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<font size="5">5.5 Threaded Binary Trees </font><font color="#000000">
<font color="#0033CC">threads </font>~ replace the null links by pointer to other nodes in the tree.
<br><font color="#FF0000">construct rules:</font> <i><font size="3" color="#CC0099">(inorder Threaded Tree)</font></i>
(1) If <i> ptr->left_child </i> is <i>null,</i>
replace the<i> null</i> link with a pointer to the inorder
predecessor of ptr
(2) If <i>ptr->right_child </i>is <i>null,</i>
replace the <i>null</i> link with a pointer to the inorder
successor of ptr
<img src="IMAGE/text5-0.gif" width="305" height="162"> </font></font></b>
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