Given a positive integer N, your task is to print the Nth non Fibonacci number. The Fibonacci numbers are defined as:
Fib(0) = 0
Fib(1) = 1
for n >1, Fib(n) = Fib(n-1) + Fib(n-2)
Example 1:
Input: N = 5
Output: 10
Explaination: The first 5 non-fibonacci
numbers are 4, 6, 7, 9, 10.
Example 2:
Input: N = 15
Output: 22
Explaination: The fibonacci numbers
are 1, 2, 3, 5, 8, 13, 21, 34. Here
22 becomes the 15th non-fibonacci
number.
Your Task:
You do not need to read input or print anything. Your task is to complete the function nonFibonacci() which takes the value N and returns the Nth non-fibonacci number.
Expected Time Complexity: O(N) Expected Auxiliary Space: O(1)
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Avoid using static/global variables in coding problems as your code is tested
against multiple test cases and these tend to retain their previous values.
Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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