Compilare: user.cpp: In function ‘void connect(int)’: user.cpp:42:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nodes[node].size(); i++) { ^ user.cpp: In function ‘int main(int, char**)’: user.cpp:87:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sccs.size(); i++) { ^ user.cpp:88:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < sccs[i].size(); j++) ^