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神奇的斐波拉契数列
斐波拉契数列是一个非常神奇的数列，它的定义如下： F0 = 0, F1 = 1, Fn = Fn-1 + Fn-2 (n >= 2) 我们可以写出它的前几项： 0, 1, 1, 2, 3, 5, 8, 13…
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