请教：Counting-off Puzzles

这样的问题有规律可寻吗？

25 people are standing in ca circle. Starting with person 1, they count off from 1 to 7 and them start over with 1. Each person who says"7" drops out of the circle. who is the last person left?

所有跟帖： 

• 回复：请教：Counting-off Puzzles -大财主- ♂ (9 bytes) () 06/19/2012 postreply 13:42:59

• 15 -jinjing- ♀ (0 bytes) () 06/19/2012 postreply 16:53:08

• Recursive formula : f(m+1)=7+f(m)-(m+1)*[(7+f(m))/(m+1)] -jinjing- ♀ (51 bytes) () 06/21/2012 postreply 11:45:34

• m>7. f(m) : last number for m. f(1)=1,f(2)=2,...,f(7)=5, ..., -jinjing- ♀ (98 bytes) () 06/21/2012 postreply 12:04:10

• should be f(m+1)=7+f(m)-(m+1)*[(6+f(m))/(m+1)],f(25)=15. -jinjing- ♀ (0 bytes) () 06/23/2012 postreply 08:56:33

• 谢谢各位。子女坦的大侠们给编了code。答案是15。 -bangbang9814- ♀ (0 bytes) () 06/25/2012 postreply 15:48:15

• 回复：请教：Counting-off Puzzles -wxczcbm- ♂ (1689 bytes) () 07/11/2012 postreply 18:26:19

• 很好,...,加一说明更好: m mod m=m. ... -jinjing- ♀ (0 bytes) () 07/11/2012 postreply 20:07:00