统计不连通子图个数

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

namespace ConsoleApplication3
{
    class Program
    {
        public static void Main()
        {
            m3();
        }

        public static void m3()
        {
            LinkedList<String> list = new LinkedList<String>();
            StreamReader sr = new StreamReader(@"144047638844506.txt", Encoding.Default);

            String str = "";
            while ((str = sr.ReadLine()) != null)
            {
                list.AddLast(str);
            }
            LinkedList<People> pList = new LinkedList<People>();
            String[] strs;
            int id;
            int friendId;
            while (list.Count != 0)
            {
                str = list.First();
                list.RemoveFirst();
                strs = str.Split(' ');
                id = int.Parse(strs[0]);
                friendId = int.Parse(strs[1]);
                People root = new People(id, friendId);
                find(root, list);
                pList.AddLast(root);
            }
            Console.WriteLine(pList.Count);
            Console.Read();
        }

        public static void find(People p, LinkedList<String> list)
        {
            String str = "";
            int pId;
            int pFriendId;
            for (int i = 0; i < list.Count; i++)
            {
                str = list.First();
                list.RemoveFirst();
                pId = int.Parse(str.Split(' ')[0]);
                pFriendId = int.Parse(str.Split(' ')[1]);
                if (pId == p.getId())
                {
                    p.addFriend(pFriendId);
                }
                else if (pFriendId == p.getId())
                {
                    p.addFriend(pId);
                }
                else
                {
                    list.AddLast(str);
                }
            }
            if (p.hasFriend())
            {

                foreach (People lp in p.getFriends())
                {
                    find(lp, list);
                }
            }
        }
    }
}

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

namespace ConsoleApplication3
{
    class People
    {
        private int id;
        private People[] friends;
        public People()
        {
        }

        public People(int id)
        {
            this.id = id;
        }

        public People(int id, int friends)
        {
            this.id = id;
            if (friends > 0)
            {
                this.friends = new People[1];
                this.friends[0] = new People(friends);
            }
        }

        public int getId()
        {
            return id;
        }

        public void setId(int id)
        {
            this.id = id;
        }

        public People[] getFriends()
        {
            return friends;
        }

        public void setFriends(People[] friends)
        {
            this.friends = friends;
        }

        public void addFriend(int friendId)
        {
            if (this.friends == null || this.friends.Length <= 0)
            {
                this.friends = new People[] { new People(friendId) };
            }
            else
            {
                People[] dest = new People[this.friends.Length + 1];
                Array.Copy(this.friends, 0, dest, 0, this.friends.Length);
                dest[dest.Length - 1] = new People(friendId);
                this.friends = dest;
            }
        }

        public bool hasFriend()
        {
            return this.friends != null && this.friends.Length != 0;
        }
        public String toString()
        {
            return "People [id=" + id + ", friends=" + friends.Length;
        }
    }
}

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