Question
Given a linked list, remove the nth node from the end of list and return its head.
For example,
Given linked list: 1->2->3->4->5, and n = 2.
After removing the second node from the end, the linked list becomes 1->2->3->5.
Note:
Given n will always be valid.
Try to do this in one pass.
解说
这道题的意思是，如何反向删继续阅读 »
最近做了一个表单，需要提交好多信息和一些图片，后台的同学说要图片随着表单一起提交。那就不能用 ajax 单张上传了~
图片的话，最多可以选8张，选中了的也可以取消掉，因为并没有传到服务器，所以删除很easy。
然后我就想到了可以用 FormData 来做，因为之前好像用过，感觉很方便。
FormData
The FormData interface provides a way to easily construct a set of key/value pairs representing form fields and their values, which can then be easily sent using t继续阅读 »
**对代码不满足，是任何真正有天才的程序员的根本特征。**
Value '0000-00-00' can not be represented as java.sql.Timestamp
在查询MySql数据库某表的timestamp列的时候，发现此异常，问题来源表述如下
1. 先创建一个测试表
sql
create table test.mytest(
id int PRIMARY KEY AUTO_INCREMENT ,
createtime timestamp not null default current_timestamp , --创建时间
updatetime timestamp not null , --更新时继续阅读 »
**对代码不满足，是任何真正有天才的程序员的根本特征。**
Value '0000-00-00' can not be represented as java.sql.Timestamp
在查询MySql数据库某表的timestamp列的时候，发现此异常，问题来源表述如下
1. 先创建一个测试表
sql
create table test.mytest(
id int PRIMARY KEY AUTO_INCREMENT ,
createtime timestamp not null default current_timestamp , --创建时间
updatetime timestamp not null , --更新时继续阅读 »
This blog was sent to openstack-discuss mailing list originaly.
As the official Victoria release is approaching and it has been a long time
silence for Trove in the upstream, I think it's good time for me as the Trove
PTL for the last 3 dev cycles to have a project update. The things that will be
described below have 继续阅读 »
(This article is adapted to the latest version of rvest package.)
A large proportion of R's power should be attributed to the enormous amount of extension packages. Many packages are published to CRAN.继续阅读 »