Graphs question

[mysiarobin1987]

Hi! I am working the assignment below for my Data Structures class and I am getting this error: [Error] expected primary-expression before ')' token. I have commented the line where I am getting the error, as well as provided the contents for the .dat file I am using. Thanks for the help!

Assignment:
Write an interactive program reads the name of cities and distances between them and provides the following functionality:

Given a city, print a list of all of the neighboring cities
Print a list of all cities and their neigbors
Given a city delete the city from the graph
Given a city, find the closest city

.dat file contents:
Norfolk 4 Chesapeake 10 VirginiaBeach 5 Portsmouth 2 Hampton 20
Suffolk 4 Chesapeake 20 Portsmouth 5 NewportNews 30 Windsor 10
Portsmouth 3 Chesapeake 10 Norfolk 2 Suffolk 5
Hampton 2 NewportNews 5 Norfolk 20
VirginiaBeach 2 Norfolk 5 Chesapeake 10
Chesapeake 5 NewportNews 10 Suffolk 20 Portsmouth 10 VirginiaBeach 10 Moyock 20
Williamsburg 1 NewportNews 10
Moyock 1 Chesapeake 20
Windsor 1 Suffolk 10

#include<iostream>
#include<list>
#include<fstream>
#include<string>
using namespace std;

typedef list<string> adj_list;
typedef adj_list :: iterator adj_it;

struct node
{
       string vertex;
       adj_list adj;
};

struct neighbors
{
	string city;
	int distance;
};

typedef list<node> graph;
typedef graph :: iterator g_it;

//build the graph

void build_graph(graph & G)
{
     //cout <<"Entering build_graph "<<endl;
     ifstream infile;
     infile.open("prog4graph.dat");
     node temp;
     int num_adj_nodes;
     string adj_vertex;
     neighbors neighbor;
     while (!infile.eof())
     {
           infile >>temp.vertex;
          // cout << temp.vertex <<endl;
           infile >> num_adj_nodes;
           //cout <<"number of nodes = "<<num_adj_nodes <<endl;
           
           temp.adj.clear();
           for(int i = 0; i < num_adj_nodes; i++)
           {
                   infile >> adj_vertex;
                   infile >> neighbor.city;
                   infile >> neighbor.distance;
                   temp.adj.push_back(neighbors); // Error here
           }
           G.push_back(temp);
     }
     //cout << "Leaving build_graph"<<endl;
}
           

//print the graph

void print_graph(graph G)
{
     for(g_it it = G.begin(); it != G.end();it++)
     {
              cout << it->vertex<<":";
              for(adj_it it1 = it->adj.begin(); it1 != it->adj.end(); it1++)
              {
                         cout << *it1;
              }
              cout <<endl;
     }
} 
              
               
int main()
{
    graph G;
    build_graph(G);
    print_graph(G);
    system("pause");
    return 0;
}           
     

[Repeater]

temp.adj.push_back(neighbors);

neighbors; there's no such variable.