If you want to read through all your maps in your map (...), you need two different iterators. One for a map <string, int> and one for a map<string, map<string, int> >.
So something like:

C++ Syntax (Toggle Plain Text)

map <string, map <string, int> > foo;
// fill map
map <string, map <string, int> >::iterator outerit;
map <string, int>::iterator innerit;
for (outerit = foo.begin(); outerit != foo.end(); ++outerit){
    for (innerit = outerit->second.begin(); innerit != outerit->second.end(); ++innerit){
        cout << outerit->first << " " <<  innerit->first << " " << innerit->second << "\n";
    }
}

map <string, map <string, int> > foo; // fill map map <string, map <string, int> >::iterator outerit; map <string, int>::iterator innerit; for (outerit = foo.begin(); outerit != foo.end(); ++outerit){ for (innerit = outerit->second.begin(); innerit != outerit->second.end(); ++innerit){ cout << outerit->first << " " << innerit->first << " " << innerit->second << "\n"; } }