Compilare: main.c: In function 'main': main.c:6:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("pinex.in","r",stdin),freopen("pinex.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:32: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("pinex.in","r",stdin),freopen("pinex.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:7:16: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] for(m=N-1,i=2,scanf("%lld",&o);i<=m;++i) ^~~~~~~~~~~~~~~~ main.c:12:7: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] for(scanf("%lld%lld",&x,&y),l=x,k=0,i=1;i*i<=y;++i) ^~~~~~~~~~~~~~~~~~~~~~~