* TreeNode(int x) : val(x), left(NULL), right(NULL) {} * };*/classSolution {public: vector<int> postorderTraversal(TreeNode *root) { vector<int>res; stack<TreeNode *>stk;if(root) stk.push(root); TreeNode*head=root;while( !stk.empty()) { TreeNode*top=stk.top();if(( !t...
方法三:递归方法(C++) 1voidpostOrder(TreeNode* root,vector<int> &res){2if(!root)3return;4postOrder(root->left,res);5postOrder(root->right,res);6res.push_back(root->val);7}89vector<int> postorderTraversal(TreeNode*root) {10vector<int> res={};11if(!root)12returnres;13postOrder(root...
7 * TreeNode(int x) : val(x), left(NULL), right(NULL) {} 8 * }; 9 */ 10 class Solution { 11 public: 12 vector<int> postorderTraversal(TreeNode *root) { 13 if(root==NULL) 14 return v; 15 TreeNode *left=root->left,*right=root->right; 16 postorderTraversal(left); 17 p...
*/voidtraversal(structTreeNode*root,int*countPointer,int*res){if(!root)return;traversal(root->left,countPointer,res);traversal(root->right,countPointer,res);res[(*countPointer)++]=root->val;}int*postorderTraversal(structTreeNode*root,int*returnSize){int*res=malloc(sizeof(int)*110);intcount=...
LeetCode Binary Tree Postorder Traversal 1.题目 Given a binary tree, return thepostordertraversal of its nodes' values. For example: Given binary tree {1,#,2,3}, 1 \ 2 / 3 1. 2. 3. 4. 5. return [3,2,1]....
Given a binary tree, return thepostordertraversal of its nodes' values. For example: Given binary tree{1,#,2,3}, 1 \ 2 / 3 return[3,2,1]. Note:Recursive solution is trivial, could you do it iteratively? 思路 前序遍历 根->左->右 变成 根->右->左 结果再reverse一下 ...
publicList<Integer>preorderTraversal(TreeNoderoot){List<Integer>list=newArrayList<>();if(root==null){returnlist;}Stack<TreeNode>stack=newStack<>();stack.push(root);while(!stack.isEmpty()){TreeNodecur=stack.pop();if(cur==null){continue;}list.add(cur.val);stack.push(cur.right);stack.pu...
The function returns the root of the constructed binary tree. 4. Time & Space Complexity Analysis: 4.1 Time Complexity: 4.1.1 Lists as parameters In each recursive call, theindex()function is used to find the index of the root value in the inorder traversal list. This function has a time...
Example of a Complete Binary Tree Binary Tree Pre-Order Traversal Algorithm We visit the Node first thenRecursivelytraverse the Left Tree and then Right Tree i.e. NLR. 1 2 3 4 5 6 defpreOrder(root):ifrootisNone:returnprint(root.val)# visit NodepreOrder(root.left)preOrder(root.right) ...
3) traversing binary tree 遍历二叉树 例句>> 4) traversing binary tree algorithm 二叉树遍历算法 例句>> 5) postorder traversal 后序遍历 1. A binary tree cannot be reverted to the only binary tree by using the sequence of preorder traversal,inorder traversal,postorder traversalor Node-Degree. ...