design_hashmap

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706. Design HashMap (Easy)

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

To be specific, your design should include these functions:

• put(key, value) : Insert a (key, value) pair into the HashMap. If the value already exists in the HashMap, update the value.
• get(key): Returns the value to which the specified key is mapped, or -1 if this map contains no mapping for the key.
• remove(key) : Remove the mapping for the value key if this map contains the mapping for the key.

Example:

MyHashMap hashMap = new MyHashMap();
hashMap.put(1, 1);          
hashMap.put(2, 2);         
hashMap.get(1);            // returns 1
hashMap.get(3);            // returns -1 (not found)
hashMap.put(2, 1);          // update the existing value
hashMap.get(2);            // returns 1 
hashMap.remove(2);          // remove the mapping for 2
hashMap.get(2);            // returns -1 (not found) 

Note:

• All keys and 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 HashMap library.

Related Topics

[Design] [Hash Table]

Similar Questions

1. Design HashSet (Easy)

Documentation

Index

• type MyHashMap
  • func Constructor() MyHashMap
  • func (this *MyHashMap) Get(key int) int
  • func (this *MyHashMap) Put(key int, value int)
  • func (this *MyHashMap) Remove(key int)

Types

type MyHashMap

type MyHashMap struct {
	// contains filtered or unexported fields
}

func Constructor

func Constructor() MyHashMap

* Initialize your data structure here.

func (*MyHashMap) Get

func (this *MyHashMap) Get(key int) int

* Returns the value to which the specified key is mapped, or -1 if this map contains no mapping for the key

func (*MyHashMap) Put

func (this *MyHashMap) Put(key int, value int)

* value will always be non-negative.

func (*MyHashMap) Remove

func (this *MyHashMap) Remove(key int)

* Removes the mapping of the specified value key if this map contains a mapping for the key