r5zYd98c

1using System;
2using System.Collections.Generic;
3using System.Linq;
4using System.Text;
5using System.Threading.Tasks;
6
7namespace Task_2
8{
9    public class Group
10    {
11        public List<string> Mails { get; set; }
12
13        public bool IsEqual(string str)
14        {
15            var same = Mails[0].ToLower();
16            str = str.ToLower();
17
18            if (!str.EndsWith("@gmail.com"))
19            {
20                return same.Equals(str);
21            }
22
23            /*
24                // deleted gmail.com
25                if (same.Length > 10)
26                    same = same.Substring(0, same.Length - 10);
27                if (str.Length > 10)
28                    str = str.Substring(0, str.Length - 10);
29            */
30
31            // all before first +
32            same = same.Split('+')[0];
33            str = str.Split('+')[0];
34
35            // deleted tochki
36            same = same.Replace(".", "");
37            str = str.Replace(".", "");
38
39            return same.Equals(str);
40        }
41
42        public override string ToString()
43        {
44            string str = $"{Mails.Count} ";
45
46            foreach (var s in Mails)
47            {
48                str += s + " ";
49            }
50
51            return str;
52        }
53    }
54
55    class Program
56    {
57        static void Main(string[] args)
58        {
59            bool skip;
60            int k;
61            string str;
62            k = int.Parse(Console.ReadLine());
63
64            List<Group> groups = new List<Group>();
65
66            for (int i = 0; i < k; i++)
67            {
68                skip = false;
69                str = Console.ReadLine();
70
71                foreach (var group in groups)
72                {
73                    if (group.IsEqual(str))
74                    {
75                        group.Mails.Add(str);
76                        skip = true;
77                        break;
78                    }
79                }
80
81                if (skip)
82                    continue;
83
84                // reached code here if no equal group found
85                groups.Add(new Group()
86                {
87                    Mails = new List<string>() { str }
88                });
89            }
90
91            // output
92            Console.WriteLine(groups.Count);
93            foreach (var group in groups)
94            {
95                Console.WriteLine(group.ToString());
96            }
97
98            Console.ReadLine();
99        }
100    }
101}