jar

the first man to set the lamp is "off", the others will  say the lampis "off" , then every one  can sure the lamp is "off" , so  100 men have been to the gardon.

jar

I am right!   from 2009-1-6 , I got it!

jar

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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。tvb now,tvbnow,bttvb5 H% a' _& ^: h: k: [/ d8 y0 C
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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1 n  F8 m9 T$ o7 s( g& W
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!

jar

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