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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. 		Scanner sc = new Scanner(System.in);
  13.     int n = sc.nextInt();
  14.     int arr []=  new int[n];
  15.  
  16.     for(int i=0;i<n;i++){
  17.         arr[i] = sc.nextInt();
  18.     }
  19.     int k = sc.nextInt();
  20.     int ans =0;
  21.     HashMap<Integer,Integer> map = new HashMap<>();
  22.  
  23.     map.put(arr[0],1);
  24.  
  25.     for(int i=1;i<n;i++){
  26.         int temp = arr[i] + k;
  27.         if(map.containsKey(temp)){
  28.             ans += map.get(temp);
  29.         }
  30.         map.put(arr[i],map.getOrDefault(arr[i],0)+1);
  31.     }
  32.  
  33.     System.out.println(ans);
  34. 	}
  35. }
Success #stdin #stdout 0.12s 56532KB
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https://ideone.com/nLaBdW
language:
Java (HotSpot 12)
created:
15 hours ago
visibility:
public

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