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 list = new LinkedList();
            StreamReader sr = new StreamReader(@"144047638844506.txt", Encoding.Default);

            String str = "";
            while ((str = sr.ReadLine()) != null)
            {
                list.AddLast(str);
            }
            LinkedList pList = new LinkedList();
            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 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;
        }
    }
}

18 1
3 38
21 63
64 81
95 19
46 31
29 74
24 31
39 66
34 13
55 59
3 67
54 18
52 91
81 30
76 50
82 30
87 3
93 3
83 39
21 28
69 49
54 44
79 92
61 13
56 15
23 10
34 28
28 85
19 60
66 94
61 47
75 48
49 67
2 83
6 22
63 26
22 16
22 1
59 82
65 14
49 87
24 82
14 3
18 84
62 83
29 22
29 4
21 30
70 22
12 27
95 74
53 17
89 26
69 47
59 33
13 7
71 88
88 36
90 5
72 3
39 100
76 68
3 49
97 73
22 8
51 17
34 3
85 74
80 53
73 39
37 85
45 59
24 85
94 65
41 65
67 80
17 94
47 19
42 95
43 64
54 94
32 87
48 16
13 28
20 85
18 56
21 14
14 44
98 59
8 39
76 26
18 92
19 16
10 13
62 53
28 15
46 59
54 93
26 66
72 45
50 89
52 70
3 65
65 52
23 24
42 98
49 11
41 19
26 51
31 87
55 58
54 100
68 7
44 93
72 68
89 73
56 40
94 10
56 58
62 31
33 3
28 81
66 69
99 91
71 82
30 25
39 35
76 7
41 71
51 64
38 92
36 94
31 29
55 39
38 68
69 70
23 48
2 88
68 100
30 38
33 59
14 72
45 89
30 85
60 32
48 97
23 35
42 6
63 49
44 52
16 12
21 38
11 22
25 79
74 55
16 6
65 82
29 10
70 58
46 81
42 46
30 64
80 23
21 43
71 16
94 87
79 67
76 90
88 53
68 13
59 35
19 75
16 99
36 38
57 82
18 50
79 99
65 58
22 86
52 44
1 46
82 80
64 10
69 51
62 88
16 20
22 34
46 90
32 82
27 40
15 96
41 93
47 6
50 20
91 2
63 43
99 97
74 62
6 94
64 67
81 79
38 55
64 35
44 48
16 22
39 30
17 80
74 63
37 24
82 27
77 97
21 75
45 95
88 50
88 3
68 21
82 57
75 97
91 18
96 7
39 35
88 7
66 62
22 2
37 55
80 65
3 100
91 47
46 78
96 86
80 63
6 13
71 80
97 57
20 87
43 7
45 60
20 66
61 8
21 92
72 23
44 14
70 89
91 17
74 23
32 79
87 2
10 48
63 58
5 34
44 99
93 41
59 12
6 19
72 78
63 95
53 6
9 74
46 51
42 72
2 60
27 12
59 41
69 15
75 65
14 67
5 72
30 62
42 1
92 4
61 56
69 59
6 62
30 31
35 31
90 61
94 100
1 63
15 27
79 28
93 35
99 23
96 92
23 39
96 70
34 8
77 54
66 83
16 95
13 2
78 54
14 23
53 66
37 19
93 15
46 85
49 96
7 97
88 82
87 35
3 73
42 80
26 8
14 93
54 78
46 83
31 59
6 35
77 94
54 69
9 51
53 9
47 12
57 34
45 44
68 47
16 61
78 93
20 91
38 74
68 83
8 50
42 65
37 18
59 42
38 67
44 42
27 90
53 36
75 49
79 94
96 46
55 25
90 74
16 27
99 35
10 7
37 3
23 25
72 81
66 9
99 9
50 78
51 55
13 25
3 43
71 50
88 25
75 29
98 42
56 49
28 17
7 64
19 29
88 90
10 5
50 8
66 99
85 16
53 49
92 8
91 62
57 30
38 83
59 88
76 66
36 4
82 42
67 100
70 7
41 31
11 90
91 28
40 27
43 45
76 87
52 66
100 60
96 38
43 6
25 18
71 12
73 52
53 40
3 74
98 43
5 60
84 95
88 23
21 82
67 96
68 18
14 20
30 61
57 24
66 33
93 36
44 66
87 96
5 41
21 54
83 25
13 66
19 100
40 92
82 7
39 1
76 4
20 5
64 28
80 29
60 73
16 3
38 54
50 94
94 71
47 28
95 59
45 66
11 85
9 92
43 99
44 18
3 16
75 66
43 54
47 3
78 62
57 15
68 7
60 61
29 58
89 75
17 33
92 79
17 52
22 59
51 65
29 53
80 55
70 75
60 68
77 38
82 85
52 49
43 64
9 71
21 49
98 89
82 89
67 50
41 88
61 43
5 89
47 36
43 68
10 54
36 38
91 17
23 95
58 25
88 78
74 37
19 7
77 85
56 17
25 16
11 81
56 57
68 50
25 30
4 12
67 46
80 41
40 96
58 97
20 97
27 45
33 45
51 9
81 59
78 57
26 88
89 34
97 57
35 73
86 38
84 4
84 63
45 75
58 54
24 29
26 34
46 76
42 78
86 71
87 12
11 75
97 7
83 31
31 68
21 14
24 4
28 68
30 37
21 53
65 22
2 90
55 99
18 48
29 55
19 15
18 81
41 14
39 24
45 69
43 65
34 18
20 61
85 49
97 57
54 13
30 7
55 84
6 24
32 86
78 2
52 96
82 92
9 72
67 5
40 62
21 73
79 92
85 16
93 33
24 46
97 54
52 51
37 9
26 20
94 4
73 45
51 6
89 11
77 55
68 88
40 47
80 76
14 72
8 37
17 57
90 20
59 79
29 85
50 22
88 23
19 38
28 7
48 57
13 15
24 81
3 64
79 34
91 92
5 51
80 73
7 22
92 65
100 20
49 1
94 88
23 12
25 3
18 25
59 82
91 34
62 93
97 92
78 40
83 82
90 15
6 96
36 50
12 87
21 61
87 14
48 62
77 25
64 46
1 74
28 91
7 89
36 56
81 13
95 15
47 36
81 52
31 16
1 42
54 74
54 41
87 54
2 16
30 17
61 30
90 88
72 48
29 7
3 61
72 49
27 18
84 8
21 66
75 74
60 29
47 65
21 33
18 22
48 99
38 61
28 79
48 52
78 28
58 81
40 81
81 67
98 17
26 19
34 100
92 93
80 38
58 100
22 27
73 22
26 62
82 5
92 81
8 70
61 18
2 100
98 82
66 96
50 43
66 84
43 57
76 74
46 85
74 19
64 98
40 41
60 73
97 51
6 5
20 66
22 21
17 19
55 35
66 4
77 31
87 19
39 15
45 84
51 18
3 14
67 94
6 26
67 3
29 24
59 100
41 80
21 57
50 27
91 68
30 68
98 69
38 89
83 82
72 33
51 26
99 18
20 4
95 38
58 23
61 16
23 1
47 95
9 97
21 100
64 2
19 13
70 56
1 52
90 25
37 92
50 35
9 21
90 56
10 48
78 22
63 52
74 10
46 83
58 18
34 21
20 52
85 89
59 86
93 48
10 81
92 11
67 52
32 56
7 93
3 37
15 66
27 86
70 84
4 22
6 40
63 65
25 7
64 86
87 55
97 53
7 80
60 13
24 63
49 38
80 37
26 6
74 47
89 76
2 44
50 7
83 12
71 60
70 35
97 8
41 45
12 47
76 71
12 100
85 60
37 64
48 14
61 9
49 14
4 98
20 39
61 43
50 30
29 46
89 69
91 100
16 66
70 27
65 7
38 54
70 38
67 91
58 79
51 58
92 55
55 12
45 15
54 94
96 82
39 84
2 29
83 17
47 5
95 11
11 85
64 32
22 31
22 31
61 25
89 53
79 95
64 23
10 69
68 57
2 6
41 3
87 75
72 33
31 66
95 93
2 59
25 23
41 98
6 1
22 94
5 52
88 68
26 49
88 93
58 89
51 50
92 37
24 63
69 7
80 15
99 82
25 75
56 17
25 61
18 46
6 74
50 46
42 75
46 29
20 3
52 61
6 28
75 26
86 54
40 84
87 65
11 95
81 35
55 50
32 13
24 81
58 17
8 55
97 27
58 66
96 61
78 53
40 52
30 25
58 69
61 96
85 71
90 18
57 45
19 88
9 42
69 18
10 76
72 7
54 81
24 49
94 2
53 33
5 82
58 62
2 70
58 87
92 99
56 48
43 74
35 3
16 55
20 77
82 44
24 59
35 69
12 39
2 16
20 11
30 22
32 39
60 23
37 15
70 32
88 56
34 55
63 6
84 96
49 18
83 24
76 17
93 39
56 46
55 27
8 36
48 39
74 59
13 10
25 34
41 13
89 27
19 3
32 2
99 32
20 81
55 47
49 99
86 56
96 92
83 3
27 82
93 100
93 57
61 17
90 54
81 31
80 100
33 11
53 83
42 24
15 48
71 16
47 8
71 94
51 5
49 77
87 41
28 79
50 40
95 39
93 28
69 72
27 54
34 31
88 27
75 77
70 73
84 40
66 86
45 14
14 83
7 41
13 56
32 59
94 25
86 15
48 64
20 34
95 7
60 49
61 86
25 82
58 60
22 76
45 18
89 58
52 47
50 64
2 81
22 48
57 8
14 57
23 33
90 17
91 1
17 4
87 41
85 44
52 58
19 96
27 60
5 78
93 60
87 15
7 95
74 72
3 96
4 44
65 46
45 81
49 31
74 86
74 25
43 45
73 22
56 77
99 61
83 44
72 21
10 78
67 83
49 70
30 4
13 46
50 9
27 50
39 52
35 65
76 30
9 48
51 16
77 1