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4 A2 ]+ e- }, m4 E+ h) ~6 u公仔箱論壇答案: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。9 f4 i" \. A" V- \; q, Q
0 M. T3 T. [' w' M# m6 M7 @3 ACan you make sure that is only 2 or 4 or 6......... to open the lamp? otherwise, the others do not know what station of the lamp! ( v9 M5 F( p' ?6 J0 h: C: T
please see: jar 2009-01-07 my option: all can see and say the lamp is "on" that can sure everyboby have been to the gardon! |