Compilare: user.c: In function ‘main’: user.c:10:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen ("clmsc.in", "r", stdin); ^ user.c:11:13: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cmlsc.out", "w", stdout); ^ user.c:14:11: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &FirstLength, &SecondLength); ^ user.c:16:15: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &A[i]); ^ user.c:18:15: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &B[i]); ^ user.c:41:34: warning: ‘length’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (int i = length; i != 0; --i) ^