【PAT甲级 - C++题解】1020 Tree Traversals

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🔑中文翻译：树的遍历
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1020 Tree Traversals

Suppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequences, you are supposed to output the level order traversal sequence of the corresponding binary tree.

Input Specification:

Each input file contains one test case. For each case, the first line gives a positive integer N (≤30), the total number of nodes in the binary tree. The second line gives the postorder sequence and the third line gives the inorder sequence. All the numbers in a line are separated by a space.

Output Specification:

For each test case, print in one line the level order traversal sequence of the corresponding binary tree. All the numbers in a line must be separated by exactly one space, and there must be no extra space at the end of the line.

Sample Input:

7
2 3 1 5 7 6 4
1 2 3 4 5 6 7

Sample Output:

4 1 6 3 5 7 2

题意

第一行包含整数 $N$，表示二叉树的节点数。

第二行包含 $N$ 个整数，表示二叉树的后序遍历。

第三行包含 $N$ 个整数，表示二叉树的中序遍历。

输出一行 N N