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  1. #include <bits/stdc++.h>
  2.  
  3. #define FOR(i, a, b) for(int i = a; i <= b; i++)
  4. #define ll long long
  5.  
  6. using namespace std;
  7.  
  8. ll p, delta, sigma, Pow[20];
  9.  
  10. void init()
  11. {
  12.     Pow[0] = 1;
  13.     FOR(i, 1, 18) Pow[i] = Pow[i - 1] * 10LL;
  14. }
  15.  
  16. void nhap()
  17. {
  18.     cin >> p >> delta >> sigma;
  19. }
  20.  
  21. void giai()
  22. {
  23.     string s = to_string(p);
  24.     int cursz = s.size();
  25.     ll curnum = p;
  26.  
  27.     if(sigma <= cursz)
  28.     {
  29.         FOR(i, 0, sigma - 1) cout << s[i];
  30.         return;
  31.     }
  32.  
  33.     sigma -= cursz;
  34.  
  35.     while(true)
  36.     {
  37.         ll nxt = Pow[cursz] - 1;
  38.         ll k = (nxt - curnum) / delta;
  39.  
  40.         if(cursz * k < sigma)
  41.         {
  42.             sigma -= cursz * k;
  43.             cursz++;
  44.             curnum += k * delta;
  45.         }
  46.         else
  47.         {
  48.             ll d = sigma / cursz;
  49.             ll cur = curnum + d * delta;
  50.  
  51.             if(sigma % cursz == 0)
  52.             {
  53.                 cout << cur;
  54.                 break;
  55.             }
  56.             else
  57.             {
  58.                 int len = sigma % cursz;
  59.                 cur += delta;
  60.                 string ans = to_string(cur);
  61.                 FOR(i, 0, len - 1) cout << ans[i];
  62.                 break;
  63.             }
  64.         }
  65.     }
  66. }
  67.  
  68. int main()
  69. {
  70.     ios_base::sync_with_stdio(0);
  71.     cin.tie(0); cout.tie(0);
  72.  
  73.     #define name "digits"
  74.  
  75.     if(fopen(name".inp", "r"))
  76.     {
  77.         freopen(name".inp", "r", stdin);
  78.         freopen(name".out", "w", stdout);
  79.     }
  80.  
  81.     nhap();
  82.     init();
  83.     giai();
  84.  
  85.     return 0;
  86. }
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/4UHcN1
language:
C++14 (clang 8.0)
created:
6 hours ago
visibility:
public

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