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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int a, b, c, d;
  6.     cin >> a >> b >> c >> d;
  7.     if (b % a != c % b != d % c || (b / a != c / b) ||
  8.         (c / b != d / c)) {
  9.         cout << "NU";
  10.     } else {
  11.         cout << "DA";
  12.     }
  13.     return 0;
  14. }
Success #stdin #stdout 0.01s 5284KB
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3 9 27 81
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DA
https://ideone.com/xvcP3V
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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