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求 number of (i, j) s.t. i+j<=d and n|i-j

Posted by mathzqy at 2004-11-29 22:07:04 on Problem 2129
In Reply To:这题的做法是怎样呢？很怪异的题目 Posted by:zsuyrl at 2004-11-29 00:12:14 



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