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@ O1 r, A# v) V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。公仔箱論壇 r& {- c; [3 O
, K, |1 U9 G- f0 O+ G公仔箱論壇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!
9 W: \9 P+ D4 Z2 E! K2 oplease 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! |