leetcode之Construct Binary Tree from Preorder and Inorder Traversal

Given preorder and inorder traversal of a tree, construct the binary tree.

Note:
You may assume that duplicates do not exist in the tree.

给出树的前序和中序遍历序列，构造二叉树，假设树唯一存在。

剑指offer面试题6，重建二叉树