数据结构作业4：以数偶的形式依次从键盘上输入一串数据。如：(A，B)为从起始结点（其数据场之值为一大写的英文字母 A ），到终止结点（其数据场之值为一大写的英文字母 B）的无向边。最后输入（Z，Z）表示输入结束。请用无向图的邻接多重表存储该无向图，并注意一定要使用动态存储结构。-Data Structure Assignment 4: The order of a few even in the form of a string of data input from the keyboard. Such as: (A, B) from the initial nodes (the data field of the value of an uppercase letter A), to the end nodes (the data field of the value of an uppercase letter B), without the side . Last input (Z, Z) represents the input end. Please undirected adjacency multiple tables to store the graph, and note that we must use dynamic storage structure.