题解 | #记票统计#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

class Program
{
    static void Main(string[] args)
    {
        var user_sum = int.Parse(Console.ReadLine());
        var user_list = Console.ReadLine().Split(" ");
        var ticket_sum = int.Parse(Console.ReadLine());
        var ticket_list = Console.ReadLine().Split(" ");
        var res = new Dictionary<string, int>();
        var error_num = ticket_sum;
        foreach (var item in user_list)
        {
            res[item] = ticket_list.Where(a => a == item).Count();
        }
        foreach (var item in res)
        {
            Console.WriteLine($"{item.Key} : {item.Value}");
            error_num -= item.Value;
        }
        Console.WriteLine($"Invalid : {error_num}");
    }
}