Problem 1000 to 1002

using System;
//Input integer number A,B,output A+B.
    class Program
    {
        static void Main(string[] args)
        {
            string[] s = Console.ReadLine().Split();
            Console.WriteLine("{0}", Convert.ToInt16(s[0]) + Convert.ToInt16(s[1]));
        }
    }

using System;

namespace Q1001
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = Console.In.ReadToEnd().Trim();
            char[] divide={‘\r‘,‘\t‘,‘ ‘,‘\n‘,‘\v‘};
            string[] s=str.Split(divide,StringSplitOptions.RemoveEmptyEntries);
            for(int i=s.Length-1;i>=0;i--)
                Console.WriteLine("{0:F4}",Math.Sqrt(Convert.ToDouble(s[i])));
            Console.ReadKey();
        }
    }
}

using System;
using System.Text.RegularExpressions;

namespace Q1001
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] nums = Regex.Split(Console.In.ReadToEnd().Trim(),@"\s+");
            //等价于Regex reg=@"\s+";  reg.Split(Console.In.ReadToEnd.Trim());
            for (int i = nums.Length - 1; i >= 0; i--)
                Console.WriteLine("{0:F4}", Math.Sqrt(ulong.Parse(nums[i])));
            Console.ReadKey();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;

namespace Q1002_modify
{
    class Program
    {
        static void Main(string[] args)
        {
            Start(Console.In, Console.Out);
        }

        static void Start(TextReader reader,TextWriter writer)
        {
            while(true)
            {
                string phonenum = reader.ReadLine();
                if (phonenum == "-1")
                    break;
                int num=Int16.Parse(Console.ReadLine());
                string[] words=new string[num];
                string[] number=new string[num];
                for(int i=0;i<num;i++)
                {
                    words[i] = Console.ReadLine();
                    number[i] = WordToNum(words[i]);
                }
                int[] result = GetMatchIndex(phonenum, number);
                if (result != null)
                {
                    foreach (int a in result)
                        Console.Write("{0} ", words[a]);
                    Console.WriteLine();
                }
                else
                    Console.WriteLine("No solution.");
            }
        }

        //将字母转换为数字
        static string WordToNum(string word)
        {
            //使与字母相对应的数字恰好为数组的下标
            string[] phonenum = { "oqz", "ij", "abc", "def", "gh", "kl", "mn", "prs", "tuv", "wxy" };
            int[] num = new int[word.Length];
            int pos = 0;
            foreach (char s in word)  //将字母转换为数字
            {
                for (int i = 0; i < phonenum.Length; i++)
                {
                    if (phonenum[i].Contains(s))
                    {
                        num[pos] = i;
                        pos++;
                        break;
                    }
                }
            }
            //将数字变为字符串形式---后续所需
            string number = null;
            for (int i = 0; i < num.Length; i++)
                number+= num[i].ToString();
            return number;
        }
        //用于记录字符长度和起始位置
        struct Range
        {
            public int Length;
            public int First;
        }

        //检测单词对应的数字组合起来是否与号码相对应
        static int[] GetMatchIndex(string phonenum,string[] words)
        {   
            //记录字符串匹配开始位置
            bool[] match = new bool[phonenum.Length + 2];
            match[1] = true;
            Range[] list = new Range[match.Length];
            for (int i = 1; i < list.Length; i++)
                list[i].Length = phonenum.Length + 1;   
            for (int i = 1; i <= phonenum.Length; i++)  //从phonenum初始端一直往下寻找
            {
                if (!match[i])  //确定开始首字母位置
                    continue;       
                for (int j = 0; j < words.Length; j++)  
                {
                    int n = words[j].Length;
                    //当单词长度超过剩余匹配长度及该字符串非此号码的子字符串时直接跳出该次循环
                    if (phonenum.Length - i + 1 < n || words[j] != phonenum.Substring(i - 1, n))
                        continue;
                    match[i + n] = true; //指定下一个开始的位置
                    if (list[i + n - 1].Length <= list[i - 1].Length + 1)
                        continue;
                    list[i + n - 1].Length = list[i - 1].Length + 1; //记录单词个数
                    list[i + n - 1].First = j; //标明了符合的子字符串在phonenum中的位置
                }
            }
            int k = phonenum.Length;
            if (list[k].Length > k)
                return null;
            int[] idxs = new int[list[k].Length];
            for (int i = idxs.Length - 1; i >= 0; k -= words[idxs[i]].Length, i--)
                idxs[i] = list[k].First;
            return idxs;
        }
    }
}

string WordToNumber(string word)
        {
            char[] number = new char[word.Length];
            for (int i = 0; i < word.Length; i++) 
                number[i] = TheDictionary[word[i]];
            return new string(number);
        }

        Dictionary<char, char> theDictionary = null;

        Dictionary<char, char> TheDictionary
        {
            get
            {
                if (theDictionary == null)
                {
                    theDictionary = new Dictionary<char, char>();
                    for (int i = 0; i < 26; i++)
                        theDictionary.Add((char)(‘a‘ + i), "22233344115566070778889990"[i]);
                }
                return theDictionary;
            }
        }