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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> set1 = new HashSet<Integer>(){{add(1);add(3);add(5);add(7);}};
  28.     	Set<Integer> set2 = new HashSet<Integer>(){{add(2);add(3);add(6);add(7);}};
  29.     	Set<Integer> set3 = new HashSet<Integer>(){{add(4);add(5);add(6);add(7);}};
  30.  
  31.     	Set<Integer> setu = unique(set1, set2, set3);
  32.  
  33.         System.out.println("Input:");
  34.         System.out.println(set1);
  35.         System.out.println(set2);
  36.         System.out.println(set3);
  37.         System.out.println("Output:");
  38.         System.out.println(setu);
  39. 	}
  40. }
Success #stdin #stdout 0.03s 245632KB
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stdin
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Standard input is empty
stdout
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Input:
[1, 3, 5, 7]
[2, 3, 6, 7]
[4, 5, 6, 7]
Output:
[1, 2, 4]
https://ideone.com/reGDBy
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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