Compilare: user.c: In function ‘main’: user.c:31:21: warning: value computed is not used [-Wunused-value] ++len > max_len && (max_len = len); ^ user.c:20:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, max_len = 0, len = 0; ^ user.c:17:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("sport.out", "w", stdout); ^ user.c:22:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.c:24:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &A[i]), ^