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 an arraynumsand a target valuek, find the maximum length of a subarray that sums tok. If there isn't one, return 0 instead. Note: The sum of the entirenumsarray is guaranteed to fit within the 32-bit signed integer range. Example 1: Givennums=[1, -1, 5, -2, 3],k=3, ...
ans, leftLen + RightLen + 1) # Get the longest length of current subtree return max(leftLen, RightLen) + 1 # Start recursion getLength(root) return self.ans - 1 # dplicated length (root node is plused twice) Binary Tree Maximum Path Sum Given a non-empty binary tree, find the ...
输入: 原始二叉搜索树: 5 / \ 2 13输出: 转换为累加树: 18 / \ 20 13思路：倒着的中序遍历class Solution { int sum = 0; public TreeNode convertBST(TreeNode root) { if(root == null) return null; convertBST(root.right); root.val += sum; ...
right_depth = maximum_depth(root.right) 4. return max(left_depth, right_depth) + 1 // return depth of the subtree rooted at root 总结 了解递归并利用递归解决问题并不容易。当遇到树问题时,请先思考一下两个问题: 你能确定一些参数,从该节点自身解决出发寻找答案吗? 你可以使用这些参数和节点本身...
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
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...
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...
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Given a binary tree, find its maximum depth.The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7], 3 / \ 9 20 / \ 15 ...