Compilare: user.cpp: In function ‘int main()’: user.cpp:34:12: warning: unused variable ‘j’ [-Wunused-variable] int n,c,i,j,aux; ^ user.cpp:34:14: warning: unused variable ‘aux’ [-Wunused-variable] int n,c,i,j,aux; ^ user.cpp:37:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("granita.in", "r", stdin); ^ user.cpp:38:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("granita.out", "w", stdout); ^ user.cpp:39:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:41:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld", &a[i], &b[i]); ^