If you are given two traversal sequences, can you construct the binary tree?

最新推荐文章于 2020-10-27 09:46:59 发布
转载 最新推荐文章于 2020-10-27 09:46:59 发布 · 812 阅读 · 0

本文探讨了如何通过不同类型的遍历来唯一确定一棵二叉树。文章指出，只有当遍历之一为中序遍历时，才能根据两种遍历组合唯一确定一棵二叉树，并给出了具体的组合方式。

It depends on what traversals are given. If one of the traversal methods is Inorder then the tree can be constructed, otherwise not.

Mirror
Therefore, following combination can uniquely identify a tree.

Inorder and Preorder.
Inorder and Postorder.
Inorder and Level-order.

And following do not.
Postorder and Preorder.
Preorder and Level-order.
Postorder and Level-order.

For example, Preorder, Level-order and Postorder traversals are same for the trees given in above diagram.

Preorder Traversal = AB
Postorder Traversal = BA
Level-Order Traversal = AB

So, even if three of them (Pre, Post and Level) are given, the tree can not be constructed.

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