Directed unweighted graph is given with the list of edges. Find the length of the shortest path between the vertices. Use breadth first search. Input The first line contains the number of vertices n. Each next line contains an edge (read till the end of file). The vertices are numbered from 1 to n. Output Print the length of the shortest path from vertex 1 to vertex 4. Sample input 4 13 32 24 21 23 1 4 2 3 Sample output

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