solved by 2sozx
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solved by 2sozx
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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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