Why do people do this(graphs)?

Правка en1, от iamdumb, 2015-07-29 16:54:28

I have seen many time people starting dfs with starting node -1 but I don't understand why do they do this.Can you please tell me why do they do so like in this example.

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en1 Английский iamdumb 2015-07-29 16:54:28 227 Initial revision (published)