Compilare: user.cpp: In function ‘long long int pinex(int, int)’: user.cpp:17:24: warning: unused variable ‘prod’ [-Wunused-variable] long long ans = 0, prod; ^ user.cpp: In function ‘int main()’: user.cpp:34:29: warning: variable ‘aux’ set but not used [-Wunused-but-set-variable] int n, k, i, j, ns, nr, aux, last; ^ user.cpp:32:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suman.in", "r", stdin); ^ user.cpp:33:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suman.out", "w", stdout); ^ user.cpp:36:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ user.cpp:38:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^