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0 k# G( x' J9 V4 H- j公仔箱論壇210.6.90.151 H; Y- n+ `4 E" w$ ^, E公仔箱論壇 @8 A# u1 b% {
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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。
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Can 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! 公仔箱論壇# ^) ]4 K4 e3 C5 H8 P( [0 I
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! |
發表於 2009-1-10 12:57 PM
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from 2009-1-6 , I got it!
