Compilare: user.cpp: In function ‘void desc(long long int)’: user.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<d.size();++i) ~^~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:55:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<d.size();++i) ~^~~~~~~~~