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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int n;
  6.     cin >> n;
  7.  
  8.     long long a = 1, b = 1;
  9.  
  10.     if (n == 0 || n == 1) {
  11.         cout << 1;
  12.         return 0;
  13.     }
  14.  
  15.     for (int i = 2; i <= n; i++) {
  16.         long long c = a + b;
  17.         a = b;
  18.         b = c;
  19.     }
  20.  
  21.     cout << b;
  22. }
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/dSaWAc
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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