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Re:这题可以二分 . :)

Posted by Savior at 2006-02-18 16:05:04 on Problem 1967
In Reply To:这题可以二分 . :) Posted by:cscjzz at 2005-10-02 08:35:58 
用二分应该是不对的，可惜数据太弱，可以过。
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