Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:46:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:73:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<BC.size(); ++i) ^ user.cpp:75:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<BC[i].size(); ++j) ^