回复：有一题大家可以试试

来源: 于 2005-01-23 13:06:03 [旧帖] [给我悄悄话] 本文已被阅读：次

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....