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Solution: Fibonacci Number

Explore how to compute Fibonacci numbers using a mathematical approach based on Binet's formula and the golden ratio. Learn to implement a fast algorithm with logarithmic time complexity and constant space that avoids recursion and iteration, enhancing your problem-solving skills in coding interviews.

Statement

The Fibonacci sequence is a famous series of numbers in which each value is created by adding the two preceding numbers. The sequence begins with:

  • F(0)=0F(0) = 0

  • F(1)=1F(1) = 1

From that point on, every term is defined as:

  • F(n)=F(n1)+F(n2)F(n) = F(n - 1) + F(n - 2), for any nn greater than 11

Your task is to compute the value of F(n)F(n) for a given integer n.

Constraints:

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