cpp/first_half/CC.cc CC(const Graph &) , only declare not pass parameter code is ``` CC(const Graph &) : G(G), ccnt(0), id(G.V(), -1) { // fragment error for (int v = 0; v < G.V(); v++) { // cout << "CC in v=" << v << ", id[v]=" << id[v] << endl; if (id[v] == -1) { ccR(v); ccnt++; } } } ```