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Re:直接套公式就过了......

Posted by angeldust at 2012-03-04 10:57:41 on Problem 2663 and last updated at 2012-03-04 10:59:32
In Reply To:Re:直接套公式就过了...... Posted by:huicpc39 at 2010-03-01 12:16:06

> if(n&1)printf("0\n");
> else printf("%d\n",(int)(0.7886751345948128822545743*pow(3.7320508075688772935274463415,n/2.)+1));
强，看到这个才想起，确实可以用二阶特征方程算通项的···
全部都还给老师了···

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