Compilare: user.cpp: In function ‘int main()’: user.cpp:10:15: warning: unused variable ‘i’ [-Wunused-variable] long long i, j, a, b, x, y, k, d; ^ user.cpp:10:18: warning: unused variable ‘j’ [-Wunused-variable] long long i, j, a, b, x, y, k, d; ^ user.cpp:10:33: warning: unused variable ‘k’ [-Wunused-variable] long long i, j, a, b, x, y, k, d; ^ user.cpp:14:15: warning: unused variable ‘c’ [-Wunused-variable] long long c; ^