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这个该怎么具体做啊？

Posted by 274827185 at 2005-10-14 20:45:41 on Problem 2641 
题目好象只要把每次碰撞的点的位置确定就可以出来了，问题是，我想了半天都不知道该怎么想？
高手指点指点啊？拜托了！
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