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Re:怎么做？

Posted by akme at 2007-06-03 21:43:41 on Problem 3233
In Reply To:怎么做？ Posted by:lyb20042149 at 2007-06-03 18:03:08 
设f[n]=A^1+A^2+....A^n;
当n是偶数,f[n]=f[n/2]+f[n/2]*A^(n/2);
但n是奇数,f[n]=f[n-1]+A^(n);
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