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  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>
  4. #include <string>
  5.  
  6. using namespace std;
  7.  
  8. int arr[27];
  9.  
  10. int main()
  11. {
  12.     int A = 0;
  13.     bool result = false;
  14.     string s;
  15.  
  16.     cin >> s;
  17.  
  18.     for (int i = 0; i < s.size(); i++)
  19.     {
  20.         if (s[i] >= 'A' && s[i] <= 'Z')
  21.         {
  22.             A = s[i];
  23.             A -= 65;
  24.             arr[A]++;
  25.         }
  26.         else if (s[i] >= 'a' && s[i] <= 'z')
  27.         {
  28.             A = s[i];
  29.             A -= 97;
  30.             arr[A]++;
  31.         }
  32.     }
  33.     int size = sizeof(arr) / sizeof(arr[0]);
  34.     int curmax = 27, bemax = 27;
  35.  
  36.     for (int i = 0; i < size;)
  37.     {
  38.         if (arr[curmax] <= arr[i])
  39.         {
  40.             bemax = curmax;
  41.             curmax = i;
  42.         }
  43.  
  44.         if (curmax != 27 && bemax != 27
  45.             && arr[curmax] == arr[bemax] && i > size-1)
  46.         {
  47.             cout << "?";
  48.             result = true;
  49.  
  50.             break;
  51.         }
  52.         i++;
  53.     }
  54.  
  55.     if (!result)
  56.     {
  57.         char B = curmax + 65;
  58.         cout << B;
  59.     }
  60.  
  61.  
  62.  
  63. }
  64.  
Success #stdin #stdout 0.01s 5276KB
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https://ideone.com/uJvT2s
language:
C++14 (gcc 8.3)
created:
10 days ago
visibility:
public

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