题解 | #字符串排序#

首先使用set将key去重存入 然后在后面补齐缺失的字母 使用dictionary将set作为key值，对应之前的正常字母表 然后把wrod直接可以字典中查询到对应的字母

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleAppTest
{
    public static class Test
    {
        public static void Main()
        {
            string key = Console.ReadLine();
            string word = Console.ReadLine();
            char[] charKey = key.ToCharArray();
            char[] charWord = word.ToCharArray();

            HashSet<char> set = new HashSet<char>();
            for (int i = 0; i < charKey.Length; i++)
            {
                set.Add(charKey[i]);
            }
            int k = 0;
            while (set.Count < 26)
            {
                char temp = (char)('a' + k);
                set.Add(temp);
                k++;
            }
            List<char> list = set.ToList();
            Dictionary<char,char> map = new Dictionary<char,char>();
            int begin = 97;
            for (int i = 0; i < set.Count; i++)
            {
                map.Add((char)(begin + i), list[i]);
            }

            for (int i = 0; i < charWord.Length; i++)
            {
                    char temp = char.ToLower(charWord[i]);
            }
            Console.WriteLine(charWord);

        }
    }
}