摘要：
Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one of them. Two 阅读全文
posted @ 2019-01-11 11:32
fatttcat
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摘要：
We are given a binary tree (with root node root), a target node, and an integer value K. Return a list of the values of all nodes that have a distance 阅读全文
posted @ 2019-01-11 11:16
fatttcat
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摘要：
Given an array of numbers, verify whether it is the correct preorder traversal sequence of a binary search tree. You may assume each number in the seq 阅读全文
posted @ 2019-01-11 04:44
fatttcat
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Determine whether two given binary trees are identical assuming any number of ‘tweak’s are allowed. A tweak is defined as a swap of the children of on 阅读全文
posted @ 2019-01-11 04:00
fatttcat
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