矩阵快速幂！
$$$\begin{pmatrix}f[i]\f[i-1]\end{pmatrix}\begin{pmatrix}0\ 1\1\ 1\end{pmatrix}$$$
A fast algorithm for calculating fibonacci
矩阵快速幂！
$$$\begin{pmatrix}f[i]\f[i-1]\end{pmatrix}\begin{pmatrix}0\ 1\1\ 1\end{pmatrix}$$$
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