douqiang4501 2017-11-19 00:52
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关于“等效二叉树”问题

I am reading the tour of Go, it has a problem of equivalent binary tree. The article said A function to check whether two binary trees store the same sequence is quite complex in most languages.

https://tour.golang.org/concurrency/7

I am a little confused, could we just use any traversal method like inorder traversal the tree and verify the resulted sequence is same. I think it is pretty simple. Anyone could let me know if my understanding is wrong?

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  • dsf6565 2017-11-19 09:17
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    It's implicit in the problem definition that you're comparing whether two binary search trees contain the same multiset of elements, and while an in-order of a BST will give you the elements in sorted order, the same is not true of any other traversal. E.g. the tree ¹\₂ has preorder 12 while the tree ₁/² has preorder 21, despite that both contain the same elements.

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