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二分二分再二分。

Posted by 2008022118 at 2010-02-04 00:30:31 on Problem 3233 and last updated at 2010-02-04 00:32:09 
二分1：segma(A^i)二分；
二分2：A^i
二分3：矩阵乘法；
另加递归实现。
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