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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7.     static ArrayList<Integer> removeDup(ArrayList<Integer> a) {
  8. 		Collections.sort(a);	
  9.  
  10. 		int uniqueCnt = 0; 
  11. 		for (int i = 0; i < a.size(); ++i) {
  12. 			if ((i == 0 || a.get(i) != a.get(i-1)) && (i+1 == a.size() || a.get(i) != a.get(i+1))) {
  13. 				a.set(uniqueCnt++, a.get(i));
  14. 			}
  15. 		} 
  16. 		a.subList(uniqueCnt, a.size()).clear();
  17. 		return a;
  18.     }
  19.  
  20.     public static void main (String[] args) throws java.lang.Exception
  21.     {
  22.         ArrayList<Integer> values = new ArrayList<>(Arrays.asList(1,2,3,4,4,5,6,7,7,8,9,10,11,11,11,11,11,12,12,13,13,13,13));
  23.         System.out.println(removeDup(values));
  24.         ArrayList<Integer> values2 = new ArrayList<>(Arrays.asList(1,1,2,2,3,3));
  25.         System.out.println(removeDup(values2));
  26.         ArrayList<Integer> values3 = new ArrayList<>(Arrays.asList(1));
  27.         System.out.println(removeDup(values3));
  28.     }
  29. }
Success #stdin #stdout 0.05s 4386816KB
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[1, 2, 3, 5, 6, 8, 9, 10]
[]
[1]
https://ideone.com/HoHmYE
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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