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// Iterative Fibonacci
func fibonacciIterative(n int) int {
    current, prev := 0, 1
    for i := 0; i < n; i++ {
        current, prev = current + prev, current
    }
    return current
}

// Recursive Fibonacci
func fibonacciRecursive(n int) int {
    if n < 2 {
        return n
    } 
    return fibonacciRecursive(n - 1) + fibonacciRecursive(n - 2)
}