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4 D& W2 ?0 s: y6 ~$ E; i. o" f. a公仔箱論壇# U+ l+ M0 D1 m. S6 [5 }) M% B5 P5 }- ^0 a! S v1 L
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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$ W, n% L8 O* ~, `! W/ G1 gCan 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!
' D5 x: x. @2 b# l5.39.217.77please 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!
