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("distincte2.in","r",stdin),freopen("distincte2.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:40: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("distincte2.in","r",stdin),freopen("distincte2.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:77: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("distincte2.in","r",stdin),freopen("distincte2.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~ main.c:7:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x),a[x]=1; ^~~~~~~~~~~~~~ main.c:11:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&i),printf("%d\n",b[i]-b[x-1]); ^~~~~~~~~~~~~~~~~~~