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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. 		Scanner sc=new Scanner(System.in);
  14. 		int n=sc.nextInt();
  15. 		int a[]=new int[n];
  16. 		int k=sc.nextInt();
  17. 		for(int i=0;i<n;i++)
  18. 		a[i]=sc.nextInt();
  19. 		int count=0;
  20. 		Map<Integer,Integer> m=new HashMap<>();
  21. 		for(int i=0;i<n;i++)
  22. 		{
  23. 			int cpl=k+a[i];
  24. 			if(m.containsKey(cpl))
  25. 			count+=m.get(cpl);
  26. 			m.put(a[i],m.getOrDefault(a[i],0)+1);
  27.  
  28. 		}
  29. 		System.out.println(count);
  30.  
  31. 	}
  32. }
Success #stdin #stdout 0.12s 54632KB
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https://ideone.com/jeW6F8
language:
Java (HotSpot 12)
created:
12 hours ago
visibility:
public

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