题解 | HJ94#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 scanner = new Scanner(System.in);
        ArrayList<String> list = new ArrayList<>();
        Map<String, Integer> map = new HashMap<>();
        //候选人数量
        int m = scanner.nextInt();
        for (int i = 0; i < m; i++) {
            String next = scanner.next();
            //初识票数为0
            map.put(next, 0);
            list.add(next);
        }
//        投票数
        int n = scanner.nextInt();
        for (int i = 0; i < n; i++) {
            String nextTicket = scanner.next();
            map.put(nextTicket, map.getOrDefault(nextTicket, 0) + 1);
        }
        //按格式输出
        Set<Map.Entry<String, Integer>> entrySet = map.entrySet();
//        有用票数
        int usefulTick = 0;
        for (String s : list) {
            for (Map.Entry<String, Integer> entry : entrySet) {
                if (entry.getKey().equals(s)) {
                    System.out.print(entry.getKey() + " " + ":" + " " + entry.getValue());
                    usefulTick += entry.getValue();
                }
            }

            System.out.println();
        }

        //无效票数= 总票数-有用票数
        int uselessTick = n - usefulTick;
        System.out.print("Invalid" + " " + ":" + " " + uselessTick);

    }
}