Compilare: user.cpp: In function ‘int diametru()’: user.cpp:23:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++) ^ user.cpp:29:23: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] return 2*(len[last]-1); ^