Introduction - If you have any usage issues, please Google them yourself
[imported] map of the number of vertices N, Vertex map of the relationship between the starting point and end point A and B [output] if A to B without path then exporting "There is no path" Otherwise output A to B on the path vertices [storage structure] plan adopted adjacency matrix of storage. [Algorithm for the basic idea] BFS way from the vertex A, A visit followed with adjacent vertices VA1, VA2 ,..., VAK, visiting times, if not visit B, continue to visit with the VA1 adjacent vertices VA11, VA12 ,..., VA1M. VA2 and then visit the adjacent vertices ... and so on until finding B, the first to reach point B path, must be at least a few side paths. Queue used to achieve record was visited by the vertex. Each visit with the team atop the points are adjacent to the vertex, then t