# GeetCode Hub

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

Implement the `MyHashMap` class:

• `MyHashMap()` initializes the object with an empty map.
• `void put(int key, int value)` inserts a `(key, value)` pair into the HashMap. If the `key` already exists in the map, update the corresponding `value`.
• `int get(int key)` returns the `value` to which the specified `key` is mapped, or `-1` if this map contains no mapping for the `key`.
• `void remove(key)` removes the `key` and its corresponding `value` if the map contains the mapping for the `key`.

Example 1:

```Input
["MyHashMap", "put", "put", "get", "get", "put", "get", "remove", "get"]
[[], [1, 1], [2, 2], [1], [3], [2, 1], [2], [2], [2]]
Output
[null, null, null, 1, -1, null, 1, null, -1]

Explanation
MyHashMap myHashMap = new MyHashMap();
myHashMap.put(1, 1); // The map is now [[1,1]]
myHashMap.put(2, 2); // The map is now [[1,1], [2,2]]
myHashMap.get(1);    // return 1, The map is now [[1,1], [2,2]]
myHashMap.get(3);    // return -1 (i.e., not found), The map is now [[1,1], [2,2]]
myHashMap.put(2, 1); // The map is now [[1,1], [2,1]] (i.e., update the existing value)
myHashMap.get(2);    // return 1, The map is now [[1,1], [2,1]]
myHashMap.remove(2); // remove the mapping for 2, The map is now [[1,1]]
myHashMap.get(2);    // return -1 (i.e., not found), The map is now [[1,1]]
```

Constraints:

• `0 <= key, value <= 106`
• At most `104` calls will be made to `put`, `get`, and `remove`.

public class MyHashMap { /** Initialize your data structure here. */ public MyHashMap() { } /** value will always be non-negative. */ public void Put(int key, int value) { } /** Returns the value to which the specified key is mapped, or -1 if this map contains no mapping for the key */ public int Get(int key) { } /** Removes the mapping of the specified value key if this map contains a mapping for the key */ public void Remove(int key) { } } /** * Your MyHashMap object will be instantiated and called as such: * MyHashMap obj = new MyHashMap(); * obj.Put(key,value); * int param_2 = obj.Get(key); * obj.Remove(key); */
Easy
Hard