线索二叉树 包括了类声明，创建树，插入节点，删除树等操作。-clues, including a binary tree type statement, create tree node insert, delete, etc tree.

线索二叉树 建立中序线索二叉树，并且中序遍历 求中序线索二叉树上已知结点中序的前驱和后继-Binary tree in order to establish clues clues tree, and in the traversal sequence for clues in the binary tree nodes on the known sequence of the precursor and follow-up

由双亲表示法建立3棵树，将这些树表示的森林转换成二叉树，对二叉树进行线索化并遍历。-Law established by the parents said three trees, these trees will be converted into a binary representation of the forest for clues and binary tree traversal.

定义线索链表类型，实现线索二叉树的基本操作。-Define the list of clues to achieve the basic operation of the two fork tree.