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...
public void flatten(TreeNode root) { if(root==null) return; TreeNode curr = root; while(curr!=null){ //保存右子树, 后面用 TreeNode oldRight = curr.right; //左子树不为空, 执行一系列改变指向的操作 if(curr.left!=null){ //找到左子树的最右节点 TreeNode rightMost = curr.left; while(...
LeetCode Top 100 Liked Questions 297. Serialize and Deserialize Binary Tree (Java版; Hard) 题目描述 Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection l...
俯视角度下观察结果,我想到用root作为基准,令其序号为0,相应的,左节点在根节点基础上序号减一,而右节点加一。 用一个队列,自上而下逐层遍历。因为观察角度是从上往下,上层的节点会遮住同一列的下层所有节点。一边往下,一遍往左右两侧探索,遇到水平方向更远的节点都要保存到结果中。 1 2 3 4 5 6 7 8 9 ...
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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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LeetCode Top 100 Liked Questions 236. Lowest Common Ancestor of a Binary Tree (Java版; Medium) 题目描述 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 betw...
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