705.Design HashSet

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Design a HashSet without using any built-in hash table libraries.

To be specific, your design should include these functions:

• add(value): Insert a value into the HashSet.
• contains(value) : Return whether the value exists in the HashSet or not.
• remove(value): Remove a value in the HashSet. If the value does not exist in the HashSet, do nothing.

Example:

MyHashSet hashSet = new MyHashSet();
hashSet.add(1);
hashSet.add(2);
hashSet.contains(1); // returns true
hashSet.contains(3); // returns false (not found)
hashSet.add(2);
hashSet.contains(2); // returns true
hashSet.remove(2);
hashSet.contains(2); // returns false (already removed)

Note:

• All values will be in the range of [0, 1000000].
• The number of operations will be in the range of [1, 10000].
• Please do not use the built-in HashSet library.

class MyHashSet:    def __init__(self):        """        Initialize your data structure here.        """        self.s = set()    def add(self, key):        """        :type key: int        :rtype: void        """        self.s.add(key)        return    def remove(self, key):        """        :type key: int        :rtype: void        """        self.s.discard(key)        return    def contains(self, key):        """        Returns true if this set contains the specified element        :type key: int        :rtype: bool        """        return key in self.s# Your MyHashSet object will be instantiated and called as such:# obj = MyHashSet()# obj.add(key)# obj.remove(key)# param_3 = obj.contains(key)

705.Design HashSet