Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:32:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<V[R.front()].size(); ++i){ ^ user.cpp: In function ‘void problema(int)’: user.cpp:53:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<V[i].size(); ++j) ^ user.cpp:52:5: warning: ‘r’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i=2;i<r;++i) ^