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  1. import java.util.*;
  2. import java.lang.*;
  3.  
  4. class Main
  5. {
  6.  
  7.     public static <E> Set<E> unique(Set<? extends E>... sets){
  8.        Set<E> once = new HashSet<E>();
  9.        Set<E> twice = new HashSet<E>();
  10.  
  11.        for(Set<? extends E> set:sets){
  12.           for(E el:set){
  13.              if(once.contains(el)){
  14.                 twice.add(el);
  15.              } else {
  16.                 once.add(el);
  17.              }
  18.           }
  19.        }
  20.  
  21.        once.removeAll(twice);
  22.        return once;
  23.     } 
  24.  
  25.     public static void main (String[] args) throws java.lang.Exception
  26. 	{
  27.         Set<Integer> a = new HashSet<Integer>();
  28.                 a.add(2);
  29.                 a.add(4);
  30.                 a.add(6);
  31.         a.add(8);
  32.         a.add(9);
  33.  
  34.                 Set<Integer> b = new HashSet<Integer>();
  35.                 b.add(2);
  36.         a.add(8);
  37.                 b.add(9);
  38.  
  39.                 Set<Integer> c = new HashSet<Integer>();
  40.                 c.add(2);
  41.                 c.add(4);
  42.                 c.add(8);
  43.         a.add(9);
  44.  
  45.         Set<Integer> s= unique(a, b, c);
  46.  
  47.         for (int t : s) {
  48.                         System.out.print(t + ", ");
  49.                 }                    
  50. 	}
  51. }
Success #stdin #stdout 0.03s 245632KB
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6,
https://ideone.com/OXhVUL
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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