What are null nodes filled with in a threaded binary tree?
Question
What are null nodes filled with in a threaded binary tree?
Solution
In a threaded binary tree, null nodes are filled with references to the in-order predecessor or successor nodes. This is done to make in-order traversal faster and do it without stack or recursion. The right pointer of the last node will point to the first node, and the left pointer of the first node will point to the last node, making it easier to navigate the tree.
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