Missing {}

I hope you understand difference between this:
  
else
      cout << "There are two adjacent elements where "
           << "the second is twice the first."
           << "\n They have values of " << *(result2++);
      cout << " & " << *result2 << "." << endl;

... and this:
else
   {
      cout << "There are two adjacent elements where "
           << "the second is twice the first."
           << "\n They have values of " << *(result2++);
      cout << " & " << *result2 << "." << endl;
   }

Author: EmilEnchev

docs/standard-library/algorithm-functions.md

@@ -124,10 +124,12 @@ int main()
       cout << "There are not two adjacent elements where the "
            << " second is twice the first." << endl;
    else
+   {
       cout << "There are two adjacent elements where "
            << "the second is twice the first."
            << "\n They have values of " << *(result2++);
       cout << " & " << *result2 << "." << endl;
+   }
 }
 ```