Doubt is the greatest enemy.
2015 ACM-ICPC 上海邀请赛 – B题 – hdu – 5237

Problem Description
Mike does not want others to view his messages, so he find a encode method Base64.
Here is an example of the note in Chinese Passport.

mysql命令行备份数据库

MySQL数据库使用命令行备份|MySQL数据库备份命令

约瑟夫环问题

这算是一个非常简单的模拟题。

Java DES简单实现