Compilare: user.cpp: In function ‘int main()’: user.cpp:13:19: warning: unused variable ‘ct’ [-Wunused-variable] int sum,i,x,n,ct,l,j,cl,r,val,su; ^ user.cpp:13:22: warning: unused variable ‘l’ [-Wunused-variable] int sum,i,x,n,ct,l,j,cl,r,val,su; ^ user.cpp:13:26: warning: unused variable ‘cl’ [-Wunused-variable] int sum,i,x,n,ct,l,j,cl,r,val,su; ^ user.cpp:13:29: warning: unused variable ‘r’ [-Wunused-variable] int sum,i,x,n,ct,l,j,cl,r,val,su; ^ user.cpp:13:35: warning: variable ‘su’ set but not used [-Wunused-but-set-variable] int sum,i,x,n,ct,l,j,cl,r,val,su; ^