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If you find line a and line b intersect in a point, the line below can be ignore in later's search. So,much less than n^2.

Posted by piaoxing176 at 2005-10-15 01:45:53
In Reply To:Re:an O(n^2) way Posted by:griffon at 2005-10-15 01:11:21 
> But n <= 100000, n^2 <= 10^10, it's to slow!
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