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.
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。
Enter the tree traversal Preorder traversal of the results and the results of established tree and gives the results after the traversal.
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