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这道题要怎么做？

Posted by mljack at 2006-08-10 23:52:44 on Problem 1921 
感觉如果硬来的话，直线间的求交次数会很多，但是看大家提交的超时的很少，难道真是这样？
别的方面没什么思路，需要从哪方面入手，哪位给指条路？谢了谢了
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