完全二叉树的定义:若设二叉树的深度为h,除第 h 层外,其它各层 (1-h-1) 的结点数都达到最大个数,第 h 层所有的结点都连续集中在最左边,这就是完全二叉树. 解题思路:将树按照层进行遍历,如果出现null后还出现非null则能证明这个不是完全二叉树 https://leetcode.com/problems/check-completeness-of-a-binary-tree/discuss/205768/Java-easy-Level-Order-Traversal-one-whil…

原题链接在这里:https://leetcode.com/problems/check-completeness-of-a-binary-tree/ 题目: Given a binary tree, determine if it is a complete binary tree. Definition of a complete binary tree from Wikipedia:In a complete binary tree every level, except possibly…

题目来源 题目来源 C++代码实现 /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ class Solution { public: bool isCompleteTree(TreeNode* root)…

题目如下: Given a binary tree, determine if it is a complete binary tree. Definition of a complete binary tree from Wikipedia:In a complete binary tree every level, except possibly the last, is completely filled, and all nodes in the last level are as fa…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 BFS DFS 日期 题目地址:https://leetcode.com/problems/check-completeness-of-a-binary-tree/ 题目描述 Given a binary tree, determine if it is a complete binary tree. Definition of a complete…

Given a binary tree, determine if it is a complete binary tree. Definition of a complete binary tree from Wikipedia:In a complete binary tree every level, except possibly the last, is completely filled, and all nodes in the last level are as far left…

Given a binary tree, determine if it is a complete binary tree. Definition of a complete binary tree from Wikipedia:In a complete binary tree every level, except possibly the last, is completely filled, and all nodes in the last level are as far left…

给定一个二叉树,确定它是否是一个完全二叉树. 百度百科中对完全二叉树的定义如下: 若设二叉树的深度为 h,除第 h 层外,其它各层 (1-h-1) 的结点数都达到最大个数,第 h 层所有的结点都连续集中在最左边,这就是完全二叉树.(注:第 h 层可能包含 1~ 2h 个节点.) 示例 1: 输入:[1,2,3,4,5,6] 输出:true 解释:最后一层前的每一层都是满的(即,结点值为 {1} 和 {2,3} 的两层),且最后一层中的所有结点({4,5,6})都尽可能地向左. 示例 2: 输入:…

2020-02-19 13:34:28 问题描述: 问题求解: 判定方式就是采用层序遍历,对于一个完全二叉树来说,访问每个非空节点之前都不能访问过null. public boolean isCompleteTree(TreeNode root) { if (root == null) return true; Queue<TreeNode> q = new LinkedList<>(); q.add(root); boolean flag = false; while (!q.i…

Question A complete binary tree is a binary tree in which every level, except possibly the last, is completely filled, and all nodes are as far left as possible. Solution 1 -- BFS Using BFS and a flag. public class Solution { public boolean checkComp…