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0 N% s' K I; f, z; P公仔箱論壇# U+ l+ M0 D1 m. S6 [5 }) M: {' V# q& B7 ~) _4 D, K6 \
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。) c! R0 t4 P9 T. m
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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6 t. c$ O( z& T6 S* L& Z- z
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! |