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Re:公式。。

Posted by GoToSea at 2008-04-30 17:13:14 on Problem 2411
In Reply To:公式。。 Posted by:wpolly at 2007-05-27 18:27:03 
> f(m,n)=sqrt(2^(mn)|R(U_m(x),U_n(ix))|)
> 
> 其中U_m是第二类Chebyshev多项式, R表示结式。。
不懂，还是写DP比较容易
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