Given a binary tree, determine if it is acomplete binary tree. Definition of a complete binary tree fromWikipedia: 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 as possible. It can have between 1 a...
classSolution{ bool isTheEnd =false; int depth =0;public: bool isCompleteTree(TreeNode* root) {if(root == NULL)returntrue; depth = GetDepth(root);returnGetAns(root,1); } int GetDepth(TreeNode *root) {if(root == NULL)return0;returnmax(GetDepth(root->left), GetDepth(root->right)...
题目链接:Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree 题目大意:要求你去找到一条路径,要求这条路径上的值跟要求的arr数组长度和值都一样,并且这条路径是从根节点到叶子节点 题目思路:一个简单的dfs即可,我们可以知道,对于找到的路径,每个节点的层数就...
Given a binary tree, determine if it is acomplete binary tree. Definition of a complete binary tree fromWikipedia: 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 as possible. It can have between 1 a...
When I started this project, I didn't know a stack from a heap, didn't know Big-O anything, anything about trees, or how to traverse a graph. If I had to code a sorting algorithm, I can tell ya it wouldn't have been very good. Every data structure I've ever used was built ...
LeetCode 110 check if balanced binary tree 平衡树的定义: 任意节点的左右子节点的高度差不超过1. 说到左右子树 就想到递归。 我们要check所有的节点是不是符合这个要求。 isBalanced(root) = isBalanced(root.left) && isBalanced(root.right) but given a node, how to check if it is or not, we ...
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 as possible. It can have between 1...
A full node means a node that contains both left and right child. If we do a level order traversal for a complete binary tree, after we see the first non-full node, all the subsequent nodes must be leaf nodes (no left or right child). ...
1classSolution2{3public:4boolisCompleteTree(TreeNode*root)5{6if(root ==NULL)7returnfalse;89queue<TreeNode *>q;10q.push(root);11boolmustHaveNoChild =false;12boolresult =true;13while(!q.empty())14{15TreeNode* pNode =q.front();16q.pop();17if(mustHaveNoChild)//如果一个节点没有子...
958. Check Completeness of a Binary Tree//https://leetcode.com/problems/check-completeness-of-a-binary-tree/description/classTreeNode(var `val`: Int) { var left: TreeNode? =nullvar right: TreeNode? =null}classSolution { fun isCompleteTree(root: TreeNode?): Boolean {if(root ==null) ...