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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.     int n(0);
  8.     cin >> n;
  9.     unsigned long long arr[n];
  10.     arr[0] = 2;
  11.     arr[1] = 4;
  12.     arr[2] = 7;
  13.     for(int i = 3;i<n;++i)arr[i] = arr[i-1] + arr[i-2] + arr[i-3];
  14.     cout << arr[n-1];
  15.  
  16.     cout << endl;
  17.     return 0;
  18. }
  19.  
Success #stdin #stdout 0s 4572KB
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https://ideone.com/llEXmK
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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