Compilare: main.c: In function 'main': main.c:13:19: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(i+t<=n) ^ main.c:5:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("aib.in","r",stdin),freopen("aib.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:33: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("aib.in","r",stdin),freopen("aib.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:63: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("aib.in","r",stdin),freopen("aib.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~ main.c:8:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",a+i),a[i]+=a[i-1],j=i-(i&(-i)),c[i]=a[i]-a[j]; ^~~~~~~~~~~~~~~ main.c:10:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^~~~~~~~~~~~~~~~~~~ main.c:20:13: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&z); ^~~~~~~~~~~~~~