The root-to-leaf path1->3represents the number13. Return the sum = 12 + 13 =25. 简单的用递归就可以实现,代码如下: 1classSolution {2public:3intsumNumbers(TreeNode*root) {4dfs(root,0);5}67intdfs(TreeNode * root,intcurr){8if(!root)9return0;10if(!root->left && !root->right)11...
An example is the root-to-leaf path 1->2->3 which represents the number 123. Find the total sum of all root-to-leaf numbers. For example, 1 / \ 2 3 The root-to-leaf path 1->2 represents the number 12. The root-to-leaf path 1->3 represents the number 13. Return the sum =...
Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1->2->3 which represents the number 123. Find the total sum of all root-to-leaf numbers. For ...
=nil{result+=dfs(root.Left,pathSum+root.Left.Val)}// 如果右子结点不为空,则递归处理右子结点ifroot.Right!=nil{result+=dfs(root.Right,pathSum+root.Right.Val)}returnresult} 题目链接: Sum Root to Leaf Numbers : https://leetcode.com/problems/sum-root-to-leaf-numbers/ 求根节点到叶节点数...
The root-to-leaf path1->3represents the number13. Return the sum = 12 + 13 =25. 从根节点開始,dfs的思路,事实上也就是postorder(先序遍历),遍历路径上的值每次乘以基数10,过程非常easy,代码例如以下: classSolution{public:intsum;voiddfs(TreeNode*root,intpre){if(root==NULL)return;intcurrent=roo...
The root-to-leaf path1->2represents the number12. The root-to-leaf path1->3represents the number13. Return the sum = 12 + 13 =25. 思路:本题可以按照先序遍历来求和,对于每个结点,采用 temp = value* 10 + node->val来更新值。注意先序遍历的写法,不要多考虑情况,一开始我加的判断太多了,...
The root-to-leaf path 1->2 represents the number 12. The root-to-leaf path 1->3 represents the number 13. Return the sum = 12 + 13 = 25. 题意:一个二叉树每个节点是一个0-9的数字,从根节点到叶子节点可以看做是一个数字,求所有数字的和。
1 / \ 2 3 The root-to-leaf path 1->2 represents the number 12. The root-to-leaf path 1->3 represents the number 13. Return the sum = 12 + 13 = 25. 递归解法 思路 递归条件是把当前的sum10并且加上当前节点传入下一函数,进行递归,最终把左右子树的总和相加。结束条件是如果到了叶节点 返...
The root-to-leaf path1->3represents the number13. Return the sum = 12 + 13 =25. 题目本身看起来很简单的,但是如果对于对属性结构和递归编程不是那么熟的人来说就会遇到很多细节的问题了。后来参考了网上的一些答案,发现基本上都没有详细解析的,也许高手们不屑去分析吧。倒是LeetCode上还是有分析得挺好...
The root-to-leaf path 1->3 represents the number 13. Therefore, sum = 12 + 13 = 25. Example 2: Input: [4,9,0,5,1] 4 / \ 9 0 / \ 5 1 Output: 1026 Explanation: The root-to-leaf path 4->9->5 represents the number 495. The root-to-leaf path 4->9->1 represents ...