Compilare: user.cpp: In function ‘int main()’: user.cpp:26:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<d.size();i++) ^ user.cpp:28:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i;j<d.size();j++) ^ user.cpp:17:9: warning: unused variable ‘p’ [-Wunused-variable] int p = b*b; ^