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腾讯课堂——基础数据类型(set集合)
认识集合 由一个或多个确定的元素所构成的整体叫做集合。 集合中的元素有三个特征: 1.确定性(集合中的元素必须是确定的) 2.互异性(集合中的元素互不相同。例如:集合A={1,a},则a不能等于1) 3.无序性(集合中的元素没有先后之分),如集合{3,4,5}和{3,5,4}算作同一个集合。 集合概 ...
分类:其他好文   时间:2019-09-16 19:12:21    阅读次数:112
JDBC连接时出现的问题总结
java.sql.SQLException: The server time zone value '?й???????' is unrecognized or represents more than one time zone. You must configure either the ser ...
分类:数据库   时间:2019-09-14 16:36:40    阅读次数:127
leetcode 63. Unique Paths II
A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any p ...
分类:其他好文   时间:2019-09-14 00:17:29    阅读次数:98
hdu1710 二叉树
Binary Tree Traversals Problem Description A binary tree is a finite set of vertices that is either empty or consists of a root r and two disjoint bin ...
分类:其他好文   时间:2019-09-13 17:43:06    阅读次数:84
[虚拟机OA]Climb the hill 爬山
Jack was trying to go up the hill. He does not have any problem in climbing up or coming down the hill if the slope is consistently either increasing ...
分类:其他好文   时间:2019-09-12 09:58:27    阅读次数:101
pat 1003 Universal Travel Sites (35 分)
After finishing her tour around the Earth, CYLL is now planning a universal travel sites development project. After a careful investigation, she has a ...
分类:其他好文   时间:2019-09-11 11:44:15    阅读次数:624
Error: Could not open client transport with JDBC Uri: jdbc:hive2://localhost:10000: java.net.ConnectException: 拒绝连接 (Connection refused) (state=08S01,code=0)
一:启动hiveserver2服务 二:启动beeline 三:连接hiveserver2(下面的1000000端口号适当改小写因为其超出最大端口号的范围建议改为10000) 如果启动不成功实现我们先检查以下两个文件配置是否正确 1)hadoop文件夹下面的core-site.xml中的内容 2)h ...
分类:数据库   时间:2019-09-05 23:31:48    阅读次数:333
org.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application
编程中遇到:org.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files dep ...
分类:移动开发   时间:2019-09-03 14:49:35    阅读次数:119
【满k叉树】Perfect Tree
题目描述 Given a positive integer k, we define a rooted tree to be k-perfect, if and only if it meets both conditions below:?Each node is either a leaf no ...
分类:其他好文   时间:2019-09-01 10:44:51    阅读次数:113
(Easy) Reach a Number - LeetCode
Description: You are standing at position 0 on an infinite number line. There is a goal at position target. On each move, you can either go left or ri ...
分类:其他好文   时间:2019-09-01 10:26:11    阅读次数:105
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