题解 | #记票统计#

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            int n = Integer.parseInt(in.nextLine());
            String str1 = in.nextLine();
            String[] str1s = str1.split(" ");
            int m = Integer.parseInt(in.nextLine());
            String str2 = in.nextLine();
            String[] str2s = str2.split(" ");
            Map<String, Integer> map = new LinkedHashMap<>();
            for(int i = 0;i<n;i++){
                map.put(str1s[i],0);
            }
            int invalid = 0;
            for (int i = 0; i < m; i++) {
                String key = str2s[i];
                if (map.containsKey(key)) {
                    map.put(key, map.get(key) + 1);
                } else {
                    invalid++;
                }
            }
            map.put("Invalid",invalid);
            for (Map.Entry<String, Integer> entry : map.entrySet()) {
                System.out.println(entry.getKey() + " : " + entry.getValue());
            }
        }
    }
}