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solved by 2sozx

$f(1) = a, f(2) = b, f(i) = 2f(i - 2) + f(i - 1) + i^4$ 求 $f(n)$。$n,a,b < 2^{31}$

矩阵快速幂模板题，注意爆 $int$

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给一个圆柱体容器，底面半径为 $1$ ，高为 $2$ ，现向其中倒入高度为 $d$ 的水，将容器倾斜，问水刚好不洒出容器时液面的面积是多少。

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