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With a little more effort, I can express a binary tree — a tree with each node holding a value and exactly two branches. A simple binary tree in Haskell looks like this.
只要多付出一点功夫，就能表达b树——b树的每个节点都容纳一个值和两个分支。
Given preorder and inorder traversal of a tree, construct the binary tree.
给定一个二叉树的前序和中序遍历，重建这棵二叉树。
As input sequences are the preorder, inorder and postorder of a binary tree, we give the discussion about creating the tree to all conditions.
在输入为先根序列、中根序列与后根序列的前提下，对各种二叉树建树的情况进行了讨论；
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