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DesignHashMap706.java
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/**
* 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.
*/
public class DesignHashMap706 {
class MyHashMap {
private Integer[] cache = new Integer[1000000];
/** Initialize your data structure here. */
public MyHashMap() {
}
/** value will always be non-negative. */
public void put(int key, int value) {
cache[key] = 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) {
if (cache[key] == null) return -1;
return cache[key];
}
/** Removes the mapping of the specified value key if this map contains a mapping for the key */
public void remove(int key) {
cache[key] = null;
}
}
class MyHashMap2 {
private static final int K = 100000;
private ListNode[] cache = new ListNode[100000];
/** Initialize your data structure here. */
public MyHashMap() {
}
/** value will always be non-negative. */
public void put(int key, int value) {
int k = key % K;
if (cache[k] == null) {
cache[k] = new ListNode(key, value);
} else {
ListNode head = cache[k];
while (true) {
if (head.key == key) {
head.value = value;
return;
}
if (head.next == null) {
ListNode newNode = new ListNode(key, value);
head.next = newNode;
newNode.prev = head;
return;
}
head = head.next;
}
}
}
/** 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) {
int k = key % K;
if (cache[k] == null) return -1;
ListNode head = cache[k];
while (true) {
if (head.key == key) {
return head.value;
}
if (head.next == null) {
return -1;
}
head = head.next;
}
}
/** Removes the mapping of the specified value key if this map contains a mapping for the key */
public void remove(int key) {
int k = key % K;
if (cache[k] == null) return;
ListNode head = cache[k];
while (true) {
if (head.key == key) {
if (head.prev == null) {
cache[k] = head.next;
} else {
if (head.next != null) head.next.prev = head.prev;
head.prev.next = head.next;
}
return;
}
if (head.next == null) {
return;
}
head = head.next;
}
}
class ListNode {
ListNode prev;
ListNode next;
Integer key;
Integer value;
ListNode (int key, int value) {
this.key = key;
this.value = value;
}
}
}
class MyHashMap3 {
private static final int K = 100000;
private TreeNode[] cache = new TreeNode[100000];
/** Initialize your data structure here. */
public MyHashMap() {
}
/** value will always be non-negative. */
public void put(int key, int value) {
int k = key % K;
if (cache[k] == null) {
cache[k] = new TreeNode(key, value);
} else {
TreeNode head = cache[k];
while (true) {
if (head.key == key) {
head.value = value;
return;
}
if (head.key > key) {
if (head.left == null) {
head.left = new TreeNode(key, value);
return;
}
head = head.left;
} else {
if (head.right == null) {
head.right = new TreeNode(key, value);
return;
}
head = head.right;
}
if (head == null) return;
}
}
}
/** 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) {
int k = key % K;
if (cache[k] == null) return -1;
TreeNode head = cache[k];
while (true) {
if (head.key == key) {
return head.value;
}
if (head.key > key) {
if (head.left == null) {
return -1;
}
head = head.left;
} else {
if (head.right == null) {
return -1;
}
head = head.right;
}
if (head == null) return -1;
}
}
/** Removes the mapping of the specified value key if this map contains a mapping for the key */
public void remove(int key) {
int k = key % K;
cache[k] = delete(cache[k], key);
}
private TreeNode delete(TreeNode head, int key) {
if (head == null) return head;
if (key < head.key) {
head.left = delete(head.left, key);
} else if (key > head.key) {
head.right = delete(head.right, key);
} else {
if (head.left == null) {
return head.right;
} else if (head.right == null) {
return head.left;
}
head.key = minValue(head.right);
head.right = delete(head.right, head.key);
}
return head;
}
private int minValue(TreeNode head) {
int minv = head.key;
while (head.left != null) {
minv = head.left.key;
head = head.left;
}
return minv;
}
class TreeNode {
TreeNode left;
TreeNode right;
Integer key;
Integer value;
TreeNode (int key, int value) {
this.key = key;
this.value = value;
}
}
}
/**
* 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);
*/
}