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Derga

Untitled

Aug 11th, 2020
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C++ 0.40 KB | None | 0 0
  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int Fib(int n) {
  6.     if (n == 0 || n == 1) {
  7.         return 1;
  8.     }
  9.  
  10.     int fib_prev = 1;
  11.     int fib_cur = 1;
  12.     int fib_next = fib_prev + fib_cur;
  13.  
  14.     for (int i = 2; i <= n; ++i) {
  15.         fib_next = fib_prev + fib_cur;
  16.         fib_prev = fib_cur;
  17.         fib_cur = fib_next;
  18.     }
  19.  
  20.     return fib_next;
  21. }
  22.  
  23. int main() {
  24.     int n;
  25.     cin >> n;
  26.  
  27.     cout << Fib(n) << endl;
  28.  
  29.     return 0;
  30. }
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