Compilare: user.c: In function ‘main’: user.c:4:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("regine.in","r",stdin),freopen("regine.out","w",stdout),scanf("%d",&n),m=2*n/3,k=1+n/3,m=(n%3?(m+1):m); ^ user.c:4:40: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("regine.in","r",stdin),freopen("regine.out","w",stdout),scanf("%d",&n),m=2*n/3,k=1+n/3,m=(n%3?(m+1):m); ^ user.c:4:71: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("regine.in","r",stdin),freopen("regine.out","w",stdout),scanf("%d",&n),m=2*n/3,k=1+n/3,m=(n%3?(m+1):m); ^