i find one solution that is similar
* U. f k: E! Y( @$ I3 T- _but i can't specify the heavier one is abnormal or the lighter one is abnormal when the case that has only two balls left....tvb now,tvbnow,bttvb% U: V: S4 i0 j" B6 H5 N9 e
maybe there is a better one, let me see sin |