Compilare: user.cpp: In function ‘int codif(int)’: user.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v.size(); ++i) ^ user.cpp:26:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == v.size()) w.push_back(k); ^ user.cpp: In function ‘void compute_states()’: user.cpp:73:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v.size()-1; ++i) ^