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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. using namespace std;
  4. int s[5];
  5. int xuly(int n)
  6. {
  7.     if(n > 18)
  8.         return -1;
  9.     if(n >= 10)
  10.         return (n - 9) * 10 + 9;
  11.     else
  12.         return n;
  13. }
  14. int main()
  15. {
  16.     int n;
  17.     cin >> n;
  18.     int cnt = 4;
  19.     while(n)
  20.     {
  21.         s[cnt--] = n % 10;
  22.         n/=10;
  23.     }
  24.     int s1 = xuly(s[1] * 10 + s[2]);
  25.     int s2 = xuly(s[3] * 10 + s[4]);
  26.     if(s1 == -1 || s2 == -1)
  27.     {
  28.         cout << 0;
  29.         return 0;
  30.     }
  31.     if(s1 > s2) swap(s1, s2);
  32.     if(s1 < 10)
  33.     {
  34.         if(s1 == 0)
  35.         {
  36.             cout << s2 << "00";
  37.             return 0;
  38.         }
  39.         if(s1 + 9 < s2)
  40.             cout << s1 + 9 << s2;
  41.         else
  42.             cout << s2 << 0 << s1;
  43.     }
  44.     else
  45.         cout << s1 << s2;
  46. }
  47.  
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/SO5dSh
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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