include

include

using namespace std;

class Graph { int V; vector> adj;

public: Graph(int v) { V = v; adj.resize(V); }

void addEdge(int u, int v) {
    adj[u].push_back(v);
    adj[v].push_back(u); // Undirected graph
}

void display() {
    for (int i = 0; i < V; i++) {
        cout << "Node " << i << ": ";
        for (int j : adj[i])
            cout << j << " ";
        cout << endl;
    }
}

};

int main() { Graph g(5); g.addEdge(0, 1); g.addEdge(0, 4); g.addEdge(1, 2); g.addEdge(1, 3); g.addEdge(1, 4); g.display(); }