说明：  纯C写的图操作的一些程序,对于初学数据结构的朋友了解图的一些性质有很大帮助.程序很简洁明了,文本选择界面,无图形界面.
(write pure C plans to operate some of the procedures, data structure for the novice friends to understand the nature of the map will be of great help. procedures are clear and concise text selection interface, no graphical interface.)