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21. 斐波那契数列
https://www.acwing.com/problem/content/submission/code_detail/2610805/
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AcWing/21/21.cpp
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AcWing/21/21.cpp
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class Solution {
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public:
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int Fibonacci(int n) {
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if (n == 0) return 0;
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if (n == 1) return 1;
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if (n == 2) return 1;
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return Fibonacci(n - 1) + Fibonacci(n - 2);
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}
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};
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