参考:https://leetcode.com/discuss/72685/share-my-java-2-d-binary-indexed-tree-solution Build binary indexed tree takes :O(mn*logm*logn)time, bothupdate()andgetSum()take:O(logm*logn)time.Thearr[][]is used to keep a backup of thematrix[][]so that we know the difference of the upda...
1/**2* Definition for binary tree3* struct TreeNode {4* int val;5* TreeNode *left;6* TreeNode *right;7* TreeNode(int x) : val(x), left(NULL), right(NULL) {}8* };9*/10classSolution {11public:12vector<vector<int> > pathSum(TreeNode *root,intsum) {13res.clear();14vector...
Find the number of paths that sum to a given value. The path does not need to start or end at the root or a leaf, but it must go downwards (traveling only from parent nodes to child nodes). The tree has no more than 1,000 nodes and the values are in the range -1,000,000 to...
Given the below binary tree and sum = 22, 5 / \ 4 8 / / \ 11 13 4 / \ / \ 7 2 5 1 return [ [5,4,11,2], [5,8,4,5] ] 这道题就是一个普通的DFS深度优先遍历,不过这里要求到叶子节点,所以这个和二叉树的遍历稍有不同,直接上代码吧! 建议和leetcode 437. Path Sum III 深度...
题目链接:Path Sum II | LeetCode OJ Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. For example: Given the below binary tree and sum = 22, 5 /\ 48 //\ 11134 /\/\ ...
The number of nodes in the tree is in the range [1, 100]. 0 <= Node.val <= 100 All the values in the tree are unique. Note: This question is the same as538 题目描述: 给定一个二叉搜索树 root (BST),请将它的每个节点的值替换成树中大于或者等于该节点值的所有节点值之和。
http://bangbingsyb.blogspot.com/2014/11/leetcode-binary-tree-maximum-path-sum.html http://www.programcreek.com/2013/02/leetcode-binary-tree-maximum-path-sum-java/ 另外,这道题目的BST条件,似乎没什么用。因为如果全是负数,BST也没帮助了。
LeetCode 834.树中距离之和 Sum of distance in tree LeetCode 834.树中距离之和 Sum of distance in tree 题目虽然是hard级的,但是感觉难度其实不高。属于较为基础的树状DPDPDP 首先题目是计算以各点开始的所有距离之和。如果直接计算两点距离。最快的方案是弗洛伊德算法,这是O(N3)O(N^3)O(N3)的,直接...
花花酱 LeetCode 124. Binary Tree Maximum Path SumBy zxi on October 17, 2017Problem: Given a binary tree, find the maximum path sum. For this problem, a path is defined as any sequence of nodes from some starting node to any node in the tree along the parent-child connections. The ...
Given a non-empty binary tree, find the maximum path sum. For this problem, a path is defined as any sequence of nodes from some starting node to any node in the tree along the parent-child connections. The path must contain at least one node and does not need to go through the root...