package onlineinterview;

import java.util.HashSet;

public class Solution {
    
    
    public static int computeLiuCun(int[] firstdayID, int[] anydayID) {
        int result = 0;
        HashSet<Integer> s1 = new HashSet<Integer>();
        for(int i=0;i<firstdayID.length;i++) {
            s1.add(firstdayID[i]);
        }
        for(int i=0;i<anydayID.length;i++) {
            if(s1.contains(anydayID[i])) {
                result++;
            }
        }
        return result;
        
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
    }
    
    

}