Given a binary treeroot, returnthe maximum sum of all keys of any sub-tree which is also a Binary Search Tree (BST). Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than the node's key. The right subtree of a node contains only n...
Given the root of a tree, you are asked to find the most frequent subtree sum. The subtree sum of a node is defined as the sum of all the node values formed by the subtree rooted at that node (including the node itself). So what is the most frequent subtree sum value? If there i...
Can you solve this real interview question? Maximum Sum BST in Binary Tree - Given a binary tree root, return the maximum sum of all keys of any sub-tree which is also a Binary Search Tree (BST). Assume a BST is defined as follows: * The left subtree
Given the root of a binary tree, find the maximum average value of any subtree of that tree. (A subtree of a tree is any node of that tree plus all its descendants. The average value of a tree is the sum of its values, divided by the number of nodes.) ...
size_left_subtree=inorder_root-inorder_left;// 递归地构造左子树,并连接到根节点// 先序遍历中「从 左边界+1 开始的 size_left_subtree」个元素就对应了中序遍历中「从 左边界 开始到 根节点定位-1」的元素root.left=myBuildTree(preorder,inorder,preorder_left+1,preorder_left+size_left_subtree,...
LeetCode-Maximum Binary Tree Description: Given an integer array with no duplicates. A maximum tree building on this array is defined as follow: The root is the maximum number in the array. The left subtree is the maximum tree constructed from left part subarray divided by the maximum number...
0040 Combination Sum II LeetCode 力扣 Python CSDN Medium 回溯 0046 Permutations LeetCode 力扣 Python CSDN Medium 回溯 0047 Permutations II LeetCode 力扣 Python CSDN Medium 递归、回溯 0051 N-Queens LeetCode 力扣 Python CSDN Hard 回溯 0053 Maximum Subarray LeetCode 力扣 Python CSDN Easy 动态规划 00...
2461.Maximum-Sum-of-Distinct-Subarrays-With-Length-K (M) 2537.Count-the-Number-of-Good-Subarrays (M+) 3298.Count-Substrings-That-Can-Be-Rearranged-to-Contain-a-String-II (M+) 3306.Count-of-Substrings-Containing-Every-Vowel-and-K-Consonants-II (H-) Two pointers for two sequences 986...
124 Maximum Path Sum 508 Most Frequent Subtree Sum 814 binary-tree-pruning 687 Longest Univalue Path 671 Second Minimum Node In a Binary Tree 都是一个套路 层序遍历 层序遍历,或者说BFS,相关题目都不是很难,而且相当一部分还可以用DFS做 102 二叉树标准的层序遍历 103 层序遍历 107 层序遍历 429 n...
left(NULL), right(NULL) {} * }; */ class Solution { public: bool isSymmetric(TreeNode* root) { if(root==NULL) return true; if(root->left==NULL || root->right==NULL) return root->left == root->right; stack<TreeNode*> nodeStack; TreeNode* leftSubTree,...