[LeetCode] 112. Path Sum 二叉树的路径和 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. Note: A leaf is a node with no children. Example: Given the below binary tree andsum = ...
}//对每个节点遍历求左右两个节点的做大加上本身,然后取最大的值就是maximum path sum了intmaxPathSum(TreeNode *root) {if(!root)return0;inttmpl = INT_MIN, tmpr =INT_MIN;intcur =curMax(root);if(root ->left) tmpl= maxPathSum(root ->left);if(root ->right) tmpr= maxPathSum(root ->...
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 andsum = 22, 5 / \ 4 8 / / \ 11 13 4 / \ \ 7 2 1 1. 2. 3. 4. 5. 6. ...
取其4个值中得最大值作为子树的最大路径和。 classSolution {public:intmaxSum =INT_MIN;intgetMaxSum(TreeNode*root){if(root == NULL)return0;intleftSum = getMaxSum(root->left), rightSum = getMaxSum(root->right);intcurSum = max(root->val, max(root->val+leftSum, root->val+rightSum...
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。 ** 总结: pre-order -> top-down post-order -> bottom-up in-order -> ? level-order -> bfs ...
参见leetcode上其他coder的思路,发现下面这个解法更加简便直接。虽然是top-bottom的解法,复杂度甚至比上面的方法更简单,最糟糕的情况是O(N)。 defhasPathSum(self,root,sum):ifnot root:returnFalseifnot root.leftand not root.rightand root.val==sum:returnTruesum-=root.valreturnself.hasPathSum(root.left...
LeetCode -- Path Sum III分析及实现方法 题目描述: You are given a binary tree in which each node contains an integer value.Find the number of paths that sum to a given value.The path does not need to start or end at the root or
leetcode.com/problems/path-sum-ii/ 1、 先读题,题目是求从根到叶子node,路径上所有数字之和等于sum 的所有路径。 2、先求出从root 到叶子node,所有路径的二维数组,再判断二维数组中那些元素之和等于sum值。 3、用递归深度优先搜索解决,用一个二维数组统计所有路径,一个一维数组保存每一条路径。 4、当...
Posts Tagged ‘pathsum’Learn Python from ChatGPT – 关于backtracking Posted in Uncategorized, tagged backtracking, chatGPT, list, pathsum, python on 4月 4, 2025| Leave a Comment » Leetcode 113. Path Sum II我最初是这么写的:class Solution:...
题目描述: {代码...} connections. The path must contain at least one node and does not needto go through the root. 举例: {代码...}