说明：  里面有两个程序一个可以方便改变网络节点连接方向的程序，非常好用，另一个可以生成随机图，对研究网络的性能很有帮助
(There are two programs that can easily change the direction of the program to connect network nodes, very easy to use, one can generate random maps, useful for the study of network performance)