\[f[1] = 1,f[2] = 1,……\]
\[F_n = \frac{1}{\sqrt{5}} ((\frac{1 + \sqrt{5}}{2})^n - (\frac{1 - \sqrt{5}}{2})^n)\]
Fibonacci decomposition of Number of
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Origin www.cnblogs.com/AlphaWA/p/11372043.html
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