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("vila2.in","r",stdin),freopen("vila2.out","w",stdout),scanf("%d%d",&n,&k); ^ user.c:5:42: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("vila2.in","r",stdin),freopen("vila2.out","w",stdout),scanf("%d%d",&n,&k); ^ user.c:5:72: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("vila2.in","r",stdin),freopen("vila2.out","w",stdout),scanf("%d%d",&n,&k); ^ user.c:7:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",a+i); ^