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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 temp1 = arr[i] + k;
  27.         int temp2 = arr[i] - k;
  28.  
  29.         if(map.containsKey(temp1)){
  30.             ans = ans + map.get(temp1);
  31.         }
  32.  
  33.         if(map.containsKey(temp2)){
  34.             ans = ans + map.get(temp2);
  35.         }
  36.  
  37.         map.put(arr[i],map.getOrDefault(arr[i],0)+1);
  38.     }
  39.  
  40.  
  41.     System.out.println(ans);
  42. 	}
  43. }
Success #stdin #stdout 0.14s 54420KB
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https://ideone.com/9nwjzn
language:
Java (HotSpot 12)
created:
15 hours ago
visibility:
public

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