Compilare: user.cpp: In function ‘int main()’: user.cpp:17:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<adv.size();i++) ^ user.cpp:13:9: warning: unused variable ‘okk’ [-Wunused-variable] int okk=1,i,x,y; ^ user.cpp:13:17: warning: unused variable ‘x’ [-Wunused-variable] int okk=1,i,x,y; ^ user.cpp:13:19: warning: unused variable ‘y’ [-Wunused-variable] int okk=1,i,x,y; ^