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  1. /*
  2. Submitted With (^^) by -> Hossam ^_^
  3.  _____________________
  4. |     ___     ___     |
  5. |    (^_^)   (^_^)    |
  6. |   /( | )\_/( | )\   |
  7. |_____|_|_____|_|_____|
  8. */
  9.  
  10. #include <bits/stdc++.h>
  11.  
  12. using namespace std;
  13.  
  14. inline void prep()
  15. {
  16.     cin.tie(0);
  17.     cin.sync_with_stdio(0);
  18. }
  19.  
  20. #define X first
  21. #define Y second
  22. #define ll long long
  23. #define inf (0x7fffffffffffffff)
  24. #define all(x) x.begin(), x.end()
  25. #define ZXC cerr << clock() * 1.0 / CLOCKS_PER_SEC << endl;
  26.  
  27. const int mod = (int)1e9 + 7;
  28. const int MX = (int)1e6 + 5;
  29.  
  30. int main()
  31. {
  32.     prep();
  33.  
  34.     int tc;
  35.     cin >> tc;
  36.     int T = tc;
  37.  
  38.     while (tc--)
  39.     {
  40.  
  41.         int n, l;
  42.         cin >> n >> l;
  43.  
  44.         vector<string> s(n);
  45.         bool ch[30][30][30];
  46.         bool mask[30][30];
  47.         memset(ch, 0, sizeof ch);
  48.         memset(mask, 0, sizeof mask);
  49.  
  50.         for (int i = 0; i < n; ++i)
  51.         {
  52.             cin >> s[i];
  53.             for (int idx = 0; idx < l; ++idx)
  54.             {
  55.                 if (idx + 1 < l)
  56.                     ch[s[i][idx] - 'A'][idx][(s[i][idx + 1] - 'A')] = 1;
  57.                 mask[idx][s[i][idx] - 'A'] = 1;
  58.             }
  59.         }
  60.  
  61.         string res = s[rand() % n];
  62.         bool found = false;
  63.         for (int c = 0; c < 26; ++c)
  64.         {
  65.             for (int idx = 0; idx + 1 < l; ++idx)
  66.             {
  67.                 for (int i = 0; i < 26; ++i)
  68.                 {
  69.                     if (mask[idx][c] && ch[c][idx][i] ^ mask[idx + 1][i])
  70.                     {
  71.                         found = true;
  72.                         res[idx] = 'A' + c;
  73.                         res[idx + 1] = 'A' + i;
  74.                         break;
  75.                     }
  76.                 }
  77.                 if (found)
  78.                     break;
  79.             }
  80.             if (found)
  81.                 break;
  82.         }
  83.  
  84.         cout << "Case #" << T - tc << ": " << (found ? res : "-") << "\n";
  85.     }
  86.  
  87.     // ZXC
  88.     return 0;
  89. }
  90.  
Success #stdin #stdout 0s 4180KB
comments (?)
stdin
copy 
1
8 4
AAAA
ABAA
BAAA
BBAA
AABA
ABBA
AABB
AAAB
stdout
copy 
Case #1: -
https://ideone.com/hHGK2K
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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