Add linkedlist_deque for typescript and javascript (#326)
* add linkedlist_deque for typescript and javascript * update typescript and javascript examples for the deque.md * keep the same name * update the doc * Update deque.md --------- Co-authored-by: steak-zhuo <zhuoqinyue@gmail.com> Co-authored-by: Yudong Jin <krahets@163.com>pull/341/head
zhuoqinyue
2 years ago
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c4b510038c
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/**
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* File: linkedlist_deque.js
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* Created Time: 2023-02-04
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* Author: Zhuo Qinyue (1403450829@qq.com)
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*/
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/* 双向链表结点 */
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class ListNode {
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prev; // 前驱结点引用 (指针)
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next; // 后继结点引用 (指针)
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val; // 结点值
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constructor(val) {
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this.val = val;
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this.next = null;
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this.prev = null;
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}
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}
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/* 基于双向链表实现的双向队列 */
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class LinkedListDeque {
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front; // 头结点 front
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rear; // 尾结点 rear
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len; // 双向队列的长度
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constructor() {
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this.front = null;
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this.rear = null;
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this.len = 0;
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}
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/* 队尾入队操作 */
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pushLast(val) {
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const node = new ListNode(val);
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// 若链表为空，则令 front, rear 都指向 node
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if (this.len === 0) {
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this.front = node;
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this.rear = node;
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} else {
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// 将 node 添加至链表尾部
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this.rear.next = node;
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node.prev = this.rear;
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this.rear = node; // 更新尾结点
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}
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this.len++;
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}
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/* 队首入队操作 */
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pushFirst(val) {
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const node = new ListNode(val);
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// 若链表为空，则令 front, rear 都指向 node
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if (this.len === 0) {
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this.front = node;
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this.rear = node;
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} else {
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// 将 node 添加至链表头部
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this.front.prev = node;
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node.next = this.front;
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this.front = node; // 更新头结点
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}
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this.len++;
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}
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/* 队尾出队操作 */
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pollLast() {
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if (this.len === 0) {
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return null;
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}
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const value = this.rear.val; // 存储尾结点值
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// 删除尾结点
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let temp = this.rear.prev;
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if (temp !== null) {
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temp.next = null;
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this.rear.prev = null;
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}
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this.rear = temp; // 更新尾结点
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this.len--;
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return value;
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}
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/* 队首出队操作 */
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pollFirst() {
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if (this.len === 0) {
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return null;
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}
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const value = this.front.val; // 存储尾结点值
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// 删除头结点
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let temp = this.front.next;
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if (temp !== null) {
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temp.prev = null;
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this.front.next = null;
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}
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this.front = temp; // 更新头结点
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this.len--;
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return value;
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}
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/* 访问队尾元素 */
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peekLast() {
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return this.len === 0 ? null : this.rear.val;
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}
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/* 访问队首元素 */
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peekFirst() {
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return this.len === 0 ? null : this.front.val;
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}
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/* 获取双向队列的长度 */
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size() {
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return this.len;
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}
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/* 判断双向队列是否为空 */
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isEmpty() {
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return this.len === 0;
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}
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/* 打印双向队列 */
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print() {
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const arr = [];
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let temp = this.front;
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while (temp !== null) {
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arr.push(temp.val);
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temp = temp.next;
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}
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console.log("[" + arr.join(", ") + "]");
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}
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}
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/* 初始化双向队列 */
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const linkedListDeque = new LinkedListDeque();
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linkedListDeque.pushLast(3);
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linkedListDeque.pushLast(2);
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linkedListDeque.pushLast(5);
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console.log("双向队列 linkedListDeque = ");
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linkedListDeque.print();
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/* 访问元素 */
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const peekFirst = linkedListDeque.peekFirst();
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console.log("队首元素 peekFirst = " + peekFirst);
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const peekLast = linkedListDeque.peekLast();
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console.log("队尾元素 peekLast = " + peekLast);
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/* 元素入队 */
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linkedListDeque.pushLast(4);
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console.log("元素 4 队尾入队后 linkedListDeque = ");
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linkedListDeque.print();
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linkedListDeque.pushFirst(1);
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console.log("元素 1 队首入队后 linkedListDeque = ");
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linkedListDeque.print();
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/* 元素出队 */
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const pollLast = linkedListDeque.pollLast();
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console.log("队尾出队元素 = " + pollLast + "，队尾出队后 linkedListDeque = ");
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linkedListDeque.print();
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const pollFirst = linkedListDeque.pollFirst();
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console.log("队首出队元素 = " + pollFirst + "，队首出队后 linkedListDeque = ");
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linkedListDeque.print();
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/* 获取双向队列的长度 */
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const size = linkedListDeque.size();
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console.log("双向队列长度 size = " + size);
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/* 判断双向队列是否为空 */
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const isEmpty = linkedListDeque.isEmpty();
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console.log("双向队列是否为空 = " + isEmpty);
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@ -0,0 +1,166 @@
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/**
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* File: linkedlist_deque.ts
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* Created Time: 2023-02-04
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* Author: Zhuo Qinyue (1403450829@qq.com)
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*/
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/* 双向链表结点 */
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class ListNode {
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prev: ListNode; // 前驱结点引用 (指针)
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next: ListNode; // 后继结点引用 (指针)
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val: number; // 结点值
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constructor(val: number) {
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this.val = val;
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this.next = null;
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this.prev = null;
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}
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}
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/* 基于双向链表实现的双向队列 */
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class LinkedListDeque {
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front: ListNode; // 头结点 front
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rear: ListNode; // 尾结点 rear
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len: number; // 双向队列的长度
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constructor() {
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this.front = null;
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this.rear = null;
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this.len = 0;
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}
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/* 队尾入队操作 */
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pushLast(val: number): void {
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const node: ListNode = new ListNode(val);
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// 若链表为空，则令 front, rear 都指向 node
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if (this.len === 0) {
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this.front = node;
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this.rear = node;
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} else {
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// 将 node 添加至链表尾部
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this.rear.next = node;
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node.prev = this.rear;
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this.rear = node; // 更新尾结点
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}
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this.len++;
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}
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/* 队首入队操作 */
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pushFirst(val: number): void {
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const node: ListNode = new ListNode(val);
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// 若链表为空，则令 front, rear 都指向 node
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if (this.len === 0) {
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this.front = node;
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this.rear = node;
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} else {
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// 将 node 添加至链表头部
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this.front.prev = node;
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node.next = this.front;
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this.front = node; // 更新头结点
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}
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this.len++;
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}
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/* 队尾出队操作 */
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pollLast(): number {
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if (this.len === 0) {
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return null;
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}
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const value: number = this.rear.val; // 存储尾结点值
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// 删除尾结点
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let temp: ListNode = this.rear.prev;
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if (temp !== null) {
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temp.next = null;
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this.rear.prev = null;
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}
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this.rear = temp; // 更新尾结点
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this.len--;
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return value;
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}
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/* 队首出队操作 */
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pollFirst(): number {
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if (this.len === 0) {
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return null;
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}
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const value: number = this.front.val; // 存储尾结点值
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// 删除头结点
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let temp: ListNode = this.front.next;
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if (temp !== null) {
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temp.prev = null;
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this.front.next = null;
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}
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this.front = temp; // 更新头结点
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this.len--;
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return value;
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}
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/* 访问队尾元素 */
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peekLast(): number {
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return this.len === 0 ? null : this.rear.val;
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}
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/* 访问队首元素 */
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peekFirst(): number {
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return this.len === 0 ? null : this.front.val;
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}
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/* 获取双向队列的长度 */
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size(): number {
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return this.len;
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}
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/* 判断双向队列是否为空 */
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isEmpty(): boolean {
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return this.len === 0;
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}
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/* 打印双向队列 */
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print(): void {
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const arr: number[] = [];
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let temp: ListNode = this.front;
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while (temp !== null) {
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arr.push(temp.val);
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temp = temp.next;
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}
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console.log("[" + arr.join(", ") + "]");
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}
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}
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/* 初始化双向队列 */
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const linkedListDeque: LinkedListDeque = new LinkedListDeque();
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linkedListDeque.pushLast(3);
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linkedListDeque.pushLast(2);
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linkedListDeque.pushLast(5);
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console.log("双向队列 linkedListDeque = ");
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linkedListDeque.print();
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/* 访问元素 */
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const peekFirst: number = linkedListDeque.peekFirst();
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console.log("队首元素 peekFirst = " + peekFirst);
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const peekLast: number = linkedListDeque.peekLast();
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console.log("队尾元素 peekLast = " + peekLast);
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/* 元素入队 */
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linkedListDeque.pushLast(4);
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console.log("元素 4 队尾入队后 linkedListDeque = ");
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linkedListDeque.print();
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linkedListDeque.pushFirst(1);
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console.log("元素 1 队首入队后 linkedListDeque = ");
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linkedListDeque.print();
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/* 元素出队 */
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const pollLast: number = linkedListDeque.pollLast();
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console.log("队尾出队元素 = " + pollLast + "，队尾出队后 linkedListDeque = ");
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linkedListDeque.print();
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const pollFirst: number = linkedListDeque.pollFirst();
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console.log("队首出队元素 = " + pollFirst + "，队首出队后 linkedListDeque = ");
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linkedListDeque.print();
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/* 获取双向队列的长度 */
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const size: number = linkedListDeque.size();
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console.log("双向队列长度 size = " + size);
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/* 判断双向队列是否为空 */
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const isEmpty: boolean = linkedListDeque.isEmpty();
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console.log("双向队列是否为空 = " + isEmpty);
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