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Hefei University of testing six graph data structure, including a complete experimental test requirements, test prep report, final report experimental test requirements: " 1> find edges in a given graph (or arc) number. < 2> solved from a given vertex to all vertices of the shortest path (in order to calculate the number of edges). < 3> to determine whether a directed graph g is a directed tree. (Any vertex may be the root) < 4> on a given graph G and the starting point v0, design algorithm starting from the depth of traversal graph V0 G, and construct the corresponding spanning tree.