right return p x = x.left y = y.rightRead more about this topic: Threaded Binary Tree
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