題解 | #斐波那契數(shù)列#
斐波那契數(shù)列
http://fangfengwang8.cn/practice/aa8ffe28ec7c4050b2aa8bc9d26710e9
寫這個之前先了解斐波那鍥數(shù)列就知道：第一個數(shù)是0；第二個和第三個數(shù)是1；長度在2以上的可以用f(n-1) + f(n-2)去運算
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