给定一个计算机网络以及机器间的双向连线列表，每一条连线与允许两端的计算机进行直接的文件传输，其他计算机间若存在一条连通路径，也可以进行间接的文件传输。-Given a computer network and machine between the two-way link list, each line and allows the ends of the computer direct file transfer between computers, other if there is a communication path, can also be indirect file transfer.