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  1.  
  2.  
  3. #include <bits/stdc++.h>
  4. using namespace std;
  5. long long a[10];
  6.  
  7. long long tcs(string s)
  8. {
  9.     long long t = 0;
  10.  
  11.     for (char i : s)
  12.     {
  13.         t += i - '0';
  14.     }
  15.     return t;
  16. }
  17. int main() {
  18.     string s;
  19.     cin >> s;
  20.     if (tcs(s) % 9 != 0)
  21.     {
  22.         cout << -1;
  23.         return 0;
  24.     }
  25.  
  26.     sort(s.begin(), s.end());
  27.     long long i = 0;
  28.  
  29.     while (s[i] == '0')
  30.     {
  31.         i++;
  32.     }
  33.     string x = "";
  34.     x += s[i+1];
  35.  
  36.     for (int j = 0; j <= i; j++)
  37.     {
  38.         x += '0';
  39.     }
  40.     i++;
  41.  
  42.     while (i < s.size())
  43.     {
  44.         x += s[i];
  45.         i++;
  46.     }
  47.     cout << x;
  48.     a[x[x.size() - 1] - '0'] = (int)(x.size());
  49.     for (long long i = x.size() - 2; i >= 0; i--)
  50.     {
  51.         long long j = -1;
  52.  
  53.         for (long long v = 9; v >= 0; v--) if (a[v] != 0)
  54.         {
  55.             if (((x[i] - '0') * 10 + v) % 4 == 0 || ((v * 10) + (x[i] - '0')) % 4 == 0)
  56.             {
  57.                 j = a[v] - 1;
  58.                 for (long long k = 0; k < i; k++) cout << x[k];
  59.                 for (long long k = i + 1; k <= j - 1; k++) cout << x[k];
  60.                 for (long long k = j + 1; k <= x.size() - 1; k++) cout << x[k];
  61.                 long long _min = min(x[i], x[j]) - '0';
  62.             	long long _max = max(x[i], x[j]) - '0';
  63.                 if ((_min * 10 + _max) % 4 == 0) cout << _min << _max;
  64.                 else cout << _max << _min;
  65.                 return 0;
  66.             }
  67.         }
  68.         if (a[x[i] - '0'] == 0) a[x[i] - '0'] = i + 1;
  69.     }
  70. }
  71.  
Success #stdin #stdout 0.01s 5312KB
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https://ideone.com/AJ7Tfi
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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