scanf("%c",&ans); }while(ans == 'y'); printf("Inorder traversal:the elements in the tree are"); inorder(root); printf(" Preorder traversal:the elements in the tree are"); preorder(root); printf("Postorder traversal:the elements in the tree are"); postorder(root); ...
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()...
vector<int> preorderTraversal(TreeNode*root) { vector<int>res;if(root ==NULL)returnres; stack<TreeNode*>stack; stack.push(root);while(!stack.empty()){ TreeNode* c =stack.top(); stack.pop(); res.push_back(c->val);if(c->right) stack.push(c->right);if(c->left) stack.push(c...
class Node: def __init__(self, val, children): self.val = val self.children = children"""classSolution:defpreorder(self, root:'Node') ->List[int]:ifnotroot:return[] ans=[root.val]forcinroot.children: ans+=self.preorder(c)returnans...
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]. 解法一: 递归方法: 如果root不为空, 先访问根,递归左子树,递归右子树。
The program creates a binary tree for breadth-first traversal.But i'm trying to use Pre-Order, In-Order, Post-Order Traversal and actually i can't do that. The output of the program is not what i expected. I think i should change the preorder, inorder or postorder functions but i ...
Preorder Traversal: Sample Solution: Java Code: classNode{intkey;Nodeleft,right;publicNode(intitem){// Constructor to create a new Node with the given itemkey=item;left=right=null;}}classBinaryTree{Noderoot;BinaryTree(){// Constructor to create an empty binary treeroot=null;}voidprint_Pre...
【leetcode】非递归先序遍历二叉树(Binary Tree Preorder Traversal),题目描述是这样的:Givenabinarytree,returnthe preorder traversalofitsnodes'values.Forexample:Givenbinarytree {1,#,2,3},1\2/3return [1,2,3].Note: R
vector<int> preorderTraversal(TreeNode*root) { vector<int>res;if(root ==NULL)returnres; stack<TreeNode*>stack; stack.push(root);while(!stack.empty()){ TreeNode* c =stack.top(); stack.pop(); res.push_back(c->val);if(c->right) ...
vector<int> preorderTraversal(TreeNode *root) { vector<int>ivec;if(root) { stack<TreeNode *>tstack; TreeNode*p =root;while(p || !tstack.empty()) {while(p) { ivec.push_back(p->val); tstack.push(p); p= p->left; }if(!tstack.empty()) ...