数据结构c++语言描述 Borland C++实现

				out-degree of vertex 1 is 1
				out-degree of vertex 2 is 1
				out-degree of vertex 3 is 2
				out-degree of vertex 4 is 1
				out-degree of vertex 5 is 1
				in-degree of vertex 1 is 0
				in-degree of vertex 2 is 1
				in-degree of vertex 3 is 1
				in-degree of vertex 4 is 2
				in-degree of vertex 5 is 2
				Number of edges is 6