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public class ReadingBooks { public int countBooks(string[] parts) { int res = 0; int idx = 0; while (idx + 2 < parts.Length) { int delta = 1; if (parts[idx] != parts[idx + 1] && parts[idx + 1] != parts[idx + 2] && parts[idx] != parts[idx + 2]) { res++; delta = 3; } idx += delta; } return res; } }

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public class ReadingBooks
{
 public int countBooks(string[] parts)
 {
  int res = 0;
  int idx = 0;
  while (idx + 2 < parts.Length)
  {
   int delta = 1;
   if (parts[idx] != parts[idx + 1] && parts[idx + 1] != parts[idx + 2] && parts[idx] != parts[idx + 2])
   {
    res++;
    delta = 3;
   }
   idx += delta;
  }
  return res;
 }
}

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