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用母函数

Posted by ailing at 2012-05-09 09:42:35 on Problem 1664
其实这个题用母函数思路也是很简单的,母函数:G(x)=(1+x+x2+..xm)(1+x2+x4+..xm)(1+x3+x6+..xm)....(1+xn+x2n+..xm)

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