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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13. 		int[] arr = new int[]{2,4,6,6,4,2,4};
  14. 		int n = arr.length;
  15.  
  16. 		System.out.println(helper(arr,n));
  17. 	}
  18. 	static int helper(int[] arr, int n){
  19.  
  20. 		HashMap<Integer,Integer> map = new HashMap<>();
  21. 		int cnt = 0;
  22. 		for(int i=0;i<n;i++){
  23. 			map.put(arr[i], map.getOrDefault(arr[i],0)+1);
  24. 		}
  25. 		for(Map.Entry<Integer,Integer> entry : map.entrySet()){
  26. 			int freq = entry.getValue();
  27. 			if(freq == 1){
  28. 				return -1;
  29. 			} else {
  30. 				cnt+= freq/3+(freq%3==0?0:1);
  31. 			}
  32. 		}
  33. 		return cnt;
  34.  
  35. 	}
  36. }
Success #stdin #stdout 0.08s 54568KB
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https://ideone.com/ZjB6Q0
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

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