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()...
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); ...
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...
1classSolution {23public:4vector<int> inorderTraversal(TreeNode*root) {56vector<int>res;7if( root ==NULL )8returnres;910stack<TreeNode*>stack;11TreeNode* cur =root;12while(cur != NULL || !stack.empty()){1314if(cur !=NULL){15stack.push(cur);16cur = cur->left;17}18else{19cur...
LeetCode Binary Tree Preorder Traversal 先根遍历 题意:给一棵树,求其先根遍历的结果。 思路: (1)深搜法: 1 /** 2 * Definition for a binary tree node. 3 * struct TreeNode { 4 * int val; 5 * TreeNode *left; 6 * TreeNode *right;...
144. Binary Tree Preorder Traversal** https://leetcode.com/problems/binary-tree-preorder-traversal/ 题目描述 Given a binary tree, return thepreorder traversalof its nodes’ values. Example: Input: [1,null,2,3] 1 \
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...
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...
/* A utility function to print preorder traversal of BST */voidpreOrder(struct Node* node){if(node ==NULL)return;printf("%d ", node->data);preOrder(node->prev);preOrder(node->next); } 开发者ID:codechikbhoka,项目名称:codes,代码行数:9,代码来源:DoublyTObst.cpp ...
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...