fork download
copy 
  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, 7, 5, 9, 2, 12, 3};
  14.         int k = 2;
  15. 		System.out.println(countPairsWithAbsoluteDiffK(arr,k));
  16.  
  17. 	}
  18.  
  19. 	static int countPairsWithAbsoluteDiffK(int[] arr, int k){
  20. 		HashMap<Integer,Integer> map = new HashMap<>();
  21. 		int cnt = 0;
  22. 		for(int i=0;i<arr.length;i++){
  23. 			int req1 = arr[i]+k;
  24. 			int req2 = arr[i]-k;
  25. 			if(map.containsKey(req1)){
  26. 				cnt+=map.get(req1);
  27. 			}
  28. 			if(k!=0 && map.containsKey(req2)){
  29. 				cnt+=map.get(req2);
  30. 			}
  31. 			map.put(arr[i],map.getOrDefault(arr[i],0)+1);
  32. 		}
  33.  
  34. 		return cnt;
  35. 	}
  36. }
Success #stdin #stdout 0.09s 52528KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
4
https://ideone.com/4n427d
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!