Compilare: user.cpp: In function ‘int main()’: user.cpp:13:10: warning: unused variable ‘j’ [-Wunused-variable] {int n,i,j,pn,xx,yy,rz,nr=0; ^ user.cpp:13:12: warning: unused variable ‘pn’ [-Wunused-variable] {int n,i,j,pn,xx,yy,rz,nr=0; ^ user.cpp:13:15: warning: unused variable ‘xx’ [-Wunused-variable] {int n,i,j,pn,xx,yy,rz,nr=0; ^ user.cpp:13:18: warning: unused variable ‘yy’ [-Wunused-variable] {int n,i,j,pn,xx,yy,rz,nr=0; ^ user.cpp:13:21: warning: unused variable ‘rz’ [-Wunused-variable] {int n,i,j,pn,xx,yy,rz,nr=0; ^