Leetcode 509. Fibonacci Number
Compute F(n) defined by F(0)=0, F(1)=1 and F(n)=F(n-1)+F(n-2); return the nth Fibonacci number for 0 ≤ n ≤ 30. The task tests handling a simple linear recurrence efficiently (iterative or memoized DP rather than naive exponential recursion).
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