题解 | #字符串字符匹配#

using System;
using System.Collections.Generic;

namespace HJ81
{
    internal class Program
    {
        static void Main(string[] args)
        {
            string shortStr=Console.ReadLine();
            string longStr=Console.ReadLine();
            if (shortStr.Length > longStr.Length)
            {
                Console.WriteLine("false");
                return;
            }

            HashSet<char> chars = new HashSet<char>();
            foreach (char c in longStr)
            {
                chars.Add(c);
            }

            foreach (char c in shortStr)
            {
                if (!chars.Contains(c))
                {
                    Console.WriteLine("false");
                    return;
                }
            }

            Console.WriteLine("true");
        }
    }
}