Compilare: main.c: In function 'main': main.c:43:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("culori3.in","r",stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:44:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("culori3.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:47:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&n); ^~~~~~~~~~~~~~~~