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1原创 206. Reverse Linked List
Reverse Linked ListGiven the head of a singly linked list, reverse the list, and return the reversed list.Example 1:Input: head = [1,2,3,4,5]Output: [5,4,3,2,1]Example 2:Input: head = [1,2]Output: [2,1]Example 3:Input: head = []Output: []Constra
2021-10-12 14:36:05
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原创 21. Merge Two Sorted Lists
Merge Two Sorted ListsMerge two sorted linked lists and return it as a sorted list. The list should be made by splicing together the nodes of the first two lists.Example 1:Input: l1 = [1,2,4], l2 = [1,3,4]Output: [1,1,2,3,4,4]Example 2:Input: l1 = []
2021-10-11 15:06:36
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原创 141. Linked List Cycle
Linked List CycleGiven head, the head of a linked list, determine if the linked list has a cycle in it.There is a cycle in a linked list if there is some node in the list that can be reached again by continuously following the next pointer. Internally, p
2021-10-09 10:22:56
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原创 451. Sort Characters By Frequency
Sort Characters By FrequencyGiven a string s, sort it in decreasing order based on the frequency of the characters. The frequency of a character is the number of times it appears in the string.Return the sorted string. If there are multiple answers, retu
2021-09-27 11:21:46
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原创 387. First Unique Character in a String
First Unique Character in a StringGiven a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1.Example 1:Input: s = “leetcode”Output: 0Example 2:Input: s = “loveleetcode”Output: 2Example 3:In
2021-09-24 17:58:40
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原创 关于自定义Dialog遇到问题
问题1：弹窗的button点击没有响应1、在写自定义Dialog时，整个界面ui完成之后，弹窗也正常弹出，本来觉得成功了，然后在点击事件上翻车了，确认取消使用的button控件，怎么点都没有用，好像点击事件被屏蔽了，经过一顿苦闷的查询，发现在dialog窗体加入Button控件会卡UI，以至于没有响应。解决办法：将我自己原先的这个部分： setContentView(R.layout.dialog);改成：View view = this.getLayoutInflater().inflate
2021-07-20 11:02:12
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原创 window下安装redis服务以及设置密码
window下安装redis服务装个redis，突然发现后台运行和改密码不会，这东西要用的时候疯狂找，记下来好找。安装好redis之后，不能开机自启，可以打开redis-server.exe的窗口启动，但窗口关闭后redis就关闭了步骤：1.打开dos进入redis目录下//安装redis服务2.输入：redis-server --service-install redis.windo...
2020-04-22 10:47:36
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原创 图的操作和应用之景区信息管理系统
信息:现有一个景区，景区里面有若干个景点，景点之间满足以下条件：(1) 某些景点之间铺设了道路（相邻）(2) 这些道路都是可以双向行驶的（无向图）(3) 从任意一个景点出发都可以游览整个景区（连通图）开发景区信息管理系统，对景区的信息进行管理。使用图的数据结构来保存景区景点信息，为用户提供创建图、查询景点信息、旅游景点导航、搜索最短路径、铺设电路规划等功能。(1) 景点信息：景点编号...
2019-03-28 16:54:47
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