Design a MyHashSet class without using any built-in hash table libraries and implement the following methods in it:

• void add(key): Inserts the value key into the HashSet.

• bool contains(key): Returns TRUE if the key exists in the HashSet, FALSE otherwise.

• void remove(key): Removes the value key if it exists in the HashSet.

Constraints:

• $0$ $\leq$ key $\leq 10^6$

• At most, $10^4$ ...