否则,我们应访访问当前节点的右孩子(入栈)。 // C++ CODE: classSolution {public: vector<int> postorderTraversal(TreeNode*root) { stack<TreeNode*>s; vector<int>result;while(root){ s.push(root); root= root->left; }while(!s.empty()){ TreeNode* tmp =s.top();if(tmp->right){if(resu...
int fromNode (在 correctBinaryTree 中不可见) int toNode (在 correctBinaryTree 中不可见) 当以root 为根的二叉树被解析后,值为 fromNode 的节点 TreeNode 将其右子节点指向值为 toNode 的节点 TreeNode 。然后, root 传入 correctBinaryTree 的参数中。 来源:力扣(LeetCode) 链接:https://leetcode-cn...
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 inorder and postorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. For example, given inorder = [9,3,15,20,7] postorder = [9,15,7,20,3] Return the following binary tree: 3 / \ 9 20 / \ 15 7 描述 给定...
LeetCode 105. Construct Binary Tree from Preorder and Inorder Traversal Description Given preorder and inorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. For example, given ...
LeetCode Top 100 Liked Questions 297. Serialize and Deserialize Binary Tree (Java版; Hard) 题目描述 AI检测代码解析 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, ...
Can you solve this real interview question? Lowest Common Ancestor of a Binary Tree - 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 [https://en.wikipedia.org/wi
图片来源:https://leetcode.com/articles/binary-tree-right-side-view/ 对于时间复杂度来说,基本上都是O(n),因为要访问所有的点。 对于空间复杂度来说,BFS取决于扫描过程中每层的node数,就是树的宽度,而DFS取决于扫描过程中树的深度。最坏情况两个都是O(n)。
二维树状数组Binary Indexed Tree LeetCode题目:308. Range Sum Query 2D - Mutable Given a 2D matrixmatrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1,col1) and lower right corner (row2,col2). ...
leetcode:Binary Tree Maximum Path Sum | LeetCode OJ lintcode:(94) Binary Tree Maximum Path Sum Problem Statement Given a binary tree, find the maximum path sum. The path may start and end at any node in the tree. Example Given the below binary tree: ...