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  1.  
  2. #include <bits/stdc++.h>
  3. using namespace std;
  4. int t, b, c, k;
  5. int x(int a)
  6. {
  7.     int r = 10;
  8.     while (a >= r)
  9.         r*= 10;
  10.     return r;
  11. }
  12. string a(int b, int c, int k)
  13. {
  14.     string s = "";
  15.     int nho = 0, r, d = x(c);
  16.     while (s.size() <= 1000)
  17.     {
  18.         r = c % 10 * k + nho % 10;
  19.         s = to_string(r%10) + s;
  20.         c = ((r%10) * d + c) / 10;
  21.         nho = nho/10 + r/10;
  22.         if (c*k + nho == b) return s;
  23.     }
  24.     return "-1";
  25. }
  26. int main()
  27. {
  28.     cin>>t;
  29.  
  30.     while (t--)
  31.     {
  32.         cin>>b>>c>>k;
  33.         cout<<a(b, c, k)<<'\n';
  34.     }
  35. }
Success #stdin #stdout 0s 5312KB
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https://ideone.com/uvGdRE
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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