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class Solution {
    public long subarrayXor(int arr[], int k) {
        int n =arr.length;
 
        HashMap<Integer,Integer>f = new HashMap<>();
 
        int[] prefixxor = new int[n];
 
        prefixxor[0]=arr[0];
        for(int i=1;i<n;i++){
            prefixxor[i]=prefixxor[i-1]^arr[i];
        }
 
        f.put(0,1);
        long count=0;
 
        for(int i=0;i<n;i++){
            if(f.containsKey(prefixxor[i]^k)){
                count+=f.getOrDefault(prefixxor[i]^k,0);
            }
            f.put(prefixxor[i],f.getOrDefault(prefixxor[i],0)+1);
        }
 
        return count;
    }
}

Main.java:5: error: cannot find symbol
        HashMap<Integer,Integer>f = new HashMap<>();
        ^
  symbol:   class HashMap
  location: class Solution
Main.java:5: error: cannot find symbol
        HashMap<Integer,Integer>f = new HashMap<>();
                                        ^
  symbol:   class HashMap
  location: class Solution
2 errors

Standard output is empty