1.二叉树定义 // Definition for a binary tree node. struct TreeNode { int val; TreeNode *left; TreeNode *right; TreeNode(int x) : val(x), left(NULL), right(NULL) {} }; 2.遍历 a.递归先序: //递归先序: 中左右.PS:中序-左中右,后序-左右中,调换cout的位置即可 void NLR(TreeNode* T) { if(T!=NULL…

Given a binary tree, return all root-to-leaf paths. Note: A leaf is a node with no children. Example: Input: 1 / \ 2 3 \ 5 Output: ["1->2->5", "1->3"] Explanation: All root-to-leaf paths are: 1->2->5, 1->3 Idea: trave…

Binary Tree Preorder Traversal Given a binary tree, return the preorder traversal of its nodes' values. For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,2,3]. Note: Recursive solution is trivial, could you do it iteratively? ''' Created o…

题目: Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: 1 / \ 2 3 \ 5 All root-to-leaf paths are: ["1->2->5", "1->3"] 链接: http://leetcode.com/problems/binary-tree-paths/ 题解: 求Binar…

版权声明:欢迎查看本博客.希望对你有有所帮助 https://blog.csdn.net/cqs_2012/article/details/24880735 the longest distance of a binary tree 个人信息:就读于燕大本科软件project专业 眼下大三; 本人博客:google搜索"cqs_2012"就可以; 个人爱好:酷爱数据结构和算法,希望将来从事算法工作为人民作出自己的贡献; 博客内容:the longest distance of a bi…

二叉树基础 满足这样性质的树称为二叉树:空树或节点最多有两个子树,称为左子树.右子树, 左右子树节点同样最多有两个子树. 二叉树是递归定义的,因而常用递归/DFS的思想处理二叉树相关问题,例如LeetCode题目 104. Maximum Depth of Binary Tree: // 104. Maximum Depth of Binary Tree int maxDepth(TreeNode* root) { ; +max(maxDepth(root->left),maxDepth(roo…

题意: 给一棵二叉树,要求收集每层的最后一个节点的值.按从顶到底装进vector返回. 思路: BFS比较简单,先遍历右孩子就行了. /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ class Solut…

Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7…

Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7…

https://www.geeksforgeeks.org/bfs-vs-dfs-binary-tree/ What are BFS and DFS for Binary Tree? A Tree is typically traversed in two ways: Breadth First Traversal (Or Level Order Traversal) Depth First Traversals Inorder Traversal (Left-Root-Right) Preor…