Compilare: user.c: In function ‘main’: user.c:51:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.in","r",stdin),freopen("ahocorasick.out","w",stdout),scanf("%s",x),scanf("%d",&n),t=V(); ^ user.c:51:48: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.in","r",stdin),freopen("ahocorasick.out","w",stdout),scanf("%s",x),scanf("%d",&n),t=V(); ^ user.c:51:84: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.in","r",stdin),freopen("ahocorasick.out","w",stdout),scanf("%s",x),scanf("%d",&n),t=V(); ^ user.c:51:98: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.in","r",stdin),freopen("ahocorasick.out","w",stdout),scanf("%s",x),scanf("%d",&n),t=V(); ^ user.c:53:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",c),I(t,c,i); ^