Binary Tree Postorder Traversal--leetcode难题讲解系列 https://leetcode.com/problems/binary-tree-postorder-traversal/ 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 tri...
4)直到栈空,遍历结束。 a、下面代码比较常规,与上面分析思路一致 View Code b、下面代码简洁(个人感觉,不喜勿喷) View Code
https://leetcode.com/problems/binary-tree-postorder-traversal/ Constraint: Idea: We could do it either in recursive or iterative way. Code Recursive solution: AI检测代码解析 class Solution { public List<Integer>postorderTraversal(TreeNode root) { List<Integer>results = new ArrayList<>(); traver...
[LeetCode] 590. N-ary Tree Postorder Traversal Given an n-ary tree, return thepostordertraversal of its nodes' values. Nary-Tree input serialization is represented in their level order traversal, each group of children is separated by the null value (See examples). Follow up: Recursive solut...
Additionally, the inorder_index dictionary requires O(n) space, as it stores the index of each value in the inorder traversal list. Overall, the space usage is proportional to the number of nodes in the tree. 编辑于 2024-03-28 17:50・波兰 力扣(LeetCode) 算法 Python...
Given a binary tree, return the postorder traversal of its nodes' values. Example: Input:[1,null,2,3]1\2/3Output:[3,2,1] Follow up: Recursive solution is trivial, could you do it iteratively? Language:Java /** * Definition for a binary tree node. ...
Solution2: Iterative做法 思路: Solution1.a Code: classSolution1{privateHashMap<Integer,Integer>inorder_map=newHashMap<Integer,Integer>();publicTreeNodebuildTree(int[]inorder,int[]postorder){if(inorder==null||postorder==null||inorder.length!=postorder.length)returnnull;// build hashmap from In...
recursive算法比较简单,iterative算法比较难想,可是leetcode原题都说了: recursive method is trivial, could you do iteration? 144.Binary Tree Preorder Traversal /*iterative*/ public List<Integer> preorderTraversal(TreeNode root) { List<Integer> result = new LinkedList<>(); ...
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. ...
Can you solve this real interview question? Construct Binary Tree from Inorder and Postorder Traversal - Given two integer arrays inorder and postorder where inorder is the inorder traversal of a binary tree and postorder is the postorder traversal of th