图的搜索（遍历）算法是图型结构相关算法的基础，编写程序演示无向图三种典型存储结构的建立和（搜索）遍历过程。(The search (or traversal) algorithm of the graph is the basis of graph-structure-related algorithms. The program is written to demonstrate the establishment and (search) traversal process of the three typical storage structures of undirected graphs.)