https://leetcode.cn/problems/number-of-ways-to-reconstruct-a-tree 这道题曾经在周赛难度分top1呆了几年,如今已经不在难度分top5了。破局的关键是父节点的邻居数肯定不少于子节点,而根节点的邻居数一定是n-1。所以应该先找到根节点,然后逐层向下建树,子节点的邻居一定是父节点的子集,否则就是非法;如果子...
Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes p and q as the lowest node in T that has both p and q as descendants (where we allow...
Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than the node's key. The right subtree of a node contains only nodes with keys greater than the node's key....
Create 60--maximum-dept-of-binary-tree.java May 7, 2023 61--same-tree.java Create 61--same-tree.java May 7, 2023 62--invert-binary-tree.java Create 62--invert-binary-tree.java May 7, 2023 63--binary-tree-maximum-path-sum.java ...
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38voidtopView(Node * root){// Take root position as a base, move left -1, move right +1if(!root)return; vector<int> leftward, rightward; ...
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For this problem, a path is defined as any sequence of nodes from some starting node to any node in the tree along the parent-child connections. The path does not need to go through the root. For example: Given the below binary tree, ...
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Interview 6.2k Interview = 简历指南 + LeetCode + Kaggle tensorlayer 6.2k Deep Learning and Reinforcement Learning Library for Scientists and Engineers 🔥 generative-models 6.1k Collection of generative models, e.g. GAN, VAE in Pytorch and Tensorflow. machine-learning-yearning-cn 6.1k Machine Lear...