The pre order, in order and postorder traversal of every binary tree are unique, but those of different binary trees may be identical.
但是不同的二叉树的先序遍历序列或中序遍历序列或后序遍历序列有可能是相同的。
3
Article 24 the State, according to the nature, tasks and characteristics of the work of the people's police, prescribes its organizational structure and postorder.