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POThreaded Binary tree implementation from binary tree
 

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    <p>I am working on assignment for school. It manly consists of a method that takes as input a binary tree and returns a double threaded tree. Eg(if left child = null then left child will be connected with preceding inorder parent and if right child = null the it will link to its inorder succesor. Now I have an idea for the implementation...</p> <p>I iterate recursively trough the original BINARY tree and store into an array the inorder traversal. Now, because my teachers implementation requires that threaded trees be a different class from binary. I must traverse again trough the binary tree and convert each node from binaryNode to threadedNode thus having at the end a "duplicate" of the initial BinaryTree but as Threadedtree type. After I do this I traverse again trough this threadedTree and whenever i see a null left or right child I refer to the inorder arraylist and find the threads.</p> <p>Now as you might have noticed this is extremely inefficient, i am essentially traversing the tree 3 times. My professor has stated that this could be done recursively with only one traversal, essentially converting to threadedNode and finding the threads all at once. I have tried multiple ways but i can not find one that works. Does anyone have any kind of tip or some way i can implement it? Thanks</p> <p>This is the method as specified by the instructor </p> <pre><code>public static &lt;T&gt; ThreadedNode&lt;T&gt; thread(BinaryNode&lt;T&gt; root) { //threads a binary tree } </code></pre>
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