Compilare: user.cpp: In function ‘int main()’: user.cpp:35:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[X].size();++i){ ^ user.cpp:57:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();++i){ ^ user.cpp:80:22: warning: ‘next’ may be used uninitialized in this function [-Wmaybe-uninitialized] q.push(v[nod][next]); ^