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Fibonacci

Topic description:

As we all know, the Fibonacci series is now required to enter a positive integer n. Please output the nth term of the Fibonacci series.

Ideas for solving the problem:

1. Recursion

two。 Dynamic programming

Status: F (n)

State recursion: F (n) = F (nmur1) + F (nmur2)

Initial value: F (1) = F (2) = 1

Returned result: F (N)

Code implementation:

Method 1: recursion (low efficiency):

Class Solution {public: int Fibonacci (int n) {/ / initial value if (n

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