回复：有一题大家可以试试

By intuition, the best way is that draw a circle centerd at the current point. Go straightforward 10 along any direction, then walk on the circle. The total is 10 + 2*Pi*10 = 72.8....

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• 回复：回复：有一题大家可以试试 -ohiotogo- ♀ (178 bytes) () 01/23/2005 postreply 13:11:51

• 回复：回复：有一题大家可以试试 -ohiotogo- ♀ (1225 bytes) () 01/23/2005 postreply 13:55:48

• 回复：回复：有一题大家可以试试 -ohiotogo- ♀ (491 bytes) () 01/23/2005 postreply 14:10:56

• 回复：回复：有一题大家可以试试 -ohiotogo- ♀ (617 bytes) () 01/23/2005 postreply 14:44:38

• 回复：回复：回复：有一题大家可以试试 -mathfun- ♀ (234 bytes) () 01/23/2005 postreply 16:28:31

• 反例 -yyyyyyyyyy- ♀ (177 bytes) () 01/24/2005 postreply 09:07:21

• The failure probability=10.24% -yyyyyyyyyy- ♀ (49 bytes) () 01/24/2005 postreply 13:32:47

• 回复：The failure probability=10.24% -mathfun- ♀ (179 bytes) () 01/24/2005 postreply 16:46:21

• 回复：回复：回复：有一题大家可以试试 -CriticalQ- ♀ (309 bytes) () 01/23/2005 postreply 21:04:19

• 回复：回复：回复：回复：not right -jinjing- ♀ (153 bytes) () 01/25/2005 postreply 13:52:12

• 回复：回复：回复：回复：回复：not right -CriticalQ- ♀ (239 bytes) () 01/25/2005 postreply 15:32:41

• right -旗鼓相当- ♀ (318 bytes) () 01/25/2005 postreply 17:07:17

• 回复：回复：回复：回复：回复：回复：You re right -jinjing- ♀ (15 bytes) () 01/25/2005 postreply 19:09:38

• extra discussion -ohioto- ♀ (485 bytes) () 01/23/2005 postreply 14:52:52