Which of the following is the best possible time complexity to get Nth Fibonacci number with O(1) extra space
(A) Time complexity T(n) is T(n-1) + T(n-2) which is exponential
(B) O(n)
(C) O(Logn)
(D) O(n^2)
Answer: (C)
Explanation: The best possible time complexity is O(Logn). See Program for nth Fibonacci number
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