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class Solution {
    public int[] findThePrefixCommonArray(int[] A, int[] B) {
        int n = A.length;
        HashMap<Integer,Integer>f =new HashMap<>();
 
        int[] C=new int[n];
        int count=0;
 
        for(int i=0;i<n;i++){
            if(A[i]==B[i]){
             count++;
            }
            else{
               if(f.containsKey(A[i])){
                count+=f.getOrDefault(A[i],0);
               }
               if(f.containsKey(B[i])){
                count+=f.getOrDefault(B[i],0);
 
               }
            }
            C[i]=count;
            f.put(A[i],f.getOrDefault(A[i],0)+1);
            f.put(B[i],f.getOrDefault(B[i],0)+1);
 
        }
        return C;
    }
}

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

Standard output is empty