hihoCoder题二：A + B详解

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
namespace ConsoleApp3
{
    class Program1
    {
        static void Main(string[] args)
        {
            List<int> list = new List<int>();
            string s;
            while (true)
            {
                if (list.Count==0)
                {
                    Console.Write("第" + 1 + "组数据为：");
                }
                 s = Console.ReadLine();//存储输入
               //输入符合要求时
                if (Regex.IsMatch(s, "^([1][0][0]|[1-9][0-9]|[1-9]){1}(\\s+)([1][0][0]|[1-9][0-9]|[1-9]){1}$"))
                {
                    string[] s2 = s.Split(' ');
                    list.Add(Convert.ToInt32(s2[0]) + Convert.ToInt32(s2[1]));
                    Console.Write("第" + (list.Count+1) + "组数据为：");
                }
                else//输入不符合要求时
                {
                   
                    if (String.IsNullOrEmpty(s))//直接回车会输出之前每组数据答案
                    {
                        for (int i = 0; i < list.Count; i++)
                        {
                            Console.Write("第" + (i+1) + "组数据之和为：");
                            Console.WriteLine(list[i]);
                        }  
                         list = new List<int>();                                        
                    }
                    else//输入错误提示
                    {
                        Console.WriteLine("第" + (list.Count + 1) + "组数据输入格式有误");
                        Console.Write("第" + (list.Count + 1) + "组数据为：");
                    }
                  
                }

            }

        }
    }
}