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  1. class Solution {
  2.     public int countKDifference(int[] nums, int k) {
  3.         int n=nums.length;
  4.         HashMap<Integer,Integer>f = new HashMap<>();
  5.         int count=0;
  6.  
  7.         f.put(nums[0],1);
  8.         for(int j=1;j<n;j++){
  9.             if(f.containsKey(nums[j]-k)){
  10.                 count+=f.get(nums[j]-k);
  11.             }
  12.             if(f.containsKey(nums[j]+k)){
  13.                 count+=f.get(nums[j]+k);
  14.             }
  15.  
  16.             f.put(nums[j],f.getOrDefault(nums[j],0)+1);
  17.         }
  18.         return count;
  19.  
  20.     }
  21. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:4: error: cannot find symbol
        HashMap<Integer,Integer>f = new HashMap<>();
        ^
  symbol:   class HashMap
  location: class Solution
Main.java:4: error: cannot find symbol
        HashMap<Integer,Integer>f = new HashMap<>();
                                        ^
  symbol:   class HashMap
  location: class Solution
2 errors
stdout
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Standard output is empty
https://ideone.com/4WbYvl
language:
Java (HotSpot 12)
created:
9 days ago
visibility:
public

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