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There is a ball in a maze with empty spaces and walls. The ball can go through empty spaces by rolling up, down, left or right, but it won't stop rolling until hitting a wall. When the ball stops, …
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[请点击下方图片观看讲解视频](https://www.youtube.com/watch?v=cJdDY4UNTfI)
[Click below image to watch YouTube Video](https://www.youtube.com/watch?v=cJdDY4UNTfI)
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时间过得好快，转眼间三个月的算法训练营就要结束了，通过这三个月的学习，我感觉个人的编程内功加深了，第一次做LeetCode的两数之和的题目就被虐的好惨，连两层嵌套for循环解题的代码都写不出来，曾经以为只要努力了就会有收获，但是没有方向的努力都是低效的和无效的。
自从和覃超老师一起学习算法之后，才知道了想要解决leetcode上面的题目是需要方法的，五毒神掌、不要死磕、和优秀的题解提高代码…
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Given the `root` of a binary tree, calculate the vertical order traversal of the binary tree.
For each node at position `(row, col)`, its left and right children will be at positions `(row + 1, …
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A chess knight can move as indicated in the chess diagram below:
 . ![](https://assets.leetcode.com/uploads/2018/10/30/key…
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Given a singly linked list, determine if it is a palindrome.
Example 1:
Input: 1->2
Output: false
Example 2:
Input: 1->2->2->1
Output: true
Follow up:
Could…
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# 297. 二叉树的序列化与反序列化
## 入选理由
暂无
## 题目地址
[https://leetcode-cn.com/problems/serialize-and-deserialize-binary-tree/](https://leetcode-cn.com/problems/serialize-and-deserialize-binary-tree/…
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A group of friends went on holiday and sometimes lent each other money. For example, Alice paid for Bill's lunch for $10. Then later Chris gave Alice $5 for a taxi ride. We can model each transacti…