答案:选一个囚犯出来负责关灯,其余的负责开灯,而且每人只能开一次,当这个囚犯关够99次的时候,就知道所有的囚犯都来过院子了。tvb now,tvbnow,bttvb4 K8 i$ Q3 a6 `+ Y2 m6 X+ I8 X
8 t) l6 J' n8 ^tvb now,tvbnow,bttvbi don't get it.. how to pick someone to record it.. when there is only 1 person allow to go out each day..and he/she will lock up later |