YURA

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

namespace Objects11
{
    class Program
    {
        static void Main(string[] args)
        {

            var ht = new MyHashTable<int, string>(11);
            ht.Put(23, "aaaa");
            ht.Put(13, "bbb");
            ht.Put(2342, "cccc");

            var v = ht.Get(13);
            Console.WriteLine(v);

            var count = ht.Count;
            Console.WriteLine(count);

            var empty = ht.IsEmpty;
            Console.WriteLine(empty);

            var keys = ht.Keys;
            Console.WriteLine(string.Join(" ", keys));

            Console.ReadLine();
        }
    }

    class MyHashTable<K, V>
    {
        private List<Tuple<K, V>> list;

        public MyHashTable(int capacity)
        {
            list = new List<Tuple<K, V>>(capacity);
            for (int i = 0; i < capacity; i++)
                list.Add(null);
        }

        public void Put(K key, V val)
        {
            var i = GetIndex(key);
            list[i] = new Tuple<K, V>(key, val);
        }

        public V Get(K key)
        {
            var i = GetIndex(key);
            var tuple = list[i];
            if (tuple == null || !tuple.Item1.Equals(key))
                throw new Exception("Key is not found!");

            return tuple.Item2;
        }

        public int Count
        {
            get { return list.Count(t => t != null); }
        }

        public bool IsEmpty
        {
            get { return Count == 0; }
        }

        public IEnumerable<K> Keys
        {
            get { return list.Where(t => t != null).Select(t => t.Item1); }
        }

        int GetIndex(K key)
        {
            return key.GetHashCode() % list.Count;
        }
    }
}