否则,我们应访访问当前节点的右孩子(入栈)。 // C++ CODE: classSolution {public: vector<int> postorderTraversal(TreeNode*root) { stack<TreeNode*>s; vector<int>result;while(root){ s.push(root); root= root->left; }while(!s.empty()){ TreeNode* tmp =s.top();if(tmp->right){if(resu...
* TreeNode(int x) : val(x), left(NULL), right(NULL) {} * };*/classSolution {public: vector<int> postorderTraversal(TreeNode *root) { vector<int>perm;if(!root)returnperm; stack<TreeNode *>sta; TreeNode*p = root, *pre =NULL; sta.push(p);while(!sta.empty()) { p=sta.top(...
Leetcode 之Binary Tree Postorder Traversal(44) 后序遍历,比先序和中序都要复杂。访问一个结点前,需要先判断其右孩子是否被访问过。如果是,则可以访问该结点;否则,需要先处理右子树。 vector<int> postorderTraversal(TreeNode *root) { vector<int>result; stack<TreeNode *>s; TreeNode*p, *q;//一个表...
Given a binary tree, return the postorder traversal 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? 本题难度Hard。有3种算法分别是: 递归...
1. Problem Descriptions:Given two integer arrays inorderandpostorderwhereinorderis the inorder traversal of a binary tree andpostorderis the postorder traversal of the same tree, construct and retu…
Construct Binary Tree from Inorder and Postorder Traversal 这道题就是给你两个数组,一个是Inorder traversal,一个是postorder,我之前做过类似的题目,但是还是想不出来,所以参考了自己以前的答案。不过我出发点是没有问题的,就是你要从post最后开始,因为那里是root,这种类型的题目(指的是construct binary tree的...
https://leetcode.com/problems/construct-binary-tree-from-inorder-and-postorder-traversal/ 代码 class Solution{public:TreeNode*buildTree(vector<int>&inorder,vector<int>&postorder){returndfs(inorder,0,inorder.size()-1,postorder,0,postorder.size()-1);}TreeNode*dfs(vector<int>&inorder,intis,in...
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Given a binary tree, return the postorder traversal of its nodes' values. For example: Given binary tree{1,#,2,3}, 代码语言:javascript 代码运行次数:0 1\2/3 return[3,2,1]. Note: Recursive solution is trivial, could you do it iteratively?
链接:https://leetcode.com/problems/construct-binary-tree-from-inorder-and-postorder-traversal/description/ 难度:Medium 题目:106. Construct Binary Tree from Inorder and Postorder Traversal Given inorder and postorder traversal of a tree, construct the binary tree. ...