Compilare: user.cpp: In function ‘int main()’: user.cpp:262:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < biconnected_components.size(); ++ i) { ^ user.cpp:306:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans_nodes.size(); ++ i) ^ user.cpp:307:65: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] cout << ans_nodes[i] << " \n"[i == (ans_nodes.size() - 1)]; ^