How to represent graph list in c++

gistfile1.txt

#include <iostream>
#include <vector>
#include <set>

using namespace std;

#define MAX 10000

vector <int> edges[MAX];
vector<int>cost[MAX];
set<int> s;

int main()
{

    int N,E,i;
    cin>>N>>E;

    for(int i=0;i<E;i++){

       int x,y;
       cin>>x>>y;
       s.insert(x);
       edges[x].push_back(y);

    }
    set< int > :: iterator it;

    for(it = s.begin(); it != s.end(); it++){
        cout<<*it<<"==";
        for(int j=0;j<edges[*it].size();j++){

        cout<<edges[*it][j]<<" ";

    }
    cout<<endl;

}

    return 0;
}