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<int> preorderTraversal(TreeNode *root) {13//IMPORTANT: Please reset any...
leetcode7:binary-tree-preorder-traversal 题目描述 求给定的二叉树的前序遍历。 例如: 给定的二叉树为{1,#,2,3}, 1 \ 2 / 3 返回:[1,2,3]. 备注;用递归来解这道题太没有新意了,可以给出迭代的解法么? /** * struct TreeNode { * int val; * struct TreeNode *left; * struct ...
/** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ class Solution { public: vector<int> preorderTraversal(TreeNode *root) { vector<int> res; stack<TreeNode...
Given the root of an n-ary tree, return the preorder traversal of its nodes' values. Nary-Tree input serialization is represented in their level order traversal. Each group of children is separated by the null value (See examples) 给定一个 n 叉树的根节点 root ,返回 其节点值的 前序遍历...
题目: Given preorder and inorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. 根据前序遍历和中序遍历结果构造二叉树。 思路分析: 分析二叉树前序遍历和中序遍历的结果我们发现: 二叉树前序遍历的第一个节点是根节点。 在中序遍历...
1. 前序遍历: 144. 二叉树的前序遍历递归def preorderTraversal(self, root): res=[] def helper(root): if not root: return res.append(root.val) helper(root.left) helper(root.right) helper(root) return r…
self._preorderTraversal(root, result) return result 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 迭代 1.根节点入栈 2.取出节点,值加入结果,然后先加右,后加左。 3.重复2 注意:就算节点没有孩子,其指向孩子的指针(node.left)是None,不会报错 ...
LeetCode Binary Tree Preorder Traversal 1.题目 Given a binary tree, return thepreordertraversal of its nodes' values. For example: Given binary tree {1,#,2,3}, 1 \ 2 / 3 1. 2. 3. 4. 5. return [1,2,3]....
https://leetcode.cn/problems/construct-binary-tree-from-preorder-and-inorder-traversal/ 给定两个整数数组preorder和inorder,其中preorder是二叉树的先序遍历,inorder是同一棵树的中序遍历,请构造二叉树并返回其根节点。 示例1: 输入: preorder = [3,9,20,15,7], inorder = [9,3,15,20,7] ...
107Binary Tree Level Order Traversal IIC++ 106Construct Binary Tree from Inorder and Postorder TraversalC 105Construct Binary Tree from Preorder and Inorder TraversalC 104Maximum Depth of Binary TreeC 103Binary Tree Zigzag Level Order TraversalC++ ...