Gets the number of vertices from the input If n <= MAX_VERTICES, fills m with data from file; otherwise signals failure on stream is and sets m size to 0 x 0
What will be an ideal response?
```
istream& operator>> ( istream& is, AdjacencyMatrix& m )
{
int i, j;
is >> m.n >> m.n;
if (is.fail()) {
m.n = 0;
} else if (m.n > MAX_VERTICES) {
is.setstate( ios::failbit );
m.n = 0;
} else {
for (i = 0; i < m.n; ++i)
for (j = 0; j < m.n; ++j)
is >> m.mat[i][j];
if (is.fail()) {
m.n = 0;
}
}
return is;
}
```
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