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Programming AI Assistant

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Can you review this Python function for efficiency? It calculates Fibonacci numbers recursively: ```python def fibonacci(n): if n <= 1: return n else: return fibonacci(n-1) + fibonacci(n-2) ```

I've analyzed your code and found some optimization opportunities!

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Code analysis complete

Your recursive Fibonacci implementation works correctly but has exponential time complexity O(2^n). I recommend using memoization or an iterative approach to achieve O(n) complexity. Here's an improved version...

|Your recursive Fibonacci implementation works correctly but has exponential time complexity O(2^n). I recommend using memoization or an iterative approach to achieve O(n) complexity. Here's an improved version...

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