Compilare: user.cpp: In function ‘bool OK(int)’: user.cpp:29:18: warning: unused variable ‘i’ [-Wunused-variable] int l0 = -1, i, y; ^ user.cpp: In function ‘int main()’: user.cpp:53:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:59:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^