C++ vector, what does this code mean?

Question

I have this code:

 const int maxnodes = 5000;
 struct Edge 
 {
   int to, rev;
   int f, cap;
 };

 vector g[maxnodes];

This is qui

Answer 1

int nodes = maxnodes, src, dest;

Here nodes, src, dest are all integers where nodes is initialized with maxnodes others are not initialized.

vector g[maxnodes];

As @milleniumbug mentioned g is a C array of vectors:

g[u][j] will give i th element of u th element of array g. As u the element of g is a vector where you can access its members using [] operator.