Compilare: user.c: In function ‘main’: user.c:38:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("proc.in","r",stdin); ^ user.c:39:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("proc.out","w",stdout); ^ user.c:40:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%lld",&n,&k,&p); ^ user.c: In function ‘verif’: user.c:23:13: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] b-=x/(2LL*i); ^