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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios_base::sync_with_stdio(0);
  6.     cin.tie(0);
  7.  
  8.     int a, d, k;
  9.     cin >> a >> d >> k;
  10.     int n;
  11.  
  12.     n = (k - a) / d;
  13.     if (n < 0 || a + (d*(n-1)) != k) {
  14.         cout << "X";
  15.     }
  16.     else {
  17.         cout << n + 1 << endl;
  18.     }
  19. }
Success #stdin #stdout 0.01s 5288KB
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stdin
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1 1 1
stdout
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X
https://ideone.com/kbKFL8
language:
C++14 (gcc 8.3)
created:
12 days ago
visibility:
public

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