Compilare: user.c: In function ‘A’: user.c:22:2: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!r->l[*k]) ^ user.c:23:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] r->l[*k]=V(); ^ user.c:24:2: warning: array subscript has type ‘char’ [-Wchar-subscripts] A(r->l[*k++]); ^ user.c: In function ‘main’: user.c:27:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.in","r",stdin),freopen("ahocorasick.out","w",stdout),fgets(e,1000001,stdin),scanf("%d\n",&n),r=V(); ^ user.c:27:45: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.in","r",stdin),freopen("ahocorasick.out","w",stdout),fgets(e,1000001,stdin),scanf("%d\n",&n),r=V(); ^ user.c:27:81: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.in","r",stdin),freopen("ahocorasick.out","w",stdout),fgets(e,1000001,stdin),scanf("%d\n",&n),r=V(); ^ user.c:27:104: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.in","r",stdin),freopen("ahocorasick.out","w",stdout),fgets(e,1000001,stdin),scanf("%d\n",&n),r=V(); ^ user.c:29:11: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(a,10001,stdin),k=a,A(r); ^