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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int a, b, c;
  6.     cin >> a >> b >> c;
  7.  
  8.  
  9.     if (b - a == c - b) {
  10.         cout << c + (b - a) << endl;
  11.     }
  12.  
  13.     else if (b % a == 0 && c % b == 0 && (b / a == c / b)) {
  14.         cout << c * (b / a) << endl;
  15.     }
  16.  
  17.     else {
  18.         cout << -1 << endl;
  19.     }
  20.  
  21.     return 0;
  22. }
Success #stdin #stdout 0.01s 5288KB
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stdin
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1 5 9
3 12 48
1 3 4
stdout
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13
https://ideone.com/Ozb8Fs
language:
C++14 (gcc 8.3)
created:
17 days ago
visibility:
public

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