回複：挑戰：如果帽子的顏色有10種，什麽樣的算法，可以讓被砍頭的人最少？

來源: 於 2010-02-18 06:32:23 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

label the 10 colors 0 to 9. The first guy says the color that is the modulo-10 sum of all the rest. The surviving prob. is 99.1%.