Compilare: main.c: In function 'main': main.c:5:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("mincinosi.in","r",stdin),freopen("mincinosi.out","w",stdout),scanf("%d",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:36: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("mincinosi.in","r",stdin),freopen("mincinosi.out","w",stdout),scanf("%d",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:72: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("mincinosi.in","r",stdin),freopen("mincinosi.out","w",stdout),scanf("%d",&n); ^~~~~~~~~~~~~~ main.c:7:8: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",a+i),++b[a[i]]; ^~~~~~~~~~~~~~~