Compilare: user.cpp: In function ‘int main()’: user.cpp:36:12: warning: unused variable ‘x’ [-Wunused-variable] int n, x, y, d; ^ user.cpp:36:15: warning: unused variable ‘y’ [-Wunused-variable] int n, x, y, d; ^ user.cpp:36:18: warning: unused variable ‘d’ [-Wunused-variable] int n, x, y, d; ^