/* 4 Implement the data structure "hash table" in a class HashTable<K,T>. Keep the data in array of
* lists of key-value pairs (LinkedList<KeyValuePair<K,T>>[]) with initial capacity of 16. When the
* hash table load runs over 75%, perform resizing to 2 times larger capacity. Implement the following
* methods and properties: Add(key, value), Find(key)value, Remove( key), Count, Clear(), this[], Keys.
* Try to make the hash table to support iterating over its elements with foreach.
* */
static void Main(string[] args)
{
var ht = new HashTable<string, int>();
foreach (var word in new[] { "aaa", "aaa", "bbb", "ccc", "aaa", "bbb" })
ht.Add(word, 1 + ht.GetOrDefault(word, 0));
Debug.Assert(ht["aaa"] == 3);
Debug.Assert(ht["bbb"] == 2);
Debug.Assert(ht["ccc"] == 1);
var ht2 = new HashTable<MockHash, string>(4);
Debug.Assert(ht2.Count == 0);
Debug.Assert(ht2.OccupiedBuckets == 0);
Debug.Assert(ht2.Capacity == 4);
ht2[new MockHash(0, 0)] = "00";
Debug.Assert(ht2.Count == 1);
Debug.Assert(ht2.OccupiedBuckets == 1);
Debug.Assert(ht2.Capacity == 4);
ht2[new MockHash(0, 1)] = "01";
Debug.Assert(ht2.Count == 2);
Debug.Assert(ht2.OccupiedBuckets == 1);
Debug.Assert(ht2.Capacity == 4);
ht2[new MockHash(1, 2)] = "12";
Debug.Assert(ht2.Count == 3);
Debug.Assert(ht2.OccupiedBuckets == 2);
Debug.Assert(ht2.Capacity == 8);
ht2[new MockHash(1, 3)] = "13";
Debug.Assert(ht2.Count == 4);
Debug.Assert(ht2.OccupiedBuckets == 2);
Debug.Assert(ht2.Capacity == 8);
Debug.Assert(ht2.Remove(new MockHash(1, 3)));
Debug.Assert(!ht2.Remove(new MockHash(1, 3)));
Debug.Assert(ht2.Count == 3);
Debug.Assert(ht2.OccupiedBuckets == 2);
Debug.Assert(ht2.Capacity == 8);
Debug.Assert(ht2.Remove(new MockHash(1, 2)));
Debug.Assert(!ht2.Remove(new MockHash(1, 2)));
Debug.Assert(ht2.Count == 2);
Debug.Assert(ht2.OccupiedBuckets == 1);
Debug.Assert(ht2.Capacity == 8);
}