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  1. #include <iostream>
  2. using namespace std;
  3. long long a[100],n;
  4. int main() {
  5. 	cin >> n;
  6. 	a[1]=2;
  7. 	a[2]=3;
  8. 	for(int i=3;i<=100;i++){
  9. 		a[i]=a[i-1]+a[i-2];
  10. 	}
  11. 	int i=1;
  12. 	while(a[i+1]<=n) i++;
  13. 	cout<<i;
  14. 	return 0;
  15. }
Success #stdin #stdout 0s 3464KB
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https://ideone.com/dAVYYe
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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