Compilare: user.c: In function ‘main’: user.c:5:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("qtri.in","r",stdin),freopen("qtri.out","w",stdout),scanf("%d",&n); ^ user.c:5:41: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("qtri.in","r",stdin),freopen("qtri.out","w",stdout),scanf("%d",&n); ^ user.c:5:70: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("qtri.in","r",stdin),freopen("qtri.out","w",stdout),scanf("%d",&n); ^ user.c:7:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d%d%d",&a,&b,&c,&d,&e,&f,&g,&h),printf("%s\n",C(g,h,a,b,c,d,e,f)&&C(g,h,c,d,e,f,a,b)&&C(g,h,e,f,a,b,c,d)?"DA\n":"NU\n"); ^