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  1. #include <iostream>
  2. using namespace std;
  3.  
  4.  
  5.  
  6. int main() {
  7.  
  8. 	int n, a=1, b=1, c;
  9. 	cin >> n;
  10.  
  11. 	if (n==1 || n==2)
  12. 		cout << 1 << endl;
  13. 	else
  14. 	{
  15. 		for(int i=3; i<=n; i++)
  16. 		{
  17. 			c=a+b;
  18. 			a=b;
  19. 			b=c;
  20. 		}
  21. 		cout << c << endl;
  22. 	}
  23.  
  24.  
  25.  
  26. 	return 0;
  27. }
Success #stdin #stdout 0s 5316KB
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https://ideone.com/30J4w1
language:
C++ (gcc 8.3)
created:
12 hours ago
visibility:
public

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