Compilare: user.c: In function ‘main’: user.c:10:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ssm.in", "r", stdin); ^ user.c:11:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ssm.out", "w", stdout); ^ user.c:12:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.c:14:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", S + i); ^ user.c:23:48: warning: ‘idx’ may be used uninitialized in this function [-Wmaybe-uninitialized] best = S[i] - min, besti = i, minj = idx + 1; ^