Compilare: user.c: In function ‘main’: user.c:6:17: warning: unused variable ‘x’ [-Wunused-variable] int n,k,s=0,x; ^ user.c:10:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv2.in","r",stdin); ^ user.c:11:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv2.out","w",stdout); ^ user.c:14:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.c:19:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ user.c:52:11: warning: ‘ult’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d %d",prims+1,ult+1,smax); ^ user.c:52:11: warning: ‘prims’ may be used uninitialized in this function [-Wmaybe-uninitialized]