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一开始想的方向就错了……居然往二分上想,想了好久都想不出

Posted by xijunlee93 at 2013-04-12 22:17:34 on Problem 1840
思路:对方程做个处理,将O(n^5)->O(n^2+n^3),其实也就是O(n^3),计算量降到百万次,然后用short存储hash即可…… 

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