Problem Statement  
Given a group of dancers' heights, arrange a circle formation that minimizes the maximum height difference between each pair of neighboring dancers. Write a class CircleDance with a method arrangeDancers that takes a int[], heights, and returns the maximum height difference between neighboring dancers.  
Definition  
 
Constraints  
  heights will contain between 3 and 20 elements inclusive.  
  Each element of heights will be between 150 and 210 inclusive.  
Examples  
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