https://github.com/grandyang/leetcode/issues/222 类似题目: Closest Binary Search Tree Value 参考资料: https://leetcode.com/problems/count-complete-tree-nodes/ https://leetcode.com/problems/count-complete-tree-nodes/discuss/61958/Concise-Java-solutions-O(log(n)2) https://leetcode.com/problems...
Return the number of good nodes in the binary tree. Example 1: Input: root = [3,1,4,3,null,1,5] Output: 4 Explanation: Nodes in blue are good. Root Node (3) is always a good node. Node 4 -> (3,4) is the maximum value in the path starting from the root. Node 5 -> (...
what do you need to know about the complete binary tree is, let’s assume the root is depth of 0 and the maximum depth is d, so the total number of nodes besides the leaf level will be 2^ (d) - 1, and the number of leaves is in the range of (1, 2^d) and all we need ...
在LeetCode 1973题中,DFS算法的时间复杂度是多少? 文章目录 1. 题目 2. 解题 1. 题目 Given the root of a binary tree, return the number of nodes where the value of the node is equal to the sum of the values of its descendants. A descendant of a node x is any node that is on the...
1. 找到tree 的height O(lg h) 2. 建一个helper function来看index 是否exist, O (lg h) 3. 找last index that node exists. 4. 然后将最后一level的nodes + 之前所有node的数目,最后返回结果即可 Code: #Definition for a binary tree node.#class TreeNode:#def __init__(self, val=0, left=Non...
- A tree whose root node has two subtrees, both of which are full binary trees. 每个节点有 0 或2 个子节点。 perfect binary tree 下边是维基百科的定义。 A perfect binary tree is a binary tree in which all interior nodes have two children and all leaves have the same depth or same ...
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if left and right-subtree height h_sub is the same, then it is full binary tree, so we can get the number of nodes = 2^h_sub -1 else recursively get left subtree node number and right subtree's node number http://www.programcreek.com/2014/06/leetcode-count-complete-tree-nodes-java...
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