#include <iostream>
#include <cstdlib>
using namespace std;

class City {

    public:

    string x;    // x = name
    int pop;    // pop = population
    float area;  //area of cities in SqKm.

    City(){
       x = "noname";
       pop = 0;
       area = 0.0f;
       }

       cityDetails(){
        cout<<"Name of City?"<<endl;
        cin>>x;
        cout<<"Population of the city?"<<endl;
        cin>>pop;
        cout<<"Area of the city in SquareKilometres?"<<endl;
        cin>>area;
       }



};
class Neighbor {
public:

    int y ,*d, i;  // y = no. of neighbors;  d = distance to neighbors; i = index of neighbors;


    Neighbor(){
    y = 0;
    d = 0;
    i = 0;
    }
};

class Graph {
public:

    int v;
    City *cities;
    Neighbor *neighbors;
    Graph(){
    }

    void createGraph(){
        cout<<"How many cities?"<<endl;
        cin>>v;
        City c;
     for(int i=0; i<v; i++){
        cout<<"Enter details of "<<i+1<<"-th city: "<<endl;
        cities[i].cityDetails();
     }
}
    void printGraph()
    {
   /*
    queue int q;
    color[start]=1;
    q.push(start);

    while(!q.empty())
    {
   	 int u = q.front();
   	 cout<<"Visited:"<<u<<"\n";
   	 q.pop();

   	 for(int i=0;i<g[u].size();i++)
   	 {
   	 	int neighbor = g[u][i];

   		 if(color[neighbor]==0)
   		 {
   			 q.push(g[u][i]);
   			 color[neighbor]=1;
   		 }
   	 }
   	 color[u] = 2; // u becomes BLACK
    }
    */
}






    friend istream& operator>>(istream&, Graph &g);
    friend ostream& operator<<(ostream&, Graph &g);
    friend Graph operator++(Graph& G, int);

};

ostream &operator << (ostream &output, Graph &g){
output<<g.displayGraph()<<endl;
return output;
}

istream &operator >> (istream &input, Graph &g){
input>>g.createGraph();
return input;
}
Graph operator++ (Graph&, int){

}

Graph operator+= (Graph&, int){

}


int main()
{
Graph g;
    cin>>g;
    cout<<g;
    G++;
    City cityObj;
 cout<<”Specity a new City: “; cin>>cityObj;
 G += cityObj;
 string cityName; City *neighborPtr; int n;
 cout<<”Enter a City name: “; cin>>cityName;
 getNeighborsOfcityName(g, cityName, neighborPtr, n);
 int totalPopulation=0;

        for(i=0;i<n;i++){
            totalPopulation += neighborPtr[i];
                cout<<”Total population of the neighbors of ”<<cityName<<” is: ”<< totalPopulation<<endl;
 }

return 0;
}