Compilare: user.cpp: In function ‘int main()’: user.cpp:58:27: warning: statement has no effect [-Wunused-value] grad[x] != grad[x]; ^ user.cpp:59:27: warning: statement has no effect [-Wunused-value] grad[y] != grad[y]; ^ user.cpp:46:15: warning: unused variable ‘cnt_impar’ [-Wunused-variable] int x, y, cnt_impar = 0, start = 1; ^ user.cpp:46:30: warning: unused variable ‘start’ [-Wunused-variable] int x, y, cnt_impar = 0, start = 1; ^