题解 | #删除字符串中出现次数最少的字符#

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

namespace Test1
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = string.Empty;
            while (!string.IsNullOrEmpty(input = Console.ReadLine()))
            {
                Dictionary<char, int> dic = new Dictionary<char, int>();               
                foreach (var item in input)
                {
                    if (dic.ContainsKey(item))
                    {
                        dic[item]++;
                    }
                    else
                    {
                        dic[item] = 1;
                    }
                }
                var temp = dic.OrderBy(p => p.Value).ToDictionary(p => p.Key, p => p.Value);
                int min = temp.First().Value;
                foreach (var ch in temp)
                {
                    if (ch.Value == min)
                    {
                        while (input.Contains(ch.Key))
                        {
                            input=input.Remove(input.IndexOf(ch.Key), 1);
                        }
                    }
                }
                Console.WriteLine(input);
            }
        }
    }
}