# 递归翻转左右子树 self.invertTree(root.left) self.invertTree(root.right) returnroot 以上代码使用了递归的思想,首先判断当前节点是否为空,如果为空则返回 None。否则,交换当前节点的左右子树,然后递归调用 invertTree 函数翻转左右子树。最后返回当前节点作为新的根节点。
-100 <= Node.val <= 100 下面是具体的 Python 代码实现: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 classSolution: defisSymmetric(self, root: TreeNode)->bool: defisSymmetricHelper(left: TreeNode, right: TreeNode)->bool: ifnotleftandnotright: returnTrue elifnotleftornotright: retu...
https://leetcode.com/problems/validate-stack-sequences/ find out an element in the given sorted row and coloumn matrix. https://leetcode.com/problems/linked-list-cycle/ Top view of a binary Tree psuedo code for Topological sort Again two interviewers started from intro and explain one of yo...
之后,我们返回 items 列表中的前 k个元组的key即可。 3 Python 解题代码 其实小根堆也可以结合 Counter 字典(官方解法一:哈希表+排序),所以我们先演示 Counter。 3.1 Counter - 哈希表+排序 解题代码 ## LeetCode 692E - The K Frequent Word - Counter,字典数据结构fromtypingimportListfromcollectionsimportCoun...
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LeetCode爬楼梯Climbing Stairsi++文章分类后端开发 假设你正在爬楼梯。需要 n 阶你才能到达楼顶。 每次你可以爬 1 或 2 个台阶。你有多少种不同的方法可以爬到楼顶呢? 注意:给定 n 是一个正整数。 示例1: 输入: 2 输出: 2 解释: 有两种方法可以爬到楼顶。
leetcode 1008 Construct Binary Search Tree from Preorder Traversal 1.题目描述 2.解题思路 3.Python代码 1.题目描述 返回与给定先序遍历 preorder 相匹配的二叉搜索树(binary search tree)的根结点。 (回想一下,二叉搜索树是二叉树的一种,其每个节点都满足以下规则,对于 node.left 的任... ...
Check the consistency of the numbers (Trie Data Structure Question) Constructing the Array Range Minimum Query PPATH - Prime Path Problem Leetcode Problem Solution Count Number of Nodes in a Complete Binary Tree (Leetcode Problem Solution)
6700 850 147 11 months ago gobot/193 Golang framework for robotics, drones, and the Internet of Things (IoT) 6694 639 25 a month ago cheat/194 cheat allows you to create and view interactive cheatsheets on the command-line. It was designed to help remind *nix system administrators of ...