Compilare: main.c: In function 'main': main.c:57:5: 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(); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:57:41: 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(); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:57:79: 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(); ^~~~~~~~~~~~~ main.c:57:93: 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(); ^~~~~~~~~~~~~~ main.c:59:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%s",c),I(t,c,i); ^~~~~~~~~~~~~