Writes to the output stream the contents of digraph d , one edge at a time
What will be an ideal response?
```
ostream& operator<< ( ostream& os, const Digraph& d )
{
cout << setw(5) << d.n << endl;
for (int i = 0; i < d.numEdges; ++i) {
cout << setw( 5 ) << d.edges[i][0]
<< setw( 5 ) << d.edges[i][1] << endl;
}
return os;
}
```
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