struct Node
 {
   public:
      Node(int x, Node* node);
   private:
      int mX;
      Node* mNode;
 };

#include <list>
using namespace std;

struct Edge;

struct Node
{
public:
    Node() : m_id(-1) {}
    Node(int id) : m_id(id) {}

    int id() { return m_id; }

    list<Edge*>& get_Edges() { return m_Edges; }

private:
    int m_id;
    list<Edge*> m_Edges;
};

struct Edge
{
public:
    Edge() : m_id(-1), m_weight(0) {}
    Edge(const int id, const int weight) : m_id(id), m_weight(weight) {}

    int id() const { return m_id; }

    int get_weight() const { return m_weight; }
    void set_weight(int weight) { m_weight = weight; }

    Node* get_first_node() { return m_first_node; }
    Node* get_second_node() { return m_second_node; }

    void set_first_node(Node* node) { m_first_node = node; }
    void set_second_node(Node* node) { m_second_node = node; }

private:
    int m_id;
    int m_weight;
    Node* m_first_node;
    Node* m_second_node;
};