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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int n;
  6.     cin >> n;
  7.  
  8.     long long a = 0, b = 1, c;
  9.  
  10.     if (n == 0) {
  11.         cout << 0;
  12.         return 0;
  13.     }
  14.     if (n == 1) {
  15.         cout << 1;
  16.         return 0;
  17.     }
  18.  
  19.     for (int i = 2; i <= n; i++) {
  20.         c = a + b;
  21.         a = b;
  22.         b = c;
  23.     }
  24.  
  25.     cout << b;
  26.     return 0;
  27. }
Success #stdin #stdout 0.01s 5324KB
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https://ideone.com/BEoe4I
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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