Question: 1 - Is there any directed graph ( digraph ) with 5 vertices and 2 1 arcs? 2 - Check if a graph is strongly

1- Is there any directed graph(digraph) with 5 vertices and 21 arcs?
2- Check if a graph is strongly connected by Warshall algorithm.
3- Define a matching in a graph. What is maximal matching, maximum matching, perfect
matching. Is every maximum matching is maximal? What about it is converse?
4- Describe the greedy matching algorithm.
1- Is there any directed graph(digraph) with 5 vertices and 21

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