这道题目本身不难,给出后序遍历和中序遍历,求到节点最小路径的叶子,同样长度就输出权值小的叶子. Uva上不去了,没法測.基本上是依照ruka的代码来的.直接上代码 //Uva548 Tree #include<iostream> #include<algorithm> #include<string> #include<sstream> #include<cctype> using namespace std; const int maxv=10…

Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). For example:Given binary tree{3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7 return its level order traversal as: [ [3], [9,20], [15,7] ] con…

［抄题］: Given a non-empty binary tree, return the average value of the nodes on each level in the form of an array. Example 1: Input: 3 / \ 9 20 / \ 15 7 Output: [3, 14.5, 11] Explanation: The average value of nodes on level 0 is 3, on level 1 is 14.5,…

二叉树 / Binary Tree 二叉树是树结构的一种,但二叉树的每一个节点都最多只能有两个子节点. Binary Tree: 00 |_____ | | 00 00 |__ |__ | | | | 00 00 00 00 对于二叉树的遍历,主要有以下三种基本遍历方式: 先序遍历:先显示节点值,再显示左子树和右子树 中序遍历:先显示左子树,再显示节点值和右子树 后序遍历:先显示左子树和右子树,再显示节点值 下面将用代码构建一个二叉树,并实现三种遍历方式, 完整代码 class TreeNode…

[107-Binary Tree Level Order Traversal II(二叉树层序遍历II)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root). For example…

Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root). For example:Given binary tree [3,9,20,null,null,15,7], 3 / \ 9 20 / \ 15 7 return its bottom-up level or…

关于二叉树的遍历请看: http://www.cnblogs.com/stAr-1/p/7058262.html /* 考察基本功的一道题,迭代实现二叉树前序遍历 */ public List<Integer> preorderTraversal(TreeNode root) { List<Integer> res = new ArrayList<>(); if (root==null) return res; Stack<TreeNode> stack =…

二叉树的创建代码==>C++ 创建和遍历二叉树 深度优先遍历:是沿着树的深度遍历树的节点,尽可能深的搜索树的分支. //深度优先遍历二叉树void depthFirstSearch(Tree root){ stack<Node *> nodeStack; //使用C++的STL标准模板库 nodeStack.push(root); Node *node; while(!nodeStack.empty()){ node = nodeStack.top(); printf(format, n…

我准备开始一个新系列[LeetCode题解],用来记录刷LeetCode题,顺便复习一下数据结构与算法. 1. 二叉树 二叉树(binary tree)是一种极为普遍的数据结构,树的每一个节点最多只有两个节点--左孩子结点与右孩子结点.C实现的二叉树: struct TreeNode { int val; struct TreeNode *left; // left child struct TreeNode *right; // right child }; DFS DFS的思想非常朴素:根据…

Given a binary tree where every node has a unique value, and a target key k, find the value of the nearest leaf node to target k in the tree. Here, nearest to a leaf means the least number of edges travelled on the binary tree to reach any leaf of th…