144. Binary Tree Preorder Traversal 提交网址:https://leetcode.com/problems/binary-tree-preorder-traversal/ Total Accepted:118355Total Submissions:297596Difficulty:Medium Given a binary tree, return thepreordertraversal of its nodes' values. For example: Given binary tree{1,#,2,3}, 1 \ 2 / ...
1、访问根结点。 2、先序方式遍历左子树。 3、先序遍历右子树。 简称:根左右 以下图为例进行先序遍历: image.png 遍历过程如下: [A,A left,A right] -->[A,B,B left, B right,C,C left,C right] --->[A,B,D,E,C,F,F left,G] -->[A,B,D,E,C,F,H,G] 理解节点 在对节点TreeNod...
方法一:使用迭代(C++) 1vector<int> preorderTraversal(TreeNode*root) {2vector<int> res={};3if(!root)4returnres;5stack<TreeNode*>s;6TreeNode* cur=root;7while(!s.empty()||cur){8while(cur){9res.push_back(cur->val);10s.push(cur);11cur=cur->left;12}13cur=s.top();14s.pop()...
树的先序遍历。定义一个栈,先压入中间结点并访问,然后依次压入右、左结点并访问。 vector<int> preorderTraversal(TreeNode *root) { vector<int>result; stack<TreeNode *>s; TreeNode*p; p=root; s.push(p);while(!s.empty()) { p=s.top(); result.push_back(p->val);if(p->right != null...
My code: /** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */publicclassSolution{publicList<Integer>preorderTraversal(TreeNoderoot){List<Integer>ret=newArrayList<Integer>();if(r...
def pre_order_traversal(root): if root is None: return [] stack = [root] result = [] while stack: node = stack.pop() result.append(node.val) if node.right: stack.append(node.right) if node.left: stack.append(node.left) return result PreOrder树遍历的优势是可以快速获取树的结构信息...
https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/description/ """ # Definition for a binary tree node. # class TreeNode(object): # def __init__(self, x): # self.val = x # self.left = None # self.right = None class Solution(object): ...
或leetcode 105: https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/ 参与人数:5246 时间限制:1秒 空间限制:32768K 题目描述 输入某二叉树的前序遍历和中序遍历的结果,请重建出该二叉树。假设输入的前序遍历和中序遍历的结果中都不含重复的数字。例如输入前序遍历序列{...
Obviously, cells with no ancestors are the starting point of the graph traversal algorithm. Graph traversal code The parallel code for this example is in source file PreorderOmp.C. The listing below shows the function that used to generate the tasks that perform the cells updates, as well as...
1classSolution {2public:3vector<int> preorderTraversal(TreeNode *root) {45vector<int>result;6stack<TreeNode*>stack;78TreeNode *p =root;910while( NULL != p || !stack.empty())11{12while(NULL !=p)13{14result.push_back(p->val);1516stack.push(p);17p = p->left;18}1920if(!stack...