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("nrdivunique.in","r",stdin),freopen("nrdivunique.out","w",stdout),scanf("%d",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:41: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("nrdivunique.in","r",stdin),freopen("nrdivunique.out","w",stdout),scanf("%d",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:79: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("nrdivunique.in","r",stdin),freopen("nrdivunique.out","w",stdout),scanf("%d",&n); ^~~~~~~~~~~~~~ main.c:7:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&k,&l); ^~~~~~~~~~~~~~~~~~~