vj1307 黑皮的正方å½&cent

Vj1307 黑皮的正方å½&cent

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//±ÉÈ˵ķ½·¨ //Ä£Äâ //¶ÔÓڱ߳¤ 1¡«n µÄÕý·½ÐθöÊý ·Ö±ðÊÇ n^2 , (n-1)^2 , . .. , 1 //¹«Ê½·¨ //s=n(n+1)(2n+1)/6
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