Compilare: main.c: In function 'main': main.c:5:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("pba.in","r",stdin),freopen("pba.out","w",stdout),scanf("%lld",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:33: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("pba.in","r",stdin),freopen("pba.out","w",stdout),scanf("%lld",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:63: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("pba.in","r",stdin),freopen("pba.out","w",stdout),scanf("%lld",&n); ^~~~~~~~~~~~~~~~ main.c:7:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&x); ^~~~~~~~~~~~~~~~