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POJ3662 Telephone Lines (dijkstra+二分)
Farmer John wants to set up a telephone line at his farm. Unfortunately, the phone company is uncooperative, so he needs to pay for some of the cables ...
分类:其他好文   时间:2020-02-11 09:45:17    阅读次数:72
138. Copy List with Random Pointer
Problem : A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null. Return a ...
分类:其他好文   时间:2020-02-09 11:54:41    阅读次数:76
To Buy or Not to Buy - Hard Version
Eva would like to make a string of beads with her favorite colors so she went to a small shop to buy some beads. There were many colorful strings of b ...
分类:其他好文   时间:2020-02-09 00:38:57    阅读次数:93
Java学习十八
学习内容: 1.Java集合 1.自定义的set类添加重复数据需要在实体类中添加hashcode和equals方法。 2.查找set对象信息(以宠物猫为例) //在集合中查找花花的信息并输出 if(set.contains(huahua)){ system.out.println("花花找到了!") ...
分类:编程语言   时间:2020-02-05 23:36:44    阅读次数:97
leetcode 1 两数之和
int [] two_num(int [] nums,int target){ HashMap<Integer, Integer> num_indx = new HashMap<Integer, Integer>(); int [] ans = new int [2]; for(int i=0;i< ...
分类:其他好文   时间:2020-02-05 18:42:01    阅读次数:60
551. Student Attendance Record I
You are given a string representing an attendance record for a student. The record only contains the following three characters: 'A' : Absent. 'L' : L ...
分类:其他好文   时间:2020-02-05 09:48:50    阅读次数:45
63.Python中contains和icontains
1. contains: 进行大小写敏感的判断,某个字符串是否包含在指定的字段中,这个判断条件使用大小写敏感进行判断,因此在被翻译成“SQL”语句的时候,会使用“like binary”, 而“like binary”就是使用大小写敏感进行判断。 2. icontains: 进行大小写不敏感的判断, ...
分类:编程语言   时间:2020-02-04 23:36:34    阅读次数:104
7-7 Complete Binary Search Tree (30分)
A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes ...
分类:其他好文   时间:2020-02-04 15:45:09    阅读次数:77
HTTP协议、时间戳、防盗链的一些概念
HTTP协议 什么是HTTP协议 (HyperText Transfer Protocol,超文本传输协议)是因特网上应用最为广泛的一种网络传输协议,所有的WWW文件都必须遵守这个标准。 HTTP是一个基于TCP/IP通信协议来传递数据(HTML 文件, 图片文件, 查询结果等)。 HTTP 工作原 ...
分类:Web程序   时间:2020-02-04 15:35:38    阅读次数:170
解决Mysql5.7以上版本, 使用group by抛出Expression #1 of SELECT list is not in GROUP BY clause and contains no异常
出现原因:MySQL 5.7.5和up实现了对功能依赖的检测。如果启用了only_full_group_by SQL模式(在默认情况下是这样),那么MySQL就会拒绝选择列表、条件或顺序列表引用的查询,这些查询将引用组中未命名的非聚合列,而不是在功能上依赖于它们。(在5.7.5之前,MySQL没有检 ...
分类:数据库   时间:2020-02-02 00:53:01    阅读次数:121
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