随机生辰欧拉图，通过深度优先遍历来求欧拉回路-Random birthday Euler diagram, depth-first traversal through the pursuit of Euler circuit

在开发短信发送系统的时候，碰到这样的问题，给指定客户发送生日短信，但是很多客户使用农历生日-Development of the the SMS transmission system when, faced with this problem, send a birthday SMS to designated customers, but many customers use the lunar calendar birthday

This Birthday attack document that tells about birthday attack with example.-This is Birthday attack document that tells about birthday attack with example.

51单片机蜂鸣器播放音乐，C语言控制，包括生日快乐歌，国歌，心太软，老鼠爱大米，-51 single buzzer play music, C language control, including Happy Birthday, national anthem, too soft, Mice Love Rice, etc.