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liuchuo avatar liuchuo commented on July 16, 2024 1

没理解错的话，你的问题是“按照前序插入构造出来的BST一定是原始BST” BST的中序是所有结点从小到大的数字排列顺序，BST的前序也给出了，前序中序可以唯一确定一棵树，既然已经给了前序，那么根据这个前序序列的数字大小关系能够得到中序，所以如果按照build方法将小的放在左边，大的放在右边，那么保证了中序遍历的结果就是从小到大的顺序，前序是按照根左右顺序给出的结点，所以结点一个个插入的过程中也保证了这棵树的根、左、右是按照前序的顺序，前序中序已经保证，那么得到的树一定是原始的BST

from pat.

ijesonchen avatar ijesonchen commented on July 16, 2024

明白了。非常感谢。

from pat.

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