int n;
    cin >> n;
    vector<vector<int>> g(n);
    //vector<vector<int>> gr(n);
    for (int v = 0; v < n; ++v){
        int u;
        cin >> u;
        while (cin >> u && u != -1){
            g[v].push_back(u);
            //gr[u].push_back(v);
        }
    }
    vector<vector<int>> components;
    vector<int> colors(g.size());
    getSCC(g, components, colors);
    printComponents(components);
    vector<set<int>> metaGraph(components.size());
    getMetaGraph(g, colors, metaGraph);
    printMetaGraph(metaGraph);
    return 0;