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设 a=n/2,b=n-a; 结果是a*(a-1)/2+b*(b-1)/2;

Posted by Grope at 2003-11-01 21:41:47 on Problem 1455
In Reply To:这样有点慢,这题直接有公式,[n/2]*[(n-1)/2] Posted by:dynamic at 2003-11-01 21:35:48


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