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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int fibonacci(int k)
  5. {
  6.     if (k == 1 || k == 2)
  7.         return k;
  8.  
  9.     return (fibonacci(k-1) + fibonacci(k-2));
  10. }
  11.  
  12. int evenfibonacci()
  13. {
  14.     int result = 0;
  15.     for (int k = 1; fibonacci(k) <= 4e6; ++k) {
  16.         if (fibonacci(k) % 2 == 0) {
  17.             result += fibonacci(k);
  18.         }
  19.     }
  20.     return result;
  21. }
  22.  
  23. int main()
  24. {
  25. 	cout << evenfibonacci();
  26. }
Success #stdin #stdout 0.05s 5404KB
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https://ideone.com/I2kdgE
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
secret

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