Compilare: user.cpp: In function ‘int main()’: user.cpp:30:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[v].size();i++) ^ user.cpp:28:33: warning: unused variable ‘d’ [-Wunused-variable] int v=S.begin()->second,d=S.begin()->first; ^