https://www.acmicpc.net/problem/10816

숫자 카드 2.java

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] num = new int[20000001];
        int n = sc.nextInt();
        for(int i=0; i<n; i++) num[sc.nextInt()+10000000]++;
        int m = sc.nextInt();
        for(int i=0; i<m; i++) System.out.print(num[sc.nextInt()+10000000]+" ");
    }
}