Compilare: user.cpp: In function ‘int main()’: user.cpp:27:16: warning: unused variable ‘a’ [-Wunused-variable] int o, a, b; ^ user.cpp:27:19: warning: unused variable ‘b’ [-Wunused-variable] int o, a, b; ^ user.cpp: In function ‘void query(int, int, int, int, int)’: user.cpp:51:9: warning: unused variable ‘m1’ [-Wunused-variable] int m1 = 0, m2 = 0; ^ user.cpp:51:17: warning: unused variable ‘m2’ [-Wunused-variable] int m1 = 0, m2 = 0; ^