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在每一列里，解一元二次方程求排名；在每一列的排名相加得总排名。因此，二分答案的每一步是O(N)的。In Reply To:Re:诚心请教这题思路,我只想到利用同列行单调性质二分答案,因为由偏导知在列顺序上不严格单调,但本地跑50000,....这样极限好慢,这题想了一天,先多谢了..... Posted by:DreamOfGame at 2008-08-31 23:42:03 Followed by: Post your reply here: |
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