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  1. #include <iostream>
  2. using namespace std;
  3. int fib_n(int n);
  4. int main() {
  5. 	cout<<"input N"<<endl;
  6. 	int n;
  7.    	cin>>n;
  8.    	cout<<"F:\t"<<fib_n(n)<<endl;
  9. 	return 0;
  10. }
  11.  
  12. int fib_n(int n)
  13. {
  14. 	if (n <= 2) return 1;
  15.  
  16. 	int x = 1;
  17. 	int y = 1;
  18. 	int ans = 0;
  19. 	for (int i = 2; i < n; i++)
  20. 	{
  21. 		ans = x + y;
  22. 		x = y;
  23. 		y = ans;
  24. 	}
  25. 	return ans;
  26. }
Success #stdin #stdout 0s 3144KB
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stdout
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input N
F:	1
https://ideone.com/v2BVLV
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
secret

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