/in/foo.cc: In function 'int main()':
/in/foo.cc:6:13: error: 'l' was not declared in this scope
  while(Q--){l,r;scanf("%d%d",&l,&r);cout<<a[r]-a[l-1];}//shu'chu
             ^
/in/foo.cc:6:15: error: 'r' was not declared in this scope
  while(Q--){l,r;scanf("%d%d",&l,&r);cout<<a[r]-a[l-1];}//shu'chu
               ^