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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  L1 Y# O- V3 W; I( _9 d公仔箱論壇210.6.90.151  H; Y- n+ `4 E" w$ ^, E5.39.217.77:8898; _. P& @( z8 g
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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。
! Q1 n( `% }% C0 O" N5.39.217.77:8898
) S" y% Y7 G! N" k4 S9 {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!  
/ U0 Y5 h1 c  V2 l" }) a公仔箱論壇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

You make a wrong answer! please give me your money!
' k2 T2 V( P3 }9 s5 Z" @1 D   I want to up grade.  I give you my right answers.!