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[CodeForce721C]Journey
题目描述 Recently Irina arrived to one of the most famous cities of Berland — the Berlatov city. There are n showplaces in the city, numbered from 1 to n ...
分类:其他好文   时间:2018-12-30 17:28:57    阅读次数:179
103. Binary Tree Zigzag Level Order Traversal - Medium
Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and ...
分类:其他好文   时间:2018-12-29 11:09:36    阅读次数:121
Dependency injection in ASP.NET Core
原文 ASP.NET Core supports the dependency injection (DI) software design pattern, which is a technique for achieving Inversion of Control (IoC) between ...
分类:Web程序   时间:2018-12-28 12:02:26    阅读次数:258
ORA 01810 格式代码出现两次的error
列如: select * from goods where g_time between to_date('2018/12/26 10:01:59','yyyy-MM-dd hh:mm:ss') and to_date('2018/12/26 10:05:17',' yyyy-MM-dd hh:mm ...
分类:其他好文   时间:2018-12-27 18:32:07    阅读次数:172
sqlserver 优化建议
1. 应尽量避免在 where 子句中使用!=或<>操作符,否则将引擎放弃使用索引而进行全表扫描。 2.对查询进行优化,应尽量避免全表扫描,首先应考虑在 where 及 order by 涉及的列上建立索引。 3.应尽量避免在 where 子句中对字段进行 null 值判断,否则将导致引擎放弃使用索 ...
分类:数据库   时间:2018-12-27 00:30:15    阅读次数:156
mapbox.gl文字标注算法基本介绍
Well-placed labels can be the difference between a sloppy map and a beautiful one. Labels need to clearly identify features without obscuring the map. ...
分类:编程语言   时间:2018-12-26 20:10:10    阅读次数:428
python Console menu
I just finished a demo which is to provide an easy way to control hardware resources of A sample. The communication between PC and A sample is UART. T ...
分类:编程语言   时间:2018-12-26 15:54:43    阅读次数:439
php开发过程中的时间问题
开发过程中 经常遇到时间问题,这个要仔细分析,主要跟找准参照物。 比如这段 实际项目中用到的参照物选择今天的时间 用笔在纸上画一条直线,画2个点 第一个点是当前时间,第二个点是7天后的时间 然后判断enddate 在这2个点的左边,还是中间,还是右边 思路就很清晰~以后做到这样的问题 就很简单了~~ ...
分类:Web程序   时间:2018-12-24 16:18:46    阅读次数:202
Java 8 – Period and Duration examples
Few examples to show you how to use Java 8 Duration, Period and ChronoUnit objects to find out the difference between dates. 1. Duration Example A jav ...
分类:编程语言   时间:2018-12-22 19:37:24    阅读次数:150
mysql实践(六)
条件: select * from test where nid > 3; select * from test where nid between 3 and 6; select * from test where nid in (1,2,4,5); select * from test wher ...
分类:数据库   时间:2018-12-22 16:28:58    阅读次数:199
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