Given an array where elements are sorted in ascending order, convert it to a height balanced BST. For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees ofeverynode never differ by more than 1. Example: Given the sorted array:...
Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Callingnext()will return the next smallest number in the BST. Note:next()andhasNext()should run in average O(1) time and uses O(h) memory, wherehis the height of t...
建议和leetcode 87. Scramble String 字符串拼凑 && DFS深度优先搜索 和 leetcode 95. Unique Binary Search Trees II 递归构造所有可能的搜索二叉树BST + 卡特兰数 一起学习,因为做法类似 这道题可以和leetcode 108. Convert Sorted Array to Binary Search Tree 构建平衡二叉搜索树 + DFS 一起学习 建议和leet...
}/*void creatTree(TreeNode *&root,vector<int> &num,int left,int right) { if(left>right)return; int mid=(left+right)/2; root=new TreeNode(num[mid]); creatTree(root->left,num,left,mid-1); creatTree(root->right,num,mid+1,right); } TreeNode *sortedArrayToBST(vector<int> &num...
Can you solve this real interview question? Convert Sorted List to Binary Search Tree - Given the head of a singly linked list where elements are sorted in ascending order, convert it to a height-balanced binary search tree. Example 1: [https://asse
*/class Solution{public:TreeNode*bstToGst(TreeNode*root){intpre=0;order(root,pre);returnroot;}private:voidorder(TreeNode*root,int&pre){if(!root)return;stack<TreeNode*>s;while(root or s.size()){if(root){s.push(root);root=root->right;}else{root=s.top();s.pop();root->val+=pre...
LeetCode 112. Path Sum Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. For example: Given the below binary tree and sum = 22, ...
/** * 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: TreeNode* sortedArrayToBST(vector<int>& nums) { return buildTree(nums...
Given an integer arraynumswhere the elements are sorted inascending order, convertit to aheight-balancedbinary search tree. Example 1: Input:nums = [-10,-3,0,5,9]Output:[0,-3,9,-10,null,5]Explanation:[0,-10,5,null,-3,null,9] is also accepted: ...
code 代码语言:javascript 代码运行次数:0 type TreeNode struct{Val int Left*TreeNode Right*TreeNode}funclowestCommonAncestor(root,p,q*TreeNode)*TreeNode{ifroot==nil{returnnil}forroot!=nil{ifp.Val>root.Val&&q.Val>root.Val{root=root.Right}elseifp.Val<root.Val&&q.Val<root.Val{root=root.Lef...