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Go to Fibonacci Number folder, you will see two files there, fibonacci number.py asks you to implement a function that returns the nth Fibonacci Number

Go to Fibonacci Number folder, you will see two files there, fibonacci number.py asks you to implement a function that returns the nth Fibonacci Number given n. A naive recursive implementation is given to you but it runs very slow when n gets large, you need to implement a better one ( an iterative ( loop ) one) to improve the efficiency.

# python3 def fibonacci_number_naive(n): assert 0 <= n <= 45 if n <= 1: return n return fibonacci_number_naive(n - 1) + fibonacci_number_naive(n - 2) def fibonacci_number(n): assert 0 <= n <= 45 # START CODE HERE # END CODE HERE if __name__ == '__main__': input_n = int(input()) print(fibonacci_number(input_n)) 

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