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Can you help me write a Python function to calculate Fibonacci numbers efficiently?
Here's an efficient Python function using memoization:
def fibonacci(n, memo={}):
if n in memo: return memo[n]
if n <= 1: return n
memo[n] = fibonacci(n-1) + fibonacci(n-2)
return memo[n]
# Usage: print(fibonacci(100))This uses memoization for O(n) time complexity instead of exponential.
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