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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. long long n;
  6.  
  7. int main()
  8. {
  9.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  10.  
  11.     cin >> n;
  12.     long long x = 0, y = 1; // x = f[i - 2], y = f[i - 1]
  13.     for (int i = 2; i <= n; i++)
  14.     {
  15.         long long next_i = x + y;
  16.         x = y;
  17.         y = next_i;
  18.     }
  19.     cout << y;
  20. }
Success #stdin #stdout 0.01s 5280KB
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stdin 
Standard input is empty
stdout 
1
https://ideone.com/5JoZt1
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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