/*

实现一个图类，通过增加结点关系而增加结点，通过创建新关系而覆盖旧关系

能在DOS窗口打印图结点列表和结点边列表

初始化的时候 结点表首指针置为NULL，在释放图对象的时候，析构函数实现释放结点和边结点

*/-/* The realization of a map class, by adding nodes to increase the relationship between nodes, through the creation of a new relationship and the relationship between coverage of the old DOS window in the print map node node edge list and a list of initialization when the first node table pointer Purchase to NULL, in the release of chart objects when the destructor to achieve the release node and edge node* /