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How does the recursion preorder traversal algorithm go back to parent?
前序遍历的递归算法如何回到父母吗？
Vessel segments in two images are matched by the preorder traversal of the binary trees, and the method is proved fast and accurate.
同时根据二叉树的前序遍历结果匹配血管段，有效地提高了匹配的速度和准确度。
Enter the tree traversal Preorder traversal of the results and the results of established tree and gives the results after the traversal.
输入树的前序遍历结果和中序遍历结果建立起这棵树并给出后序遍历结果。
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