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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[] = {1,3,4,2,4,1,1,3};
  14. 		int k = 2;
  15. 		int n = arr.length;
  16. 		int count=0;
  17.  
  18. 		HashMap<Integer,Integer> map = new HashMap<>();
  19. 		for(int i = 0;i<n;i++){
  20.  
  21. 			if(map.containsKey(Math.abs(arr[i]+k))){
  22. 				count += map.get(arr[i] + k);
  23. 			}
  24.  
  25. 			if(map.containsKey(Math.abs(arr[i]-k))){
  26. 				count += map.get(Math.abs(arr[i]-k));
  27. 			}
  28.  
  29. 			            map.put(arr[i], map.getOrDefault(arr[i], 0) + 1);
  30.  
  31. 		}
  32. 		System.out.println(count);
  33. 	}
  34. }
Success #stdin #stdout 0.1s 54548KB
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11
https://ideone.com/c3FGa9
language:
Java (HotSpot 12)
created:
6 days ago
visibility:
public

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