Problem Statement
Find nth Fibonacci number.
Approach
F(n) = F(n-1) + F(n-2). Use memoization or iteration.
Time & Space Complexity
Time O(n), Space O(1) iterative.

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Classic recursion problem with DP optimization.
Find nth Fibonacci number.
F(n) = F(n-1) + F(n-2). Use memoization or iteration.
Time O(n), Space O(1) iterative.
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