改进的前序遍历树模型 The Nested Set Model
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。
Vessel segments in two images are matched by the preorder traversal of the binary trees, and the method is proved fast and accurate.
说明：二叉树操作：建立二叉树，前序遍历二叉树、中序、后序遍历二叉树。
Binary tree operation: create a binary tree, before traversing binary, inorder, postorder binary tree traversal.
给定一个二叉树的前序和中序遍历，重建这棵二叉树。
Given preorder and inorder traversal of a tree, construct the binary tree.
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