若要在n个城市间建设通信网络，只需要铺设n-1条线路达到每个城市都连通即可。请用C语言编写程序求出以最低经济代价建设这个通信网的方案，存储结构和实现算法由学生自己选定并实现。-N To build communication networks between cities, only paved route to n-1 connectivity to each city. Please use the C programming language in order to find the lo