Problem description Mad scientist Mike entertains himself by arranging rows of dominoes. He doesn't need dominoes, though: he uses rectangular magnets ...
分类：
Web程序 时间：
2018-06-10 11:42:10
阅读次数：
225
题目描述 JSZKC is going to spend his vacation! His vacation has N days. Each day, he can choose a T-shirt to wear. Obviously, he doesn’t want to wear a si ...
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其他好文 时间：
2018-06-08 20:41:15
阅读次数：
691
题目描述 JSZKC is going to spend his vacation! His vacation has N days. Each day, he can choose a T-shirt to wear. Obviously, he doesn’t want to wear a si ...
分类：
其他好文 时间：
2018-06-05 23:22:55
阅读次数：
189
Problem description Petya loves lucky numbers. Everybody knows that positive integers are lucky if their decimal representation doesn't contain digits ...
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其他好文 时间：
2018-06-01 20:41:17
阅读次数：
237
Petr stands in line of n people, but he doesn't know exactly which position he occupies. He can say that there are no less than a people standing in f ...
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其他好文 时间：
2018-05-26 21:25:21
阅读次数：
160
A tree is a connected graph that doesn't contain any cycles. The distance between two vertices of a tree is the length (in edges) of the shortest path ...
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其他好文 时间：
2018-05-24 16:35:24
阅读次数：
184
1、异常提示：Cause: java.sql.SQLException: Column count doesn't match value count at row 1 ; bad SQL grammar []; nested exception is java.sql.SQLException: ... ...
分类：
数据库 时间：
2018-05-20 15:30:43
阅读次数：
201
hibernate 插入数据错误：Caused by: java.sql.SQLException: Field 'id' doesn't have a default value 无法插入数据； 错误原因： id在数据库表中是作为主键，但是在插入的过程中，没有给予数值，并且没有让其自增 解决办法： ...
分类：
数据库 时间：
2018-05-19 23:25:37
阅读次数：
256
前言 最新下了个最新版的夜神模拟器，然后adb devices发现连不上模拟器了，报adb server version (36) doesn’t match this client (39); killing…从报错信息看是adb版本不匹配导致的，接下来讲如何解决这个问题 环境：夜神模拟器 6.0 ...
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移动开发 时间：
2018-05-13 23:10:32
阅读次数：
431
使用gevent实现mysql并发时，每个greenlet应该独享一个mysql连接，否则，不同的greenlet之间会相互影响。 ultramysql doesn't allow you to make multiple queries on the same mysql connection, ...
分类：
数据库 时间：
2018-05-08 14:42:52
阅读次数：
191
