classSolution {publicList<String>binaryTreePaths(TreeNode root) { List<String> results =newArrayList<>();if(root ==null) {returnresults; } binaryTreePath(results,"", root);returnresults; }publicvoidbinaryTreePath(List<String>results, String path, TreeNode cur) {//直接操作字符串if(cur.left ...
Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: 1 / \ 2 3 \ 5 All root-to-leaf paths are: ["1->2->5", "1->3"] 思路:用两个stack<TreeNode*> in , s; in : 记录当前的路径 p , 和vector<int>path 相同,只不过一个记录的是 ...
https://leetcode.com/problems/binary-tree-paths/ 经典题目。就是DFS搜索。注意这个模板,当前node的value_str已经被上一层加过了。不要再在当前function里面加上value_str 注意思考的时候,模拟 “当前node”, “left sub tree” and “right sub tree”. 注意这里用res来收集结果的时候,如果每个path用list来...
Go 语言递归实现 /** * Definition for a binary tree node. * type TreeNode struct { * Val int * Left *TreeNode * Right *TreeNode * } */ func binaryTreePaths(root *TreeNode) []string { var res []string if root == nil { return res } dfs(root, "", &res) return res } fun...
【Leetcode】Binary Tree Paths https://leetcode.com/problems/binary-tree-paths/ 题目: Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: 1 / \ 2 3 \ 5 All root-to-leaf paths are:
right treePathsIn(node.right,rootpath+node.val) /** * Definition for a binary tree node. * type TreeNode struct { * Val int * Left *TreeNode * Right *TreeNode * } */ func binaryTreePaths(root *TreeNode) []string { if root==nil { return []string{} } s:=Solution{} if root...
# class TreeNode: # def __init__(self, val=0, left=None, right=None): # self.val = val # self.left = left # self.right = right class Solution: def binaryTreePaths(self, root: Optional[TreeNode]) -> List[str]: if not root: return [] queue = collections.deque([root]) pat...
LeetCode-257-二叉树的所有路径 二叉树的所有路径 题目描述：给定一个二叉树，返回所有从根节点到叶子节点的路径。说明: 叶子节点是指没有子节点的节点。示例说明请见LeetCode官网。来源：力扣（LeetCode）链接：https://leetcode-cn.com/problems/binary-tree-paths/著作权归领扣网络所有。商业转载请联系官方授权，...
☕ 题目:LeetCode144. 二叉树的前序遍历 (https://leetcode-cn.com/problems/binary-tree-preorder-traversal/) ❓ 难度:简单 📕 描述:给你二叉树的根节点root,返回它节点值的前序遍历。 题目示例 💡 思路: 递归法前序遍历 我们前面看了递归三要素,接下来我们开始用递归法来进行二叉树的前序遍历: ...
257 Binary Tree Paths 24.9% Easy 242 Valid Anagram 39.1% Easy 241 Different Ways to Add Parentheses 30.6% Medium 240 Search a 2D Matrix II 31.4% Medium 239 Sliding Window Maximum 24.8% Hard 238 Product of Array Except Self 39.5% Medium 237 Delete Node in a Linked List 44.0% Easy 236 Lo...